Arquivo da tag: Inteligência animal

Queen of the corvids: the scientist fighting to save the world’s brainiest birds (The Guardian)

Original article

Professor Nicola Clayton: “Obviously, I’m emotionally attached, so showing people the birds at the moment is very difficult.”
Professor Nicola Clayton: “Obviously, I’m emotionally attached, so showing people the birds at the moment is very difficult.” Illustration: Peter Strain/The Observer
A pioneering research laboratory in Cambridge proves that corvids are delightfully clever. Here, its founder reveals what the crow family has taught her – and her heartbreak at the centre’s closure

Will Coldwell

Sun 19 Jun 2022 14.00 BST

Leo, an 18-year-old rook, is playing mind games. It’s a street-corner classic – cups and balls. Only this time the venue is the Comparative Cognition Laboratory in Madingley, Cambridge, and the ball is a waxworm. Leo – poised, pointy, determined – is perched on a wooden platform eager to place his bet. A wriggling morsel is laid under one of three cups, the cups shuffled. Leo cocks his head and takes a stab. Success! He snatches the waxworm in his beak and retreats to enjoy his prize. Aristotle, a fellow resident donned in a glossy black feather coat, who has been at the aviary almost as long as the lab itself, looks on knowingly.

Watching alongside me is Professor Nicola Clayton, a psychologist who founded the lab 22 years ago, and we are joined by Francesca Cornero, 25, a PhD researcher (and occasional cups and balls technician). Clayton, 59, who is short, with blonde hair, large glasses and is wearing loose, black tango trousers, studies the cognitive abilities of both animals and humans, but is particularly known for her seminal research into the intelligence of corvids (birds in the crow family, which includes rooks, jays, magpies and ravens). Corvids have long proved to be at odds with the “bird-brain” stereotype endured by most feathered creatures and her lab, a cluster of four large aviaries tucked behind a thatched pub, has paved the way for new theories about the evolution and development of intelligence. Thanks to Clayton’s own eclectic tastes, which span consciousness to choreography (her other love, besides birds, is dance), the lab also engenders a curious synthesis of ideas drawn from both science and the arts.

For Clayton, who has hand-reared many of the 25 jays and four rooks that live at the lab herself, the birds are like family. She introduces me to Hoy and Romero, a pair of Eurasian jays, and greets her test subjects with affection. “Hello, sweetpeas,” she says, in a sing-song soprano. “I love you.” Hoy responds by blowing kisses: a squeaky mwah mwah. Many corvids, like parrots, can mimic human speech. One of Clayton’s fondest memories of the lab is when a young Romero said: “I love you,” back. To Clayton, the Comparative Cognition Lab is more than just an aviary, or a place of scientific research. It’s a “corvid palace”. And having presided over it for more than two decades, Clayton, undoubtedly, is its queen.

But all is not well in her kingdom. Last year she learned that the lab would not have its grant renewed by the European Research Council. Her application had been made amid the turmoil of Brexit and Clayton believes she is now among a growing number of academics facing funding complications as a result of the UK’s departure from the EU. The pandemic has only exacerbated the challenge of finding alternative financing. And while the university has supported the lab in the meantime, at the end of July, this money is also due to cease. Without a benefactor, Clayton’s lab is on borrowed time. The corvid palace faces closure. Her clever birds, released or rehomed. A lab that has transformed our understanding of animal cognition – and continues to reveal new secrets – soon may no longer exist. “Obviously, I’m emotionally attached,” she says, looking fondly up at Hoy and Romero, “so showing people the birds at the moment is very difficult.”

‘You wonder what’s going on behind their beady eyes’: Professor Nicola Clayton has run the Comparative Cognition Lab for 22 years.
‘You wonder what’s going on behind their beady eyes’: Professor Nicola Clayton has run the Comparative Cognition Lab for 22 years. Photograph: Nasir Kachroo/Rex/Shutterstock

In many ways, humans have always suspected something was up with corvids. As Clayton puts it: “You wonder what’s going on behind that beady eye, don’t you?” These birds are shrouded in mysticism and intrigue. Corvids feature prominently in folklore, often depicted as prophetic, tricksters, or thieves. Ravens keep the Tower of London from falling down, and we count magpies to glimpse our fortune. In his poem of the same name, Edgar Allan Poe chose a raven – a talking bird – to accompany his narrator’s descent into madness, and few images are quite as ominous as the conspiring flock of crows gathering on a climbing frame in Alfred Hitchcock’s The Birds. The semiotics of corvids are rooted in an innate sense that the birds are intelligent. Here, Clayton has been able to test some of the true reaches of their mental capacities.

One of the big questions for her concerned “mental time travel” – the ability to remember the past or plan for the future. “People assumed this is something that only humans have,” she says. “That animals didn’t have these experiential memories that require us to project the self in time.” Clayton had already found that scrub jays showed evidence of episodic memory – remembering not only where, but when they had hidden food. But, at Madingley, she observed that jays were also capable of thinking about the future. A study conducted with Dr Nathan Emery, a fellow researcher in animal cognition (and her husband), found that a jay with prior experience as a thief was more cautious when hiding its food – if a thieving bird knew it was being watched when it was caching, it would move the food to a new hiding place later. Birds that had not previously stolen food for themselves remained blissfully ignorant. It seemed that jays could not only relate to a previous experience, but put themselves in the eyes of another bird and make decisions based on the possibility of future events. The results of the study were published in Nature in 2001. It was, Clayton says, a “gamechanger”.

Another experiment at the lab conducted by Chris Bird, a PhD student, drew on the rich cultural heritage of corvids for inspiration. Its starting point was Aesop’s fable, The Crow and the Pitcher. The study found that – just like the “clever crow” – rooks were capable of manipulating water by dropping rocks in it until food was raised within reach of its beak. Another experiment found that rooks – which don’t use tools in the natural habitat – could use their creativity to make task-specific tools, such as bending wire into a hook to lever a small bucket out of a tube. “I always had a big respect for birds,” Clayton says. “But I was stunned by how intelligent they were.”

Studies such as these have helped establish that animals which followed a different evolutionary path to humans were in fact capable of intelligent thought – that intelligence evolved independently in separate groups. To Clayton, corvids are as intelligent as chimpanzees, and her research into these “feathered apes” has shaped the thinking of many academics in the field. Henry Gee, an evolutionary biologist and a senior editor at Nature, told me that Clayton has proved that intelligence has nothing much to do with how brains are wired, or even how big they are. “She has shown that corvids are capable of a ‘theory of mind’. They can conceive of themselves as agents in their own lives. They can plot, plan, scheme and even lie, something human beings cannot do until they reach the age of about three. In other words, corvids think very much like we do.”

‘Corvids can plot, plan, scheme and even lie. They think like we do.’
‘Corvids can plot, plan, scheme and even lie. They think like we do.’ Photograph: Arterra Picture Library/Alamy

As news that the lab faces closure has rippled through the scientific community, the reaction has been of sadness and dismay. An open letter signed by 358 academics from around the world has called on the university to reconsider. One signatory, Alex Thornton, a professor of cognitive evolution at Exeter University, said it would represent an act of “scientific vandalism and monumental self-sabotage”. Gee said it showed a “lack of intelligence”. Emery told me that creating something similar somewhere else would be pretty difficult, “if not impossible”, and incredibly expensive. “These birds cannot be purchased ‘off the shelf’,” he said. “If Nicky’s corvid lab closes down, then it couldn’t really start up again.” As the letter states, the lab at Madingley is the only one of its kind in the UK, and remains “globally unique in its size and capability”.

For Jonathan Birch, an associate professor at LSE, it is this years-long approach that makes Clayton’s lab so significant. “I see some big cultural problems in science as it is now, with a focus on the short term,” he told me. “All around the world, not just in Cambridge, this is squeezing out funding for long-term studies. Clayton’s lab shows us a different way of doing animal research: an approach where we see animals for what they are – sentient beings with their own individual lives to lead. And where we study them over the long term to find out how they think and solve problems. The international significance of the lab is hard to overstate. Its closure would be a terrible loss to the sciences of mind and brain.”

In a statement, Cambridge University praised Clayton’s work, but said that continued investment was “not sustainable at a time of rapidly rising costs and when funds could otherwise be allocated to support the research of early- and midcareer academics”. It added that it would be “delighted” to work with an external funder to keep the aviaries open, should one emerge in the next few months. It is hard to put a precise figure on what it would cost to keep the lab open in the long run, but Clayton estimates it could cost £300,000 to £500,000 to secure the birds for another five or six years. She has received some partial offers from potential donors, though nothing has been confirmed.

Clayton’s work remains pivotal in changing how we think about animals. As the New Scientist reported, studies conducted at her lab are “part of a renaissance in our understanding of the cognition of other creatures… but there is still much more to learn”. And to learn from animals in this way is a slow process. These sorts of experiments, says Clayton, require years of preparation. You can’t just teach any old crow new tricks (well, perhaps you can, but it wouldn’t be scientifically valid). The corvids cannot be wild caught, as researchers would not know the prior experiences of the bird. For these sorts of experiments, the birds must be handraised in controlled conditions. It also takes considerable time to build up the trust required to run an experiment. “It’s a privilege,” says Clayton, “to get the opportunity to see inside their minds, and for them to trust us enough to share what they know with us.”

‘It’s a privilege to get the opportunity to see inside their minds, and for them to trust us enough to share what they know with us’: Professor Nicola Clayton.
‘It’s a privilege to get the opportunity to see inside their minds, and for them to trust us enough to share what they know with us’: Professor Nicola Clayton. Photograph: Dan Burn-Forti/The Observer

Cornero, who is researching how rooks understand language, tells me that it took a year before she could start working effectively with Hoy. She has now taught him to respond to a number of verbal commands. When she says, “Come,” he comes. When she says, “Speak,” he mumbles something in corvid. It raises further questions about our assumptions of which animals we consider “smart”; if a rook can be trained much like a dog, then is domestication really a prerequisite to “intelligent” behaviours? “In the context of conservation and the climate disaster,” says Cornero, “I think it’s really important for humans to be increasingly aware that we aren’t the only ones that think and feel and exist in this space.”

If anyone is equipped to bring these ideas into the public consciousness, it’s Clayton. She has always had a knack for creating tantalising work – for nurturing a creative frisson around different ideas, approaches and perspectives. For inspiring new thought. She is the first scientist in residence at the Rambert School of Ballet and Contemporary Dance and has a long-term collaboration with the artist Clive Wilkins, who is a member of the magician’s circle (and her tango partner).

“Magic reveals a lot about the blind spots we have,” says Clayton, and lately magic has opened up a new line of inquiry for the lab. Last year, a study led by Elias Garcia-Pelegrin used magicians’ sleight of hand as a means to test the perceptual abilities of jays. You don’t have to be an evolutionary biologist or an expert in animal cognition to find these experiments alluring.

Much like a magic trick, this research leaves you with more questions than answers, but now Clayton is reluctantly preparing her birds for departure. The younger birds are being readied to be released into the wild. The others have all, thankfully, been found suitable homes; and the rooks may continue their lives at a similar research lab in Strasbourg. Really, Clayton remains hopeful that the lab will find some way to continue its work. Since she could walk, she says, all she ever wanted to do was “dance and watch the birds”. It’s not easy to let go of what she has built here. As we stand in the aviary, listening to Hoy chirp, “What’s that noise?”, I ask her what it really means when a corvid mimics a human phrase, or a jay says, “I love you”. “Well,” says Clayton, “It’s their way of connecting, isn’t it?”

Thousands of Chimp Vocal Recordings Reveal a Hidden Language We Never Knew About (Science Alert)

sciencealert.com

PETER DOCKRILL

24 MAY 2022


A common chimpanzee vocalizing. (Andyworks/Getty Images)

We humans like to think our mastery of language sets us apart from the communication abilities of other animals, but an eye-opening new analysis of chimpanzees might force a rethink on just how unique our powers of speech really are.

In a new study, researchers analyzed almost 5,000 recordings of wild adult chimpanzee calls in Taï National Park in Côte d’Ivoire (aka Ivory Coast).

When they examined the structure of the calls captured on the recordings, they were surprised to find 390 unique vocal sequences – much like different kinds of sentences, assembled from combinations of different call types.

Compared to the virtually endless possibilities of human sentence construction, 390 distinct sequences might not sound overly verbose.

Yet, until now, nobody really knew that non-human primates had so many different things to say to each other – because we’ve never quantified their communication capabilities to such a thorough extent.

“Our findings highlight a vocal communication system in chimpanzees that is much more complex and structured than previously thought,” says animal researcher Tatiana Bortolato from the Max Planck Institute for Evolutionary Anthropology in Germany.

In the study, the researchers wanted to measure how chimpanzees combine single-use calls into sequences, order those calls within the sequences, and recombine independent sequences into even longer sequences.

While call combinations of chimpanzees have been studied before, until now the sequences that make up their whole vocal repertoire had never been subjected to a broad quantitative analysis.

To rectify this, the team captured 900 hours of vocal recordings made by 46 wild mature western chimpanzees (Pan troglodytes verus), belonging to three different chimp communities in Taï National Park.

In analyzing the vocalizations, the researchers identified how vocal calls could be uttered singularly, combined in two-unit sequences (bigrams), or three-unit sequences (trigrams). They also mapped networks of how these utterances were combined, as well as examining how different kinds of frequent vocalizations were ordered and recombined (for example, bigrams within trigrams).

In total, 12 different call types were identified (including grunts, pants, hoos, barks, screams, and whimpers, among others), which appeared to mean different things, depending on how they were used, but also upon the context in which the communication took place.

“Single grunts, for example, are predominantly emitted at food, whereas panted grunts are predominantly emitted as a submissive greeting vocalization,” the researchers explain in their paper, led by co-first authors Cédric Girard-Buttoz and Emiliano Zaccarella.

“Single hoos are emitted to threats, but panted hoos are used in inter-party communication.”

In total, the researchers found these different kinds of calls could be combined in various ways to make up 390 different kinds of sequences, which they say may actually be an underestimation, given new vocalization sequences were still being found as the researchers hit their limit of field recordings.

Even so, the data so far suggest chimpanzee communication is much more complex than we realized, which has implications for the sophistication of meanings generated in their utterances (as well as giving new clues into the origins of human language).

“The chimpanzee vocal system, consisting of 12 call types used flexibly as single units, or within bigrams, trigrams or longer sequences, offers the potential to encode hundreds of different meanings,” the researchers write.

“Whilst this possibility is substantially less than the infinite number of different meanings that can be generated by human language, it nonetheless offers a structure that goes beyond that traditionally considered likely in primate systems.”

The next step, the team says, will be to record even larger datasets of chimpanzee calls, to try to assess just how the diversity and ordering of uttered sequences relates to versatile meaning generation, which wasn’t considered in this study.

There’s lots more to be said, in other words – by both chimpanzees and scientists alike.

“This is the first study in a larger project,” explains senior author Catherine Crockford, a director of research at the Institute for Cognitive Science at CNRS, in France.

“By studying the rich complexity of the vocal sequences of wild chimpanzees, a socially complex species like humans, we expect to bring fresh insight into understanding where we come from and how our unique language evolved.”

The findings are reported in Communications Biology.

Orangutans instinctively use hammers to strike and sharp stones to cut, study finds (Science Daily)

Untrained, captive orangutans complete major steps in making and using stone tools

Date: February 16, 2022

Source: PLOS

Summary: Untrained, captive orangutans can complete two major steps in the sequence of stone tool use: striking rocks together and cutting using a sharp stone, according to a new study.


Untrained, captive orangutans can complete two major steps in the sequence of stone tool use: striking rocks together and cutting using a sharp stone, according to a study by Alba Motes-Rodrigo at the University of Tübingen in Germany and colleagues, publishing February 16 in the open-access journal PLOS ONE.

The researchers tested tool making and use in two captive male orangutans (Pongo pygmaeus) at Kristiansand Zoo in Norway. Neither had previously been trained or exposed to demonstrations of the target behaviors. Each orangutan was provided with a concrete hammer, a prepared stone core, and two baited puzzle boxes requiring them to cut through a rope or a silicon skin in order to access a food reward. Both orangutans spontaneously hit the hammer against the walls and floor of their enclosure, but neither directed strikes towards the stone core. In a second experiment, the orangutans were also given a human-made sharp flint flake, which one orangutan used to cut the silicon skin, solving the puzzle. This is the first demonstration of cutting behavior in untrained, unenculturated orangutans.

To then investigate whether apes could learn the remaining steps from observing others, the researchers demonstrated how to strike the core to create a flint flake to three female orangutans at Twycross Zoo in the UK. After these demonstrations, one female went on to use the hammer to hit the core, directing the blows towards the edge as demonstrated.

This study is the first to report spontaneous stone tool use without close direction in orangutans that have not been enculturated by humans. The authors say their observations suggest that two major prerequisites for the emergence of stone tool use — striking with stone hammers and recognizing sharp stones as cutting tools — may have existed in our last common ancestor with orangutans, 13 million years ago.

The authors add: “Our study is the first to report that untrained orangutans can spontaneously use sharp stones as cutting tools. We also found that they readily engage in lithic percussion and that this activity occasionally leads to the detachment of sharp stone pieces.”



Journal Reference:

  1. Alba Motes-Rodrigo, Shannon P. McPherron, Will Archer, R. Adriana Hernandez-Aguilar, Claudio Tennie. Experimental investigation of orangutans’ lithic percussive and sharp stone tool behaviours. PLOS ONE, 2022; 17 (2): e0263343 DOI: 10.1371/journal.pone.0263343

Flies possess more sophisticated cognitive abilities than previously known (Science Daily)

Immersive virtual reality and real-time brain activity imaging showcase Drosophila’s capabilities of attention, working memory and awareness

Date: February 17, 2022

Source: University of California – San Diego

Summary: Common flies feature more advanced cognitive abilities than previously believed. Using a custom-built immersive virtual reality arena, neurogenetics and real-time brain activity imaging, researchers found attention, working memory and conscious awareness-like capabilities in fruit flies.


Fruit fly (stock image). Credit: © Arif_Vector / stock.adobe.com

As they annoyingly buzz around a batch of bananas in our kitchens, fruit flies appear to have little in common with mammals. But as a model species for science, researchers are discovering increasing similarities between us and the miniscule fruit-loving insects.

In a new study, researchers at the University of California San Diego’s Kavli Institute for Brain and Mind (KIBM) have found that fruit flies (Drosophila melanogaster) have more advanced cognitive abilities than previously believed. Using a custom-built immersive virtual reality environment, neurogenetic manipulations and in vivo real-time brain-activity imaging, the scientists present new evidence Feb. 16 in the journal Nature of the remarkable links between the cognitive abilities of flies and mammals.

The multi-tiered approach of their investigations found attention, working memory and conscious awareness-like capabilities in fruit flies, cognitive abilities typically only tested in mammals. The researchers were able to watch the formation, distractibility and eventual fading of a memory trace in their tiny brains.

“Despite a lack of obvious anatomical similarity, this research speaks to our everyday cognitive functioning — what we pay attention to and how we do it,” said study senior author Ralph Greenspan, a professor in the UC San Diego Division of Biological Sciences and associate director of KIBM. “Since all brains evolved from a common ancestor, we can draw correspondences between fly and mammalian brain regions based on molecular characteristics and how we store our memories.”

To arrive at the heart of their new findings the researchers created an immersive virtual reality environment to test the fly’s behavior via visual stimulation and coupled the displayed imagery with an infra-red laser as an averse heat stimulus. The near 360-degree panoramic arena allowed Drosophila to flap their wings freely while remaining tethered, and with the virtual reality constantly updating based on their wing movement (analyzed in real-time using high-speed machine-vision cameras) it gave the flies the illusion of flying freely in the world. This gave researchers the ability to train and test flies for conditioning tasks by allowing the insect to orient away from an image associated with the negative heat stimulus and towards a second image not associated with heat.

They tested two variants of conditioning, one in which flies were given visual stimulation overlapping in time with the heat (delay conditioning), both ending together, or a second, trace conditioning, by waiting 5 to 20 seconds to deliver the heat after showing and removing the visual stimulation. The intervening time is considered the “trace” interval during which the fly retains a “trace” of the visual stimulus in its brain, a feature indicative of attention, working memory and conscious awareness in mammals.

The researchers also imaged the brain to track calcium activity in real-time using a fluorescent molecule they genetically engineered into their brain cells. This allowed the researchers to record the formation and duration of the fly’s living memory since they saw the trace blinking on and off while being held in the fly’s short-term (working) memory. They also found that a distraction introduced during training — a gentle puff of air — made the visual memory fade more quickly, marking the first time researchers have been able to prove such distractedness in flies and implicating an attentional requirement in memory formation in Drosophila.

“This work demonstrates not only that flies are capable of this higher form of trace conditioning, and that the learning is distractible just like in mammals and humans, but the neural activity underlying these attentional and working memory processes in the fly show remarkable similarity to those in mammals,” said Dhruv Grover, a UC San Diego KIBM research faculty member and lead author of the new study. “This work demonstrates that fruit flies could serve as a powerful model for the study of higher cognitive functions. Simply put, the fly continues to amaze in how smart it really is.”

The scientists also identified the area of the fly’s brain where the memory formed and faded — an area known as the ellipsoid body of the fly’s central complex, a location that corresponds to the cerebral cortex in the human brain.

Further, the research team discovered that the neurochemical dopamine is required for such learning and higher cognitive functions. The data revealed that dopamine reactions increasingly occurred earlier in the learning process, eventually anticipating the coming heat stimulus.

The researchers are now investigating details of how attention is physiologically encoded in the brain. Grover believes the lessons learned from this model system are likely to directly inform our understanding of human cognition strategies and neural disorders that disrupt them, but also contribute to new engineering approaches that lead to performance breakthroughs in artificial intelligence designs.

The coauthors of the study include Dhruv Grover, Jen-Yung Chen, Jiayun Xie, Jinfang Li, Jean-Pierre Changeux and Ralph Greenspan (all affiliated with the UC San Diego Kavli Institute for Brain and Mind, and J.-P. Changeux also a member of the Collège de France).



Journal Reference:

  1. Dhruv Grover, Jen-Yung Chen, Jiayun Xie, Jinfang Li, Jean-Pierre Changeux, Ralph J. Greenspan. Differential mechanisms underlie trace and delay conditioning in Drosophila. Nature, 2022; DOI: 10.1038/s41586-022-04433-6

Chimps Catch Insects to Put on Wounds. Is It Folk Medicine? (New York Times)

nytimes.com

Nicholas Bakalar


Trilobites

They don’t eat the bugs, and they’re definitely applying them to wounds, so some scientists think the primates may be treating one another’s injuries.
Cinemagraph
A chimp, Suzee, catches an insect and puts it on a wound on the foot of her son, Sia. Video by Alessandra Mascaro. Credit: Tobias Deschner

Feb. 7, 2022

A chimp, Suzee, catches an insect and puts it on a wound on the foot of her son, Sia. Video by Alessandra Mascaro. Credit: Tobias Deschner

Chimpanzees design and use tools. That is well known. But is it possible that they also use medicines to treat their own and others’ injuries? A new report suggests they do.

Since 2005, researchers have been studying a community of 45 chimpanzees in the Loango National Park in Gabon, on the west coast of Africa. Over a period of 15 months, from November 2019 to February 2021, the researchers saw 76 open wounds on 22 different chimpanzees. In 19 instances they watched a chimp performing what looked like self-treatment of the wound using an insect as a salve. In a few instances, one chimp appeared to treat another. The scientists published their observations in the journal Current Biology on Monday.

The procedure was similar each time. First, the chimps caught a flying insect; then they immobilized it by squeezing it between their lips. They placed the insect on the wound, moving it around with their fingertips. Finally, they took the insect out, using either their mouths or their fingers. Often, they put the insect in the wound and took it out several times.

The researchers do not know what insect the chimps were using, or precisely how it may help heal a wound. They do know that the bugs are small flying insects, dark in color. There’s no evidence that the chimps are eating the insects — they are definitely squeezing them with their lips and then applying them to the wounds.

There have been other reports of self-medication in animals, including dogs and cats that eat grass or plants, probably to help them vomit, and bears and deer that consume medicinal plants, apparently to self-medicate. Orangutans have been seen applying plant material to soothe muscle injuries. But the researchers know of no previous report of nonhuman mammals using insects for a medicinal purpose.

In three instances, the researchers saw chimps using the technique on another chimp. In one case, they saw an adult female named Carol grooming around a flesh wound on the leg of an adult male, Littlegrey. She grabbed an insect, and gave it to Littlegrey, who put it between his lips, and transferred it to his wound. Later, Carol and another adult male were seen moving the insect around on Littlegrey’s wound. Another adult male approached, took the insect out of the wound, put it between his own lips, then reapplied it to Littlegrey’s leg.

One chimp, an adult male named Freddy, was a particularly enthusiastic user of insect medicine, treating himself numerous times for injuries of his head, both arms, his lower back, his left wrist and his penis. One day, the researchers watched him treat himself twice for the same arm wound. The researchers don’t know how Freddy got these injuries, but some of them probably involved fighting with other males.

There are some animals that cooperate with others in similar ways, said Simone Pika, who leads an animal cognition lab at the University of Osnabrück in Germany and is an author of the study. “But we don’t know of any other instances in mammals,” she said. “This may be a learned behavior that exists only in this group. We don’t know if our chimps are special in this regard.”

Aaron Sandel, an anthropologist at the University of Texas, Austin, found the work valuable, but at the same time expressed some doubts. “They don’t offer an alternative explanation for the behavior, and they make no connection to what insect it might be,” he said. “The jump to a potential medical function? That’s a stretch at this point.”

Still, he said, “attending to their own wounds or the wounds of others using a tool, another object — that’s very rare.” Their documentation of chimps paying such attention to other chimps is, he added, “an important contribution to the study of social behavior in apes. And it’s still interesting to ask whether there is empathy involved in this, as it is in humans.”

In some forms of ape social behavior, it is clear that there is an exchange of value. For example, grooming another chimp provides relief from parasites for the groomed animal, but also an insect snack for the groomer. But in the instances she observed, Dr. Pika said, the chimp gets nothing tangible in return. To her, this shows the apes are engaging in an act that increases “the welfare of another being,” and teaches us more about the primates’ social relationships.

“With every field site we learn more about chimps,” she said. “They really surprise us.”

Becoming a centaur (Aeon)

Rounding up wild horses on the edge of the Gobi desert in Mongolia, 1964. Photo by Philip Jones Griffiths/Magnum
The horse is a prey animal, the human a predator. Our shared trust and athleticism is a neurobiological miracle

Janet Jones – 14 January 2022

Horse-and-human teams perform complex manoeuvres in competitions of all sorts. Together, we can gallop up to obstacles standing 8 feet (2.4 metres) high, leave the ground, and fly blind – neither party able to see over the top until after the leap has been initiated. Adopting a flatter trajectory with greater speed, horse and human sail over broad jumps up to 27 feet (more than 8 metres) long. We run as one at speeds of 44 miles per hour (nearly 70 km/h), the fastest velocity any land mammal carrying a rider can achieve. In freestyle dressage events, we dance in place to the rhythm of music, trot sideways across the centre of an arena with huge leg-crossing steps, and canter in pirouettes with the horse’s front feet circling her hindquarters. Galloping again, the best horse-and-human teams can slide 65 feet (nearly 20 metres) to a halt while resting all their combined weight on the horse’s hind legs. Endurance races over extremely rugged terrain test horses and riders in journeys that traverse up to 500 miles (805 km) of high-risk adventure.

Charlotte Dujardin on Valegro, a world-record dressage freestyle at London Olympia, 2014: an example of high-precision brain-to-brain communication between horse and rider. Every step the horse takes is determined in conjunction with many invisible cues from his human rider, using a feedback loop between predator brain and prey brain. Note the horse’s beautiful physical condition and complete willingness to perform these extremely difficult manoeuvres.

No one disputes the athleticism fuelling these triumphs, but few people comprehend the mutual cross-species interaction that is required to accomplish them. The average horse weighs 1,200 pounds (more than 540 kg), makes instantaneous movements, and can become hysterical in a heartbeat. Even the strongest human is unable to force a horse to do anything she doesn’t want to do. Nor do good riders allow the use of force in training our magnificent animals. Instead, we hold ourselves to the higher standard of motivating horses to cooperate freely with us in achieving the goals of elite sports as well as mundane chores. Under these conditions, the horse trained with kindness, expertise and encouragement is a willing, equal participant in the action.

That action is rooted in embodied perception and the brain. In mounted teams, horses, with prey brains, and humans, with predator brains, share largely invisible signals via mutual body language. These signals are received and transmitted through peripheral nerves leading to each party’s spinal cord. Upon arrival in each brain, they are interpreted, and a learned response is generated. It, too, is transmitted through the spinal cord and nerves. This collaborative neural action forms a feedback loop, allowing communication from brain to brain in real time. Such conversations allow horse and human to achieve their immediate goals in athletic performance and everyday life. In a very real sense, each species’ mind is extended beyond its own skin into the mind of another, with physical interaction becoming a kind of neural dance.

Horses in nature display certain behaviours that tempt observers to wonder whether competitive manoeuvres truly require mutual communication with human riders. For example, the feral horse occasionally hops over a stream to reach good food or scrambles up a slope of granite to escape predators. These manoeuvres might be thought the precursors to jumping or rugged trail riding. If so, we might imagine that the performance horse’s extreme athletic feats are innate, with the rider merely a passenger steering from above. If that were the case, little requirement would exist for real-time communication between horse and human brains.

In fact, though, the feral hop is nothing like the trained leap over a competition jump, usually commenced from short distances at high speed. Today’s Grand Prix jump course comprises about 15 obstacles set at sharp angles to each other, each more than 5 feet high and more than 6 feet wide (1.5 x 1.8 metres). The horse-and-human team must complete this course in 80 or 90 seconds, a time allowance that makes for acute turns, diagonal flight paths and high-speed exits. Comparing the wilderness hop with the show jump is like associating a flintstone with a nuclear bomb. Horses and riders undergo many years of daily training to achieve this level of performance, and their brains share neural impulses throughout each experience.

These examples originate in elite levels of horse sport, but the same sort of interaction occurs in pastures, arenas and on simple trails all over the world. Any horse-and-human team can develop deep bonds of mutual trust, and learn to communicate using body language, knowledge and empathy.

Like it or not, we are the horse’s evolutionary enemy, yet they behave toward us as if inclined to become a friend

The critical component of the horse in nature, and her ability to learn how to interact so precisely with a human rider, is not her physical athleticism but her brain. The first precise magnetic resonance image of a horse’s brain appeared only in 2019, allowing veterinary neurologists far greater insight into the anatomy underlying equine mental function. As this new information is disseminated to horse trainers and riders for practical application, we see the beginnings of a revolution in brain-based horsemanship. Not only will this revolution drive competition to higher summits of success, and animal welfare to more humane levels of understanding, it will also motivate scientists to research the unique compatibility between prey and predator brains. Nowhere else in nature do we see such intense and intimate collaboration between two such disparate minds.

Three natural features of the equine brain are especially important when it comes to mind-melding with humans. First, the horse’s brain provides astounding touch detection. Receptor cells in the horse’s skin and muscles transduce – or convert – external pressure, temperature and body position to neural impulses that the horse’s brain can understand. They accomplish this with exquisite sensitivity: the average horse can detect less pressure against her skin than even a human fingertip can.

Second, horses in nature use body language as a primary medium of daily communication with each other. An alpha mare has only to flick an ear toward a subordinate to get him to move away from her food. A younger subordinate, untutored in the ear flick, receives stronger body language – two flattened ears and a bite that draws blood. The notion of animals in nature as kind, gentle creatures who never hurt each other is a myth.

Third, by nature, the equine brain is a learning machine. Untrammelled by the social and cognitive baggage that human brains carry, horses learn in a rapid, pure form that allows them to be taught the meanings of various human cues that shape equine behaviour in the moment. Taken together, the horse’s exceptional touch sensitivity, natural reliance on body language, and purity of learning form the tripod of support for brain-to-brain communication that is so critical in extreme performance.

One of the reasons for budding scientific fascination with neural horse-and-human communication is the horse’s status as a prey animal. Their brains and bodies evolved to survive completely different pressures than our human physiologies. For example, horse eyes are set on either side of their head for a panoramic view of the world, and their horizontal pupils allow clear sight along the horizon but fuzzy vision above and below. Their eyes rotate to maintain clarity along the horizon when their heads lie sideways to reach grass in odd locations. Equine brains are also hardwired to stream commands directly from the perception of environmental danger to the motor cortex where instant evasion is carried out. All of these features evolved to allow the horse to survive predators.

Conversely, human brains evolved in part for the purpose of predation – hunting, chasing, planning… yes, even killing – with front-facing eyes, superb depth perception, and a prefrontal cortex for strategy and reason. Like it or not, we are the horse’s evolutionary enemy, yet they behave toward us as if inclined to become a friend.

The fact that horses and humans can communicate neurally without the external mediation of language or equipment is critical to our ability to initiate the cellular dance between brains. Saddles and bridles are used for comfort and safety, but bareback and bridleless competitions prove they aren’t necessary for highly trained brain-to-brain communication. Scientific efforts to communicate with predators such as dogs and apes have often been hobbled by the use of artificial media including human speech, sign language or symbolic lexigram. By contrast, horses allow us to apply a medium of communication that is completely natural to their lives in the wild and in captivity.

The horse’s prey brain is designed to notice and evade predators. How ironic, and how riveting, then, that this prey brain is the only one today that shares neural communication with a predator brain. It offers humanity a rare view into a prey animal’s world, almost as if we were wolves riding elk or coyotes mind-melding with cottontail bunnies.

Highly trained horses and riders send and receive neural signals using subtle body language. For example, a rider can apply invisible pressure with her left inner calf muscle to move the horse laterally to the right. That pressure is felt on the horse’s side, in his skin and muscle, via proprioceptive receptor cells that detect body position and movement. Then the signal is transduced from mechanical pressure to electrochemical impulse, and conducted up peripheral nerves to the horse’s spinal cord. Finally, it reaches the somatosensory cortex, the region of the brain responsible for interpreting sensory information.

Riders can sometimes guess that an invisible object exists by detecting subtle equine reactions

This interpretation is dependent on the horse’s knowledge that a particular body signal – for example, inward pressure from a rider’s left calf – is associated with a specific equine behaviour. Horse trainers spend years teaching their mounts these associations. In the present example, the horse has learned that this particular amount of pressure, at this speed and location, under these circumstances, means ‘move sideways to the right’. If the horse is properly trained, his motor cortex causes exactly that movement to occur.

By means of our human motion and position sensors, the rider’s brain now senses that the horse has changed his path rightward. Depending on the manoeuvre our rider plans to complete, she will then execute invisible cues to extend or collect the horse’s stride as he approaches a jump that is now centred in his vision, plant his right hind leg and spin in a tight fast circle, push hard off his hindquarters to chase a cow, or any number of other movements. These cues are combined to form that mutual neural dance, occurring in real time, and dependent on natural body language alone.

The example of a horse moving a few steps rightward off the rider’s left leg is extremely simplistic. When you imagine a horse and rider clearing a puissance wall of 7.5 feet (2.4 metres), think of the countless receptor cells transmitting bodily cues between both brains during approach, flight and exit. That is mutual brain-to-brain communication. Horse and human converse via body language to such an extreme degree that they are able to accomplish amazing acts of understanding and athleticism. Each of their minds has extended into the other’s, sending and receiving signals as if one united brain were controlling both bodies.

Franke Sloothaak on Optiebeurs Golo, a world-record puissance jump at Chaudfontaine in Belgium, 1991. This horse-and-human team displays the gentle encouragement that brain-to-brain communication requires. The horse is in perfect condition and health. The rider offers soft, light hands, and rides in perfect balance with the horse. He carries no whip, never uses his spurs, and employs the gentlest type of bit – whose full acceptance is evidenced by the horse’s foamy mouth and flexible neck. The horse is calm but attentive before and after the leap, showing complete willingness to approach the wall without a whiff of coercion. The first thing the rider does upon landing is pat his equine teammate. He strokes or pats the horse another eight times in the next 30 seconds, a splendid example of true horsemanship.

Analysis of brain-to-brain communication between horses and humans elicits several new ideas worthy of scientific notice. Because our minds interact so well using neural networks, horses and humans might learn to borrow neural signals from the party whose brain offers the highest function. For example, horses have a 340-degree range of view when holding their heads still, compared with a paltry 90-degree range in humans. Therefore, horses can see many objects that are invisible to their riders. Yet riders can sometimes guess that an invisible object exists by detecting subtle equine reactions.

Specifically, neural signals from the horse’s eyes carry the shape of an object to his brain. Those signals are transferred to the rider’s brain by a well-established route: equine receptor cells in the retina lead to equine detector cells in the visual cortex, which elicits an equine motor reaction that is then sensed by the rider’s human body. From there, the horse’s neural signals are transmitted up the rider’s spinal cord to the rider’s brain, and a perceptual communication loop is born. The rider’s brain can now respond neurally to something it is incapable of seeing, by borrowing the horse’s superior range of vision.

These brain-to-brain transfers are mutual, so the learning equine brain should also be able to borrow the rider’s vision, with its superior depth perception and focal acuity. This kind of neural interaction results in a horse-and-human team that can sense far more together than either party can detect alone. In effect, they share effort by assigning labour to the party whose skills are superior at a given task.

There is another type of skillset that requires a particularly nuanced cellular dance: sharing attention and focus. Equine vigilance allowed horses to survive 56 million years of evolution – they had to notice slight movements in tall grasses or risk becoming some predator’s dinner. Consequently, today it’s difficult to slip even a tiny change past a horse, especially a young or inexperienced animal who has not yet been taught to ignore certain sights, sounds and smells.

By contrast, humans are much better at concentration than vigilance. The predator brain does not need to notice and react instantly to every stimulus in the environment. In fact, it would be hampered by prey vigilance. While reading this essay, your brain sorts away the sound of traffic past your window, the touch of clothing against your skin, the sight of the masthead that says ‘Aeon’ at the top of this page. Ignoring these distractions allows you to focus on the content of this essay.

Horses and humans frequently share their respective attentional capacities during a performance. A puissance horse galloping toward an enormous wall cannot waste vigilance by noticing the faces of each person in the audience. Likewise, the rider cannot afford to miss a loose dog that runs into the arena outside her narrow range of vision and focus. Each party helps the other through their primary strengths.

Such sharing becomes automatic with practice. With innumerable neural contacts over time, the human brain learns to heed signals sent by the equine brain that say, in effect: ‘Hey, what’s that over there?’ Likewise, the equine brain learns to sense human neural signals that counter: ‘Let’s focus on this gigantic wall right here.’ Each party sends these messages by body language and receives them by body awareness through two spinal cords, then interprets them inside two brains, millisecond by millisecond.

The rider’s physical cues are transmitted by neural activation from the horse’s surface receptors to the horse’s brain

Finally, it is conceivable that horse and rider can learn to share features of executive function – the human brain’s ability to set goals, plan steps to achieve them, assess alternatives, make decisions and evaluate outcomes. Executive function occurs in the prefrontal cortex, an area that does not exist in the equine brain. Horses are excellent at learning, remembering and communicating – but they do not assess, decide, evaluate or judge as humans do.

Shying is a prominent equine behaviour that might be mediated by human executive function in well-trained mounts. When a horse of average size shies away from an unexpected stimulus, riders are sitting on top of 1,200 pounds of muscle that suddenly leaps sideways off all four feet and lands five yards away. It’s a frightening experience, and often results in falls that lead to injury or even death. The horse’s brain causes this reaction automatically by direct connection between his sensory and motor cortices.

Though this possibility must still be studied by rigorous science, brain-to-brain communication suggests that horses might learn to borrow small glimmers of executive function through neural interaction with the human’s prefrontal cortex. Suppose that a horse shies from an umbrella that suddenly opens. By breathing steadily, relaxing her muscles, and flexing her body in rhythm with the horse’s gait, the rider calms the animal using body language. Her physical cues are transmitted by neural activation from his surface receptors to his brain. He responds with body language in which his muscles relax, his head lowers, and his frightened eyes return to their normal size. The rider feels these changes with her body, which transmits the horse’s neural signals to the rider’s brain.

From this point, it’s only a very short step – but an important one – to the transmission and reception of neural signals between the rider’s prefrontal cortex (which evaluates the unexpected umbrella) and the horse’s brain (which instigates the leap away from that umbrella). In practice, to reduce shying, horse trainers teach their young charges to slow their reactions and seek human guidance.

Brain-to-brain communication between horses and riders is an intricate neural dance. These two species, one prey and one predator, are living temporarily in each other’s brains, sharing neural information back and forth in real time without linguistic or mechanical mediation. It is a partnership like no other. Together, a horse-and-human team experiences a richer perceptual and attentional understanding of the world than either member can achieve alone. And, ironically, this extended interspecies mind operates well not because the two brains are similar to each other, but because they are so different.

Janet Jones applies brain research to training horses and riders. She has a PhD from the University of California, Los Angeles, and for 23 years taught the neuroscience of perception, language, memory, and thought. She trained horses at a large stable early in her career, and later ran a successful horse-training business of her own. Her most recent book, Horse Brain, Human Brain (2020), is currently being translated into seven languages.

Edited by Pam Weintraub

Friend or Foe? Crows Never Forget a Face, It Seems (New York Times)

nytimes.com

Michelle Nijhuis


Aug. 25, 2008

Crows and their relatives — among them ravens, magpies and jays — are renowned for their intelligence and for their ability to flourish in human-dominated landscapes. That ability may have to do with cross-species social skills. In the Seattle area, where rapid suburban growth has attracted a thriving crow population, researchers have found that the birds can recognize individual human faces.

John M. Marzluff, a wildlife biologist at the University of Washington, has studied crows and ravens for more than 20 years and has long wondered if the birds could identify individual researchers. Previously trapped birds seemed more wary of particular scientists, and often were harder to catch. “I thought, ‘Well, it’s an annoyance, but it’s not really hampering our work,’ ” Dr. Marzluff said. “But then I thought we should test it directly.”

To test the birds’ recognition of faces separately from that of clothing, gait and other individual human characteristics, Dr. Marzluff and two students wore rubber masks. He designated a caveman mask as “dangerous” and, in a deliberate gesture of civic generosity, a Dick Cheney mask as “neutral.” Researchers in the dangerous mask then trapped and banded seven crows on the university’s campus in Seattle.

In the months that followed, the researchers and volunteers donned the masks on campus, this time walking prescribed routes and not bothering crows.

The crows had not forgotten. They scolded people in the dangerous mask significantly more than they did before they were trapped, even when the mask was disguised with a hat or worn upside down. The neutral mask provoked little reaction. The effect has not only persisted, but also multiplied over the past two years. Wearing the dangerous mask on one recent walk through campus, Dr. Marzluff said, he was scolded by 47 of the 53 crows he encountered, many more than had experienced or witnessed the initial trapping. The researchers hypothesize that crows learn to recognize threatening humans from both parents and others in their flock.

After their experiments on campus, Dr. Marzluff and his students tested the effect with more realistic masks. Using a half-dozen students as models, they enlisted a professional mask maker, then wore the new masks while trapping crows at several sites in and around Seattle. The researchers then gave a mix of neutral and dangerous masks to volunteer observers who, unaware of the masks’ histories, wore them at the trapping sites and recorded the crows’ responses.

The reaction to one of the dangerous masks was “quite spectacular,” said one volunteer, Bill Pochmerski, a retired telephone company manager who lives near Snohomish, Wash. “The birds were really raucous, screaming persistently,” he said, “and it was clear they weren’t upset about something in general. They were upset with me.”

Again, crows were significantly more likely to scold observers who wore a dangerous mask, and when confronted simultaneously by observers in dangerous and neutral masks, the birds almost unerringly chose to persecute the dangerous face. In downtown Seattle, where most passersby ignore crows, angry birds nearly touched their human foes. In rural areas, where crows are more likely to be viewed as noisy “flying rats” and shot, the birds expressed their displeasure from a distance.

Though Dr. Marzluff’s is the first formal study of human face recognition in wild birds, his preliminary findings confirm the suspicions of many other researchers who have observed similar abilities in crows, ravens, gulls and other species. The pioneering animal behaviorist Konrad Lorenz was so convinced of the perceptive capacities of crows and their relatives that he wore a devil costume when handling jackdaws. Stacia Backensto, a master’s student at the University of Alaska Fairbanks who studies ravens in the oil fields on Alaska’s North Slope, has assembled an elaborate costume — including a fake beard and a potbelly made of pillows — because she believes her face and body are familiar to previously captured birds.

Kevin J. McGowan, an ornithologist at the Cornell Laboratory of Ornithology who has trapped and banded crows in upstate New York for 20 years, said he was regularly followed by birds who have benefited from his handouts of peanuts — and harassed by others he has trapped in the past.

Why crows and similar species are so closely attuned to humans is a matter of debate. Bernd Heinrich, a professor emeritus at the University of Vermont known for his books on raven behavior, suggested that crows’ apparent ability to distinguish among human faces is a “byproduct of their acuity,” an outgrowth of their unusually keen ability to recognize one another, even after many months of separation.

Dr. McGowan and Dr. Marzluff believe that this ability gives crows and their brethren an evolutionary edge. “If you can learn who to avoid and who to seek out, that’s a lot easier than continually getting hurt,” Dr. Marzluff said. “I think it allows these animals to survive with us — and take advantage of us — in a much safer, more effective way.”

Crows are self-aware just like us, says new study (Big Think)

Neuropsych — September 29, 2020

Crows have their own version of the human cerebral cortex.
Credit: Amarnath Tade/ Unsplash

Robby Berman Share Crows are self-aware just like us, says new study on Facebook Share Crows are self-aware just like us, says new study on Twitter Share Crows are self-aware just like us, says new study on LinkedIn Crows and the rest of the corvid family keep turning out to be smarter and smarter. New research observes them thinking about what they’ve just seen and associating it with an appropriate response. A corvid’s pallium is packed with more neurons than a great ape’s.


It’s no surprise that corvids — the “crow family” of birds that also includes ravens, jays, magpies, and nutcrackers — are smart. They use tools, recognize faces, leave gifts for people they like, and there’s even a video on Facebook showing a crow nudging a stubborn little hedgehog out of traffic. Corvids will also drop rocks into water to push floating food their way.

What is perhaps surprising is what the authors of a new study published last week in the journal Science have found: Crows are capable of thinking about their own thoughts as they work out problems. This is a level of self-awareness previously believed to signify the kind of higher intelligence that only humans and possibly a few other mammals possess. A crow knows what a crow knows, and if this brings the word sentience to your mind, you may be right.

Credit: Neoplantski/Alexey Pushkin/Shutterstock/Big Think

It’s long been assumed that higher intellectual functioning is strictly the product of a layered cerebral cortex. But bird brains are different. The authors of the study found crows’ unlayered but neuron-dense pallium may play a similar role for the avians. Supporting this possibility, another study published last week in Science finds that the neuroanatomy of pigeons and barn owls may also support higher intelligence.

“It has been a good week for bird brains!” crow expert John Marzluff of the University of Washington tells Stat. (He was not involved in either study.)

Corvids are known to be as mentally capable as monkeys and great apes. However, bird neurons are so much smaller that their palliums actually contain more of them than would be found in an equivalent-sized primate cortex. This may constitute a clue regarding their expansive mental capabilities.

In any event, there appears to be a general correspondence between the number of neurons an animal has in its pallium and its intelligence, says Suzana Herculano-Houzel in her commentary on both new studies for Science. Humans, she says, sit “satisfyingly” atop this comparative chart, having even more neurons there than elephants, despite our much smaller body size. It’s estimated that crow brains have about 1.5 billion neurons.

Ozzie and Glenn not pictured. Credit: narubono/Unsplash

The kind of higher intelligence crows exhibited in the new research is similar to the way we solve problems. We catalog relevant knowledge and then explore different combinations of what we know to arrive at an action or solution.

The researchers, led by neurobiologist Andreas Nieder of the University of Tübingen in Germany, trained two carrion crows (Corvus corone), Ozzie and Glenn.

The crows were trained to watch for a flash — which didn’t always appear — and then peck at a red or blue target to register whether or not a flash of light was seen. Ozzie and Glenn were also taught to understand a changing “rule key” that specified whether red or blue signified the presence of a flash with the other color signifying that no flash occurred.

In each round of a test, after a flash did or didn’t appear, the crows were presented a rule key describing the current meaning of the red and blue targets, after which they pecked their response.

This sequence prevented the crows from simply rehearsing their response on auto-pilot, so to speak. In each test, they had to take the entire process from the top, seeing a flash or no flash, and then figuring out which target to peck.

As all this occurred, the researchers monitored their neuronal activity. When Ozzie or Glenn saw a flash, sensory neurons fired and then stopped as the bird worked out which target to peck. When there was no flash, no firing of the sensory neurons was observed before the crow paused to figure out the correct target.

Nieder’s interpretation of this sequence is that Ozzie or Glenn had to see or not see a flash, deliberately note that there had or hadn’t been a flash — exhibiting self-awareness of what had just been experienced — and then, in a few moments, connect that recollection to their knowledge of the current rule key before pecking the correct target.

During those few moments after the sensory neuron activity had died down, Nieder reported activity among a large population of neurons as the crows put the pieces together preparing to report what they’d seen. Among the busy areas in the crows’ brains during this phase of the sequence was, not surprisingly, the pallium.

Overall, the study may eliminate the layered cerebral cortex as a requirement for higher intelligence. As we learn more about the intelligence of crows, we can at least say with some certainty that it would be wise to avoid angering one.

Nós podemos aprender muito sobre tolerância com outros primatas, diz ensaísta (Folha de S.Paulo)

www1.folha.uol.com.br

Leão Serva, 2 de julho de 2021

Primatologista Frans De Waal fala sobre a inteligência e as emoções dos macacos


O encontro entre a chimpanzé idosa, dias antes de morrer, e seu amigo da vida toda, cientista também idoso, é uma cena inesquecível: a alegria irradiante de Mama, 59, ao abraçar o primatologista Jan Van Hooff, já octogenário, é um gesto reconhecível por milhões de espectadores do Youtube, em todos os cantos do planeta.

O ensaísta Frans de Waal, autor de best-sellers como “A Era da Empatia” e outros estudos sobre comportamentos e emoções dos macacos, usou a cena como mote e título de seu novo livro, “O Último Abraço da Matriarca” (Zahar, 452 págs.).

De Waal foi aluno de Van Hoof e conhecia muito bem Mama, a quem ele estudou e acompanhou por meio século de estudos do comportamento animal.

Como em seus outros livros, o conteúdo é um permanente diálogo entre o comportamento animal e o dos homens. Os chimpanzés e bonobos, que ele define como nossos “parentes” mais próximos, são usados para entender comportamentos humanos e destacar aquelas características que perdemos ou esquecemos ao longo do processo evolutivo.

Algumas delas, qualidades essenciais, atualíssimas, como a tolerância com os indivíduos que tem comportamentos diferentes.

Nesta entrevista, ele antecipa que seu novo livro terá como tema a questão de gêneros nas sociedades de primatas. E antecipa uma conclusão: “Creio que nós humanos podemos aprender muito sobre tolerância com eles”.

A revista “National Geographic” recentemente publicou uma capa sobre os chimpanzés cujo título era: ‘Sapiens?’, com uma interrogação. O senhor crê que os grandes primatas são sapiens?
Eles são muito inteligentes e nós, humanos, nos orgulhamos de nossa inteligência também. Mas quanto mais estudamos e aprendemos sobre os chimpanzés ao longo dos últimos 25 anos, mais encontramos manifestações do mesmo tipo de inteligência. Por exemplo, os chimpanzés são capazes de pensar adiante, podem pensar no futuro, podem planejar o futuro. Também pensam no passado, se lembram de eventos específicos do passado. Eles testar coisas, criar ferramentas e podem se reconhecer no espelho. Então, existem muitos sinais de que eles têm alto nível de inteligência, que os diferencia dos outros animais.

Em seus livros, o senhor descreve vários rituais e formas de mediação de conflitos entre chimpanzés, como fazer cafuné após uma briga. Quais são as formas similares com que os humanos fazem isso?
Por exemplo, depois de uma briga, eles se beijam e se abraçam. Normalmente, depois de 10 minutos eles se aproximam e têm algum contato e depois disso eles fazem carinhos como cafunés. Nós humanos normalmente somos menos físicos: pedimos desculpas, dizemos alguma coisa ou fazemos algo gentil, como trazer um café, como forma de reconciliação. Mas é claro que se for em uma família, pode ter também uma dimensão física, pode ser até sexual, como acontece em certas espécies de primatas. E abraçar e beijar são comportamentos muito humanos e os humanos também fazem isso.

Então, qual é a principal diferença entre os humanos e os outros primatas?
Há muitas semelhanças entre os pontos básicos de nossa inteligência humana e a desses animais. Há uma área em que temos uma diferença, que é a linguagem. É claro que os macacos se comunicam, como outros animais também, eles têm sinais que fazem uns para os outros. Mas, a comunicação simbólica, que pode se desenvolver, mudar, variar, pois o homem tem tantas linguagens diferentes, essa é uma propriedade unicamente humana. E é uma capacidade muito importante, porque podemos nos comunicar com pessoas que estão à distância, como estávamos fazendo agora, sobre coisas que não estão nem aqui e nem aí, isso é algo impossível para outros animais.

Pensando no caso da gorila Koko, que tinha domínio da língua de sinais e com ela se comunicava com humanos, o senhor diria que ela tinha um domínio humano da linguagem?
Não, eu não diria isso. Veja, existem hoje muitos macacos treinados para compreender as línguas de sinais e gestos com as mãos, inclusive comunicação simbólica. Mas os resultados são realmente desapontadores. Eles podem fazer algumas coisas, podem aprender uma centena de símbolos, mas a comunicação com eles continua sendo muito limitada. É mais limitada do que aquela que você pode ter com uma criança de dois anos, aproximadamente. Então, os experimentos de linguagem com macacos já não são muito populares, porque não apresentaram bons resultados.

Suponha que um casal humano tenha um filho e no mesmo momento adote um bebê chimpanzé e decida criar os dois juntos como filhos e irmãos. Até quando o desenvolvimento deles será idêntico?
Essa é uma pergunta interessante, porque pessoas já tentaram isso. Houve famílias nas décadas de 1950 e 1960 que tentaram criar seus filhos na companhia de bebês chimpanzés. O curioso é que esses projetos foram interrompidos porque as crianças humanas começaram a imitar os macacos, ao invés do contrário. As crianças começaram a se comportar como chimpanzés, pulando pra cima e pra baixo e grunhindo como macacos, por isso o programa foi interrompido. Mas os filhotes de macacos, se criados em uma família de humanos, eles fazem muitas das mesmas coisas: eles vêm televisão, gostam de jogar jogos. Algumas vezes eles se comportam fora das regras humanas, escalam as cortinas, sobem no telhado, coisa que as pessoas não gostam nada. Mas, em geral, quando são novos, eles se comportaram como crianças e brincam como crianças.

É correto dizer que só os humanos matam por razões como vingança, ódio, rancor, ambição, inveja e outras razões que não estão ligadas à alimentação ou ao instinto de sobrevivência?
Eu creio que isso seja verdade, porque chimpanzés são animais muito agressivos e eles podem algumas vezes matar uns aos outros por poder, por exemplo, disputa de comando sobre o grupo ou por território, quando eles defendem seus territórios contra outros. Nós temos um outro parente próximo, o bonobo. Eles são tão próximos de nós quanto os chimpanzés. Eles são muito mais amigáveis, não são tão agressivos. Mas há espécies de primatas que matam por outras questões que não só por alimento, sobrevivência ou coisas como essas.

Eu entendo que os chimpanzés tendem a resolver seus conflitos brigando, enquanto os bonobos têm uma diplomacia mais relacionada à sexualidade e à afetividade. O senhor diria que os homens têm um lado chimpanzé mais desenvolvido ou temos características desses dois parentes, dessas duas tendências?
Nós temos os dois lados: nós podemos ser eróticos e sexuais como os bonobos mas também podemos nos tornar violentos como os chimpanzés. Entre os chimpanzés, os homens são os dominantes enquanto os bonobos são dominados pelas mulheres. Por isso algumas pessoas dizem que somos mais parecidos com os chimpanzés. Eu não tenho essa certeza, eu acredito que temos muito da empatia e da sexualidade dos bonobos. Então, eu creio que somos uma mistura das duas espécies. Além disso, nós temos nossa própria evolução, a evolução humana, que se desenvolve há muito tempo. Nós desenvolvemos coisas novas, como a linguagem e o modelo de famílias, formadas por Pai, Mãe e crianças. Isso não vemos em nenhum outro macaco.

Em seus livros o senhor mostra que os macacos são capazes de entender a linguagem corporal dos outros, muito mais do que nós humanos conseguimos. O senhor acredita que o predomínio da linguagem verbal deteriorou nossa capacidade de entender as expressões do corpo?
É uma questão interessante: nós humanos confiamos tanto na linguagem verbal, prestamos tanta atenção ao que uma pessoa diz que muitas vezes esquecemos o quanto somos sensíveis a questões como a expressão facial, o tom de voz, o corpo. Nós somos de fato muito bons na leitura da linguagem corporal mas muitas vezes esquecemos isso. Por exemplo: quando eu vejo debates entre políticos na TV, frequentemente tiro o som, não quero ouvir o que eles dizem porque eles estão sempre mentindo, quero apenas ver sua linguagem corporal, que ela é muito mais informativa do que a linguagem verbal.

E ao observá-lo, o senhor diria que Donald Trump é um macho alfa, se comporta como um líder chimpanzé?
O problema com isso é que eu usei a expressão “macho alfa” para definir machos chimpanzés e muitos dos “machos alfa” que eu conheço são bons líderes: eles mantêm o grupo unido, eles unem as partes quando se dividem, garantem a preservação da ordem na sociedade, eles têm empatia pelos outros. Essas são qualidades que muitos líderes do mundo humano não têm. Nós os chamamos algumas vezes de “alfa” porque eles são dominantes, eles comandam a cena política mas não agem como “machos alfa” em termos de liderança. Liderança, e isso vale também para as mulheres, que podem ser líderes também, é juntar as partes, mantê-las unidas, preservar a ordem na sociedade e nem todos os “machos alfa” são bons nisso.

Seus livros costumam tratar das emoções dos animais e suas relações com as emoções e comportamentos humanos. Quanto nós podemos aprender com os macacos e com isso obter um comportamento melhor de nossa sociedade?
Meus livros não dizem como organizar uma sociedade humana, porque eu falo sobre bonobos, chimpanzés e outros primatas. Eu não sinto que podemos tomar lições diretamente daí. Mas o que eu posso dizer é que a psicologia humana é muito antiga. Nós costumamos pensar que inventamos tudo. De fato nós inventamos muitas coisas de tecnologia: o telefone celular, o avião etc. Mas nosso comportamento e nossa psicologia são muito antigos. Então, a mensagem dos meus livros é que muitas das tendências que nós temos são ancestrais, elas são como as dos primatas. E nesse sentido é que podemos aprender com os primatas. Podemos aprender que em suas comunidades eles resolvem conflitos, são muito bons em se reconciliar depois, em dividir alimentos… Essas são coisas que podemos aprender com os animais.

Seu livro “A Era da Empatia” me deixou a impressão de que o senhor tem o desejo de empoderar o lado bonobo que temos dentro de nós humanos. Estou certo?
Empatia é uma característica muito antiga dos mamíferos. Muitos mamíferos têm empatia, seu cachorro tem empatia. Os cientistas fizeram experiências: pediram para os adultos em uma família chorarem, para observar como os cachorros e as crianças reagem. E ambos reagem procurando se aproximar da pessoa que está chorando para consolá-la e dar conforto. Essa é uma atitude de empatia que podemos observar em todos os mamíferos. Nós humanos temos uma enorme capacidade de exercer a empatia, mas às vezes nos esquecemos disso. Especialmente, com estranhos, com gente de fora de nosso círculo, nós às vezes não revelamos esse tipo de empatia.

Falando da cena que serve de título a seu livro, o abraço final da chimpanzé Mama e do cientista que ela conheceu a vida toda: ela sabia que estava morrendo, que iria morrer em duas semanas? Os chimpanzés enfrentam a morte?
Nesta cena, meu professor, Jan van Hooff, com oitenta anos, se aproximou da chimpanzé Mama, que estava com 59 anos e estava morrendo. Ele entrou em sua jaula; ela vivia em uma área grande, com um grande grupo de chimpanzés, mas dormia em uma jaula. Ele entrou na jaula, o que nós nunca, nunca fazemos porque os macacos são muito mais fortes do que nós. Mas ele fez isso, porque ela estava morrendo. E ela o cumprimentou com um abraço. Ele sabia que ela iria morrer, estava muito fraca, e nós a conhecíamos muito bem. E ela logo o acolheu, o abraçou. O professor Van Hooff entrou lá sabendo que ela estava morrendo, mas não sabemos se ela sabia que ia morrer. Nós não sabemos se os animais têm um senso de mortalidade. Ela evidentemente sabia que estava fraca, mas não podemos afirmar que ela tinha consciência da morte. O encontro era uma oportunidade do professor se despedir dela, não sabemos se ela via aquele momento do mesmo jeito. O motivo de eu trazer esse encontro para o título do livro foi porque aquele momento, além de deixar as pessoas muito emocionadas, nos deixa muito surpresos: como os gestos são parecidos com gestos humanos, como suas expressões são parecidas com humanas. E essa reação das pessoas me surpreendeu. Nós estamos dizendo há cerca de 50 anos que os bonobos e chimpanzés são muito próximos dos seres humanos; então por que as pessoas ainda se surpreendem com suas emoções e suas expressões que parece humanas? Então por isso decidi tomar essa cena para explicar que todas as expressões faciais que nós humanos temos bem como todas as emoções que temos podem ser encontradas em nossos parentes próximos, os primatas.

Em seu livro você narra a história de uma mãe chimpanzé cujo filhote morre e ela segue carregando seu corpo por um longo período. Ela achava que ele estava vivo ou fingia que ele estava vivo?
Isso acontece com frequência. Os laços entre mãe e filho são muito fortes. Então, quando a criança morre, as mães não os abandonam. Isso é verdade com humanos, com orcas e golfinhos, ocorre com os primatas. As mães carregam os corpos de seus bebês mortos com elas. Eu penso que para elas é uma forma de manter o contato com eles. Eu acho que sim, elas sabem que seus filhos morreram, elas sabem que ele está morto, mesmo assim querem mantê-los juntos. Creio que isso é se deve à força dos laços fortíssimos entre eles e essa é uma forma de tornar gradual o processo de separação.

Podemos dizer que humanos demonstram isso com fotos e outros objetos?
Entre humanos, nós esperamos que a mãe, quando o filho morre, se separe do corpo. Mas muitas mães têm a tendência de segurá-lo e provavelmente elas manifestam isso mantendo as memórias vivas. Nunca é uma separação completa. Quando perdemos uma pessoa, nunca nos separamos completamente dela.

O senhor tem um livro inédito no Brasil cujo título é uma pergunta: “Somos Inteligentes o Suficiente para Entender Como os Animais são Inteligentes” (Are We Smart Enough to Know How Smart Animals Are, 2016)? Qual é sua resposta: somos?
Há um longo tempo nas pesquisas em inteligência animal durante a qual nós, humanos, apresentamos desafios muito simples para os animais. Tipo: colocamos um rato em uma caixa e o rato tem que apertar várias vezes uma alavanca para receber recompensas por isso e essa é a forma como testamos sua inteligência. Mas o rato é um animal muito mais inteligente do que isso, ele pode fazer muito mais coisas do que apertar uma alavanca. Então, nós não temos sido muito inteligentes no jeito de testar a inteligência animal. Especialmente com os macacos, os elefantes, os golfinhos, esses animais muito inteligentes, nós não devemos submetê-los a testes simples, devemos fazer testes apropriados para suas capacidades. Algumas vezes é muito difícil; por exemplo, a capacidade do olfato de um elefante é cem vezes maior do que a de um cachorro, que é cem vezes melhor do que nós somos. Então, temos que fazer testes que desafiem o olfato do elefante, mas isso é muito difícil criarmos, porque somos uma espécie muito visual. É complicado para os humanos trabalharem no mesmo nível das capacidades desses animais.

O sermos visuais e verbais reduz as outras dimensões de nossa inteligência?
Sim. Por exemplo, o senso de localização dos morcegos, que permite que eles voem no escuro e capturem insetos, é uma capacidade muito complexa, mas nós humanos não somos muito interessados nisso. Nós somos interessados no uso de ferramentas, em linguagens, porque somos muito bons nisso. As coisas que os morcegos fazem não nos interessam muito, porque não temos essas capacidades. Nós humanos somos muito antropocêntricos, temos viés humanos, admiramos como somos inteligentes. Então, pesquisamos o uso de ferramentas e as linguagens dos outros animais, porque somos bons nisso.

O senso comum criado pela influência das religiões diz que a linguagem é um monopólio do homem, um dom concedido unicamente ao homem. O senhor diria que nos próximos 25 anos poderemos ter surpresas nesse campo, quanto à capacidade de comunicação dos outros seres vivos?
Os animais nos têm surpreendido ao longo dos últimos 25 anos. Todos os tipos de domínios, todos os estudos têm demonstrado isso. E há animais que têm formas de comunicação muito complexas, mesmo que não sejam como a nossa linguagem, mas tipos diferentes. Por exemplo: golfinhos têm muitos sons, embaixo d’água, que nós humanos temos dificuldade de ouvir, mas com sensores temos condições de ouvir e gravar, que revelam uma comunicação complexa. E quem consegue entender o que está acontecendo ali? Por isso, eu creio que sim, vamos nos surpreender com as descobertas que faremos sobre a sofisticação da comunicação de outros animais, que pode não ser exatamente como a linguagem humana mas ser muito complexa. Então, eu não creio que sejamos os únicos animais com capacidade de comunicar coisas complicadas uns para os outros.

O senhor tem um vídeo muito popular no Youtube que mostra um macaco que se irrita por ter recebido uma recompensa pior que outro indivíduo ao realizar a mesma tarefa. Lutar por justiça é uma característica primata, antes de ser humana?
Nesse vídeo há dois macacos-prego, que é uma espécie que existe no Brasil, um recebe passas ao realizar a tarefa e o outro recebe pedaços de pepino cortado. Normalmente, se você dá pepinos aos dois macacos, eles vão achar ótimo. Mas se você dá passas a um e pepino para o outro, o que recebe o pepino vai ficar muito bravo. Nós chamamos isso de aversão pela desigualdade mas você pode chamar de senso de justiça. Eles são sensíveis quanto ao que recebem pelo que realizam, em comparação com o que outra pessoa recebe. Eu creio que isso é a raiz do senso de justiça na sociedade humana. Nós também ficamos irritados se alguém ganha um pagamento maior pelo mesmo trabalho.

O senhor já está trabalhando em um novo livro?
Sim, estou trabalhando em um livro sobre gênero, as diferenças entre os sexos. Em todos os primatas vemos diferenças, como nas sociedades humanas. Eu estou estudando isso.

Há outras espécies de primatas em que se pode encontrar mais de dois gêneros?
Sim, há sempre indivíduos em sociedades primatas que são diferentes dos outros. Por exemplo: fêmeas que agem mais como machos ou machos que agem mais como fêmeas; há também indivíduos que não se encaixam em nenhum desses estereótipos. Então, de fato, tipos de diferenças que observamos na sociedade humana aparecem também em outros animais.

Então podemos aprender também com os outros primatas sobre respeito aos transgêneros?
Eu também escrevi sobre homossexualidade entre os primatas. O mais interessante para mim é que eles toleram qualquer comportamento, sem qualquer problema. Eles não criam agitação em torno do assunto, não é uma questão importante. Se você tem um indivíduo em uma sociedade que não se comporta como outros machos do grupo, ninguém vai se perturbar por isso. Creio que nós humanos podemos aprender muito sobre tolerância com eles, sim.

Understanding fruit fly behavior may be next step toward autonomous vehicles (Science Daily)

Could the way drosophila use antennae to sense heat help us teach self-driving cars make decisions?

Date: April 6, 2021

Source: Northwestern University

Summary: With over 70% of respondents to a AAA annual survey on autonomous driving reporting they would fear being in a fully self-driving car, makers like Tesla may be back to the drawing board before rolling out fully autonomous self-driving systems. But new research shows us we may be better off putting fruit flies behind the wheel instead of robots.


With over 70% of respondents to a AAA annual survey on autonomous driving reporting they would fear being in a fully self-driving car, makers like Tesla may be back to the drawing board before rolling out fully autonomous self-driving systems. But new research from Northwestern University shows us we may be better off putting fruit flies behind the wheel instead of robots.

Drosophila have been subjects of science as long as humans have been running experiments in labs. But given their size, it’s easy to wonder what can be learned by observing them. Research published today in the journal Nature Communications demonstrates that fruit flies use decision-making, learning and memory to perform simple functions like escaping heat. And researchers are using this understanding to challenge the way we think about self-driving cars.

“The discovery that flexible decision-making, learning and memory are used by flies during such a simple navigational task is both novel and surprising,” said Marco Gallio, the corresponding author on the study. “It may make us rethink what we need to do to program safe and flexible self-driving vehicles.”

According to Gallio, an associate professor of neurobiology in the Weinberg College of Arts and Sciences, the questions behind this study are similar to those vexing engineers building cars that move on their own. How does a fruit fly (or a car) cope with novelty? How can we build a car that is flexibly able to adapt to new conditions?

This discovery reveals brain functions in the household pest that are typically associated with more complex brains like those of mice and humans.

“Animal behavior, especially that of insects, is often considered largely fixed and hard-wired — like machines,” Gallio said. “Most people have a hard time imagining that animals as different from us as a fruit fly may possess complex brain functions, such as the ability to learn, remember or make decisions.”

To study how fruit flies tend to escape heat, the Gallio lab built a tiny plastic chamber with four floor tiles whose temperatures could be independently controlled and confined flies inside. They then used high-resolution video recordings to map how a fly reacted when it encountered a boundary between a warm tile and a cool tile. They found flies were remarkably good at treating heat boundaries as invisible barriers to avoid pain or harm.

Using real measurements, the team created a 3D model to estimate the exact temperature of each part of the fly’s tiny body throughout the experiment. During other trials, they opened a window in the fly’s head and recorded brain activity in neurons that process external temperature signals.

Miguel Simões, a postdoctoral fellow in the Gallio lab and co-first author of the study, said flies are able to determine with remarkable accuracy if the best path to thermal safety is to the left or right. Mapping the direction of escape, Simões said flies “nearly always” escape left when they approach from the right, “like a tennis ball bouncing off a wall.”

“When flies encounter heat, they have to make a rapid decision,” Simões said. “Is it safe to continue, or should it turn back? This decision is highly dependent on how dangerous the temperature is on the other side.”

Observing the simple response reminded the scientists of one of the classic concepts in early robotics.

“In his famous book, the cyberneticist Valentino Braitenberg imagined simple models made of sensors and motors that could come close to reproducing animal behavior,” said Josh Levy, an applied math graduate student and a member of the labs of Gallio and applied math professor William Kath. “The vehicles are a combination of simple wires, but the resulting behavior appears complex and even intelligent.”

Braitenberg argued that much of animal behavior could be explained by the same principles. But does that mean fly behavior is as predictable as that of one of Braitenberg’s imagined robots?

The Northwestern team built a vehicle using a computer simulation of fly behavior with the same wiring and algorithm as a Braitenberg vehicle to see how closely they could replicate animal behavior. After running model race simulations, the team ran a natural selection process of sorts, choosing the cars that did best and mutating them slightly before recombining them with other high-performing vehicles. Levy ran 500 generations of evolution in the powerful NU computing cluster, building cars they ultimately hoped would do as well as flies at escaping the virtual heat.

This simulation demonstrated that “hard-wired” vehicles eventually evolved to perform nearly as well as flies. But while real flies continued to improve performance over time and learn to adopt better strategies to become more efficient, the vehicles remain “dumb” and inflexible. The researchers also discovered that even as flies performed the simple task of escaping the heat, fly behavior remains somewhat unpredictable, leaving space for individual decisions. Finally, the scientists observed that while flies missing an antenna adapt and figure out new strategies to escape heat, vehicles “damaged” in the same way are unable to cope with the new situation and turn in the direction of the missing part, eventually getting trapped in a spin like a dog chasing its tail.

Gallio said the idea that simple navigation contains such complexity provides fodder for future work in this area.

Work in the Gallio lab is supported by the NIH (Award No. R01NS086859 and R21EY031849), a Pew Scholars Program in the Biomedical Sciences and a McKnight Technological Innovation in Neuroscience Awards.


Story Source:

Materials provided by Northwestern University. Original written by Lila Reynolds. Note: Content may be edited for style and length.


Journal Reference:

  1. José Miguel Simões, Joshua I. Levy, Emanuela E. Zaharieva, Leah T. Vinson, Peixiong Zhao, Michael H. Alpert, William L. Kath, Alessia Para, Marco Gallio. Robustness and plasticity in Drosophila heat avoidance. Nature Communications, 2021; 12 (1) DOI: 10.1038/s41467-021-22322-w

Sperm whales in 19th century shared ship attack information (The Guardian)

Whalers’ logbooks show rapid drop in strike rate in north Pacific due to changes in cetacean behaviour

Philip Hoare @philipwhale

Wed 17 Mar 2021 07.01 GMT Last modified on Thu 18 Mar 2021 14.38 GMT

When facing a human attack, sperm whales abandoned the defensive circles used against orca and swam upwind instead.
When facing a human attack, sperm whales abandoned the defensive circles used against orca and swam upwind instead. Photograph: Alamy

A remarkable new study on how whales behaved when attacked by humans in the 19th century has implications for the way they react to changes wreaked by humans in the 21st century.

The paper, published by the Royal Society on Wednesday, is authored by Hal Whitehead and Luke Rendell, pre-eminent scientists working with cetaceans, and Tim D Smith, a data scientist, and their research addresses an age-old question: if whales are so smart, why did they hang around to be killed? The answer? They didn’t.

Using newly digitised logbooks detailing the hunting of sperm whales in the north Pacific, the authors discovered that within just a few years, the strike rate of the whalers’ harpoons fell by 58%. This simple fact leads to an astonishing conclusion: that information about what was happening to them was being collectively shared among the whales, who made vital changes to their behaviour. As their culture made fatal first contact with ours, they learned quickly from their mistakes.

“Sperm whales have a traditional way of reacting to attacks from orca,” notes Hal Whitehead, who spoke to the Guardian from his house overlooking the ocean in Halifax, Nova Scotia, where he teaches at Dalhousie University. Before humans, orca were their only predators, against whom sperm whales form defensive circles, their powerful tails held outwards to keep their assailants at bay. But such techniques “just made it easier for the whalers to slaughter them”, says Whitehead.

It was a frighteningly rapid killing, and it accompanied other threats to the ironically named Pacific. From whaling and sealing stations to missionary bases, western culture was imported to an ocean that had remained largely untouched. As Herman Melville, himself a whaler in the Pacific in 1841, would write in Moby-Dick (1851): “The moot point is, whether Leviathan can long endure so wide a chase, and so remorseless a havoc.”

Sperm whales are highly socialised animals, able to communicate over great distances. They associate in clans defined by the dialect pattern of their sonar clicks. Their culture is matrilinear, and information about the new dangers may have been passed on in the same way whale matriarchs share knowledge about feeding grounds. Sperm whales also possess the largest brain on the planet. It is not hard to imagine that they understood what was happening to them.

The hunters themselves realised the whales’ efforts to escape. They saw that the animals appeared to communicate the threat within their attacked groups. Abandoning their usual defensive formations, the whales swam upwind to escape the hunters’ ships, themselves wind-powered. ‘This was cultural evolution, much too fast for genetic evolution,’ says Whitehead.

And in turn, it evokes another irony. Now, just as whales are beginning to recover from the industrial destruction by 20th-century whaling fleets – whose steamships and grenade harpoons no whale could evade – they face new threats created by our technology. ‘They’re having to learn not to get hit by ships, cope with the depredations of longline fishing, the changing source of their food due to climate change,’ says Whitehead. Perhaps the greatest modern peril is noise pollution, one they can do nothing to evade.

Whitehead and Randall have written persuasively of whale culture, expressed in localised feeding techniques as whales adapt to shifting sources, or in subtle changes in humpback song whose meaning remains mysterious. The same sort of urgent social learning the animals experienced in the whale wars of two centuries ago is reflected in the way they negotiate today’s uncertain world and what we’ve done to it.

As Whitehead observes, whale culture is many millions of years older than ours. Perhaps we need to learn from them as they learned from us. After all, it was the whales that provoked Melville to his prophesies in Moby-Dick. “We account the whale immortal in his species, however perishable in individuality,” he wrote, “and if ever the world is to be again flooded … then the eternal whale will still survive, and … spout his frothed defiance to the skies.”

• This article was amended on 18 March 2021 to make clear the status of “Dalhousie” as a university, not a placename.

The remarkable ways animals understand numbers (BBC Future)

bbc.com

Andreas Nieder, September 7, 2020

(Credit: Press Association)

For some species there is strength and safety in numbers (Credit: Press Association)

Humans as a species are adept at using numbers, but our mathematical ability is something we share with a surprising array of other creatures.

One of the key findings over the past decades is that our number faculty is deeply rooted in our biological ancestry, and not based on our ability to use language. Considering the multitude of situations in which we humans use numerical information, life without numbers is inconceivable.

But what was the benefit of numerical competence for our ancestors, before they became Homo sapiens? Why would animals crunch numbers in the first place?

It turns out that processing numbers offers a significant benefit for survival, which is why this behavioural trait is present in many animal populations. Several studies examining animals in their ecological environments suggest that representing numbers enhances an animal’s ability to exploit food sources, hunt prey, avoid predation, navigate its habitat, and persist in social interactions.

Before numerically competent animals evolved on the planet, single-celled microscopic bacteria – the oldest living organisms on Earth – already exploited quantitative information. The way bacteria make a living is through their consumption of nutrients from their environment. Mostly, they grow and divide themselves to multiply. However, in recent years, microbiologists have discovered they also have a social life and are able to sense the presence or absence of other bacteria. In other words, they can sense the number of bacteria.

Take, for example, the marine bacterium Vibrio fischeri. It has a special property that allows it to produce light through a process called bioluminescence, similar to how fireflies give off light. If these bacteria are in dilute water solutions (where they are essentially alone), they make no light. But when they grow to a certain cell number of bacteria, all of them produce light simultaneously. Therefore, Vibrio fischeri can distinguish when they are alone and when they are together.

Sometimes the numbers don't add up when predators are trying to work out which prey to target (Credit: Alamy)

Sometimes the numbers don’t add up when predators are trying to work out which prey to target (Credit: Alamy)

It turns out they do this using a chemical language. They secrete communication molecules, and the concentration of these molecules in the water increases in proportion to the cell number. And when this molecule hits a certain amount, called a “quorum”, it tells the other bacteria how many neighbours there are, and all the bacteria glow.

This behaviour is called “quorum sensing” – the bacteria vote with signalling molecules, the vote gets counted, and if a certain threshold (the quorum) is reached, every bacterium responds. This behaviour is not just an anomaly of Vibrio fischeri – all bacteria use this sort of quorum sensing to communicate their cell number in an indirect way via signalling molecules.

Remarkably, quorum sensing is not confined to bacteria – animals use it to get around, too. Japanese ants (Myrmecina nipponica), for example, decide to move their colony to a new location if they sense a quorum. In this form of consensus decision making, ants start to transport their brood together with the entire colony to a new site only if a defined number of ants are present at the destination site. Only then, they decide, is it safe to move the colony.

Numerical cognition also plays a vital role when it comes to both navigation and developing efficient foraging strategies. In 2008, biologists Marie Dacke and Mandyam Srinivasan performed an elegant and thoroughly controlled experiment in which they found that bees are able to estimate the number of landmarks in a flight tunnel to reach a food source – even when the spatial layout is changed. Honeybees rely on landmarks to measure the distance of a food source to the hive. Assessing numbers is vital to their survival.

When it comes to optimal foraging, “going for more” is a good rule of thumb in most cases, and seems obvious when you think about it, but sometimes the opposite strategy is favourable. The field mouse loves live ants, but ants are dangerous prey because they bite when threatened. When a field mouse is placed into an arena together with two ant groups of different quantities, then, it surprisingly “goes for less”. In one study, mice that could choose between five versus 15, five versus 30, and 10 versus 30 ants always preferred the smaller quantity of ants. The field mice seem to pick the smaller ant group in order to ensure comfortable hunting and to avoid getting bitten frequently.

Numerical cues play a significant role when it comes to hunting prey in groups, as well. The probability, for example, that wolves capture elk or bison varies with the group size of a hunting party. Wolves often hunt large prey, such as elk and bison, but large prey can kick, gore, and stomp wolves to death. Therefore, there is incentive to “hold back” and let others go in for the kill, particularly in larger hunting parties. As a consequence, wolves have an optimal group size for hunting different prey. For elks, capture success levels off at two to six wolves. However, for bison, the most formidable prey, nine to 13 wolves are the best guarantor of success. Therefore, for wolves, there is “strength in numbers” during hunting, but only up to a certain number that is dependent on the toughness of their prey.

Animals that are more or less defenceless often seek shelter among large groups of social companions – the strength-in-numbers survival strategy hardly needs explaining. But hiding out in large groups is not the only anti-predation strategy involving numerical competence.

In 2005, a team of biologists at the University of Washington found that black-capped chickadees in Europe developed a surprising way to announce the presence and dangerousness of a predator. Like many other animals, chickadees produce alarm calls when they detect a potential predator, such as a hawk, to warn their fellow chickadees. For stationary predators, these little songbirds use their namesake “chick-a-dee” alarm call. It has been shown that the number of “dee” notes at the end of this alarm call indicates the danger level of a predator.

Chickadees produce different numbers of "dee" notes at the end of their call depending on danger they have spotted (Credit: Getty Images)

Chickadees produce different numbers of “dee” notes at the end of their call depending on danger they have spotted (Credit: Getty Images)

A call such as “chick-a-dee-dee” with only two “dee” notes may indicate a rather harmless great grey owl. Great grey owls are too big to manoeuvre and follow the agile chickadees in woodland, so they aren’t a serious threat. In contrast, manoeuvring between trees is no problem for the small pygmy owl, which is why it is one of the most dangerous predators for these small birds. When chickadees see a pygmy owl, they increase the number of “dee” notes and call “chick-a-dee-dee-dee-dee.” Here, the number of sounds serves as an active anti-predation strategy.

Groups and group size also matter if resources cannot be defended by individuals alone – and the ability to assess the number of individuals in one’s own group relative to the opponent party is of clear adaptive value.

Several mammalian species have been investigated in the wild, and the common finding is that numerical advantage determines the outcome of such fights. In a pioneering study, zoologist Karen McComb and co-workers at the University of Sussex investigated the spontaneous behaviour of female lions at the Serengeti National Park when facing intruders. The authors exploited the fact that wild animals respond to vocalisations played through a speaker as though real individuals were present. If the playback sounds like a foreign lion that poses a threat, the lionesses would aggressively approach the speaker as the source of the enemy. In this acoustic playback study, the authors mimicked hostile intrusion by playing the roaring of unfamiliar lionesses to residents.

Two conditions were presented to subjects: either the recordings of single female lions roaring, or of groups of three females roaring together. The researchers were curious to see if the number of attackers and the number of defenders would have an impact on the defender’s strategy. Interestingly, a single defending female was very hesitant to approach the playbacks of a single or three intruders. However, three defenders readily approached the roaring of a single intruder, but not the roaring of three intruders together.

Obviously, the risk of getting hurt when entering a fight with three opponents was foreboding. Only if the number of the residents was five or more did the lionesses approach the roars of three intruders. In other words, lionesses decide to approach intruders aggressively only if they outnumber the latter – another clear example of an animal’s ability to take quantitative information into account.

Our closest cousins in the animal kingdom, the chimpanzees, show a very similar pattern of behaviour. Using a similar playback approach, Michael Wilson and colleagues from Harvard University found that the chimpanzees behaved like military strategists. They intuitively follow equations used by military forces to calculate the relative strengths of opponent parties. In particular, chimpanzees follow predictions made in Lanchester’s “square law” model of combat. This model predicts that, in contests with multiple individuals on each side, chimpanzees in this population should be willing to enter a contest only if they outnumber the opposing side by a factor of at least 1.5. And that is precisely what wild chimps do.

Lionesses judge how many intruders they may be facing before approaching them (Credit: Alamy)

Lionesses judge how many intruders they may be facing before approaching them (Credit: Alamy)

Staying alive – from a biological stance – is a means to an end, and the aim is the transmission of genes. In mealworm beetles (Tenebrio molitor), many males mate with many females, and competition is intense. Therefore, a male beetle will always go for more females in order to maximise his mating opportunities. After mating, males even guard females for some time to prevent further mating acts from other males. The more rivals a male has encountered before mating, the longer he will guard the female after mating.

It is obvious that such behaviour plays an important role in reproduction and therefore has a high adaptive value. Being able to estimate quantity has improved males’ sexual competitiveness. This may in turn be a driving force for more sophisticated cognitive quantity estimation throughout evolution.

One may think that everything is won by successful copulation. But that is far from the truth for some animals, for whom the real prize is fertilising an egg. Once the individual male mating partners have accomplished their part in the play, the sperm continues to compete for the fertilisation of the egg. Since reproduction is of paramount importance in biology, sperm competition causes a variety of adaptations at the behavioural level.

In both insects and vertebrates, the males’ ability to estimate the magnitude of competition determines the size and composition of the ejaculate. In the pseudoscorpion, Cordylochernes scorpioides, for example, it is common that several males copulate with a single female. Obviously, the first male has the best chances of fertilising this female’s egg, whereas the following males face slimmer and slimmer chances of fathering offspring. However, the production of sperm is costly, so the allocation of sperm is weighed considering the chances of fertilising an egg.

Males smell the number of competitor males that have copulated with a female and adjust by progressively decreasing sperm allocation as the number of different male olfactory cues increases from zero to three.

Some bird species, meanwhile, have invented a whole arsenal of trickery to get rid of the burden of parenthood and let others do the job. Breeding a clutch and raising young are costly endeavours, after all. They become brood parasites by laying their eggs in other birds’ nests and letting the host do all the hard work of incubating eggs and feeding hatchlings. Naturally, the potential hosts are not pleased and do everything to avoid being exploited. And one of the defence strategies the potential host has at its disposal is the usage of numerical cues.

American coots, for example, sneak eggs into their neighbours’ nests and hope to trick them into raising the chicks. Of course, their neighbours try to avoid being exploited. A study in the coots’ natural habitat suggests that potential coot hosts can count their own eggs, which helps them to reject parasitic eggs. They typically lay an average-sized clutch of their own eggs, and later reject any surplus parasitic egg. Coots therefore seem to assess the number of their own eggs and ignore any others.

An even more sophisticated type of brood parasitism is found in cowbirds, a songbird species that lives in North America. In this species, females also deposit their eggs in the nests of a variety of host species, from birds as small as kinglets to those as large as meadowlarks, and they have to be smart in order to guarantee that their future young have a bright future.

Cowbird eggs hatch after exactly 12 days of incubation; if incubation is only 11 days, the chicks do not hatch and are lost. It is therefore not an accident that the incubation times for the eggs of the most common hosts range from 11 to 16 days, with an average of 12 days. Host birds usually lay one egg per day – once one day elapses with no egg added by the host to the nest, the host has begun incubation. This means the chicks start to develop in the eggs, and the clock begins ticking. For a cowbird female, it is therefore not only important to find a suitable host, but also to precisely time their egg laying appropriately. If the cowbird lays her egg too early in the host nest, she risks her egg being discovered and destroyed. But if she lays her egg too late, incubation time will have expired before her cowbird chick can hatch.

Female cowbirds perform some incredible mental arithmetic to know when she should lay her eggs in the next of a host bird (Credit: Alamy)

Female cowbirds perform some incredible mental arithmetic to know when she should lay her eggs in the next of a host bird (Credit: Alamy)

Clever experiments by David J White and Grace Freed-Brown from the University of Pennsylvania suggest that cowbird females carefully monitor the host’s clutch to synchronise their parasitism with a potential host’s incubation. The cowbird females watch out for host nests in which the number of eggs has increased since her first visit. This guarantees that the host is still in the laying process and incubation has not yet started. In addition, the cowbird is looking out for nests that contain exactly one additional egg per number of days that have elapsed since her initial visit.

For instance, if the cowbird female visited a nest on the first day and found one host egg in the nest, she will only deposit her own egg if the host nest contains three eggs on the third day. If the nest contains fewer additional eggs than the number of days that have passed since the last visit, she knows that incubation has already started and it is useless for her to lay her own egg. It is incredibly cognitively demanding, since the female cowbird needs to visit a nest over multiple days, remember the clutch size from one day to the next, evaluate the change in the number of eggs in the nest from a past visit to the present, assess the number of days that have passed, and then compare these values to make a decision to lay her egg or not.

But this is not all. Cowbird mothers also have sinister reinforcement strategies. They keep watch on the nests where they’ve laid their eggs. In an attempt to protect their egg, the cowbirds act like mafia gangsters. If the cowbird finds that her egg has been destroyed or removed from the host’s nest, she retaliates by destroying the host bird’s eggs, pecking holes in them or carrying them out of the nest and dropping them on the ground. The host birds better raise the cowbird nestling, or else they have to pay dearly. For the host parents, it may therefore be worth to go through all the trouble of raising a foster chick from an adaptive point of view.

The cowbird is an astounding example of how far evolution has driven some species to stay in the business of passing on their genes. The existing selection pressures, whether imposed by the inanimate environment or by other animals, force populations of species to maintain or increase adaptive traits caused by specific genes. If assessing numbers helps in this struggle to survive and reproduce, it surely is appreciated and relied on.

This explains why numerical competence is so widespread in the animal kingdom: it evolved either because it was discovered by a previous common ancestor and passed on to all descendants, or because it was invented across different branches of the animal tree of life.

Irrespective of its evolutionary origin, one thing is certain – numerical competence is most certainly an adaptive trait.

* This article originally appeared in The MIT Press Reader, and is republished under a Creative Commons licence. Andreas Nieder is Professor of Animal Physiology and Director of the Institute of Neurobiology at the University of Tübingen and the author of A Brain for Numbers, from which this article is adapted.

When Whales and Humans Talk (Hakai Magazine)

Arctic people have been communicating with cetaceans for centuries—and scientists are finally taking note.

Tattooed Whale, 2016 by Tim Pitsiulak. Screen-print on Arches Cover Black. Reproduced with the permission of Dorset Fine ArtsApril 3rd, 2018

Harry Brower Sr. was lying in a hospital bed in Anchorage, Alaska, close to death, when he was visited by a baby whale.

Although Brower’s body remained in Anchorage, the young bowhead took him more than 1,000 kilometers north to Barrow (now Utqiaġvik), where Brower’s family lived. They traveled together through the town and past the indistinct edge where the tundra gives way to the Arctic Ocean. There, in the ice-blue underwater world, Brower saw Iñupiat hunters in a sealskin boat closing in on the calf’s mother.

Brower felt the shuddering harpoon enter the whale’s body. He looked at the faces of the men in the umiak, including those of his own sons. When he awoke in his hospital bed as if from a trance, he knew precisely which man had made the kill, how the whale had died, and whose ice cellar the meat was stored in. He turned out to be right on all three counts.

Brower lived six years after the episode, dying in 1992 at the age of 67. In his final years, he discussed what he had witnessed with Christian ministers and Utqiaġvik’s whaling captains. The conversations ultimately led him to hand down new rules to govern hunting female whales with offspring, meant to communicate respect to whales and signal that people were aware of their feelings and needs. “[The whale] talked to me,” Brower recalls in a collection of his stories, The Whales, They Give Themselves. “He told me all the stories about where they had all this trouble out there on the ice.”

Not long ago, non-Indigenous scientists might have dismissed Brower’s experience as a dream or the inchoate ramblings of a sick man. But he and other Iñupiat are part of a deep history of Arctic and subarctic peoples who believe humans and whales can talk and share a reciprocal relationship that goes far beyond that of predator and prey. Today, as Western scientists try to better understand Indigenous peoples’ relationships with animals—as well as animals’ own capacity for thoughts and feelings—such beliefs are gaining wider recognition, giving archaeologists a better understanding of ancient northern cultures.

“If you start looking at the relationship between humans and animals from the perspective that Indigenous people themselves may have had, it reveals a rich new universe,” says Matthew Betts, an archaeologist with the Canadian Museum of History who studies Paleo-Eskimo cultures in the Canadian Arctic. “What a beautiful way to view the world.”


It’s not clear exactly when people developed the technology that allowed them to begin hunting whales, but scholars generally believe Arctic whaling developed off the coast of Alaska sometime between 600 and 800 CE. For thousands of years before then, Arctic people survived by hunting seals, caribou, and walruses at the edge of the sea ice.

One such group, the Dorset—known in Inuit oral tradition as the Tunitwere rumored to have been so strong the men could outrun caribou and drag a 1,700-kilogram walrus across the ice. The women were said to have fermented raw seal meat against the warmth of their skin, leaving it in their pants for days at a time. But despite their legendary survival skills, the Tunit died out 1,000 years ago.An Inuit hunter sits on a whale that’s been hauled to shore for butchering in Point Hope, Alaska, in 1900. Photo by Hulton Deutsch/Getty Images

An Inuit hunter sits on a whale that’s been hauled to shore for butchering in Point Hope, Alaska, in 1900. Photo by Hulton Deutsch/Getty Images

One theory for their mysterious disappearance is that they were outcompeted by people who had begun to move east into the Canadian Arctic—migrants from Alaska who brought sealskin boats allowing them to push off from shore and hunt whales. Each spring, bowhead whales weighing up to 54,000 kilograms pass through the leads of water that open into the sea ice, and with skill and luck, the ancestors of today’s Inuit and Iñupiat people could spear a cetacean as it surfaced to breathe.

The advent of whaling changed the North. For the first time, hunters could bring in enough meat to feed an entire village. Permanent settlements began springing up in places like Utqiaġvik that were reliably visited by bowheads—places still inhabited today. Social organizations shifted as successful whale hunters amassed wealth, became captains, and positioned themselves at the top of a developing social hierarchy. Before long, the whale hunt became the center of cultural, spiritual, and day-to-day life, and whales the cornerstone of many Arctic and subarctic cosmologies.

When agricultural Europeans began visiting and writing about the North in the 10th century, they were mesmerized by Aboriginal peoples’ relationships with whales. Medieval literature depicted the Arctic as a land of malevolent “monstrous fishes” and people who could summon them to shore through magical powers and mumbled spells. Even as explorers and missionaries brought back straightforward accounts of how individual whaling cultures went about hunting, butchering, and sharing a whale, it was hard to shake the sense of mysticism. In 1938, American anthropologist Margaret Lantis analyzed these scattered ethnographic accounts and concluded that Iñupiat, Inuit, and other northern peoples belonged to a circumpolar “whale cult.”

Lantis found evidence of this in widespread taboos and rituals meant to cement the relationship between people and whales. In many places, a recently killed whale was given a drink of fresh water, a meal, and even traveling bags to ensure a safe journey back to its spiritual home. Individual whalers had their own songs to call the whales to them. Sometimes shamans performed religious ceremonies inside circles made of whale bones. Stashes of whaling amulets—an ambiguous word used to describe everything from carved, jewelry-like charms to feathers or skulls—were passed from father to son in whaling families.

To non-Indigenous observers, it was all so mysterious. So unknowable. And for archaeologists and biologists especially, it was at odds with Western scientific values, which prohibited anything that smacked of anthropomorphism.
A whaler waits for the bowhead whales from shore in Utqiaġvik, Alaska, during whaling season in the Chukchi Sea. Photo by Steven J. Kazlowski/Alamy Stock Photo

A whaler waits for the bowhead whales from shore in Utqiaġvik, Alaska, during whaling season in the Chukchi Sea. Photo by Steven J. Kazlowski/Alamy Stock Photo

In archaeology, such attitudes have limited our understanding of Arctic prehistory, says Erica Hill, a zooarchaeologist with the University of Alaska Southeast. Whaling amulets and bone circles were written off as ritualistic or supernatural with little exploration of what they actually meant to the people who created them. Instead, archaeologists who studied animal artifacts often focused on the tangible information they revealed about what ancient people ate, how many calories they consumed, and how they survived.

Hill is part of a burgeoning branch of archaeology that uses ethnographic accounts and oral histories to re-examine animal artifacts with fresh eyes—and interpret the past in new, non-Western ways. “I’m interested in this as part of our prehistory as humans,” Hill says, “but also in what it tells us about alternative ways of being.”


The idea that Indigenous people have spiritual relationships with animals is so well established in popular culture it’s cliché. Yet constricted by Western science and culture, few archaeologists have examined the record of human history with the perspective that animals feel emotions and can express those emotions to humans.

Hill’s interest in doing so was piqued in 2007, when she was excavating in Chukotka, Russia, just across the Bering Strait from Alaska. The site was estimated to be 1,000 to 2,000 years old, predating the dawn of whaling in the region, and was situated at the top of a large hill. As her team dug through the tundra, they uncovered six or seven intact walrus skulls deliberately arranged in a circle.

Like many archaeologists, Hill had been taught that ancient humans in harsh northern climates conserved calories and rarely expended energy doing things with no direct physical benefit. That people were hauling walrus skulls to a hilltop where there were plenty of similar-sized rocks for building seemed strange. “If you’ve ever picked up a walrus skull, they’re really, really heavy,” Hill says. So she started wondering: did the skulls serve a purpose that wasn’t strictly practical that justified the effort of carrying them uphill?

When Hill returned home, she began looking for other cases of “people doing funky stuff” with animal remains. There was no shortage of examples: shrines packed with sheep skulls, ceremonial burials of wolves and dogs, walrus-skull rings on both sides of the Bering Strait. To Hill, though, some of the most compelling artifacts came from whaling cultures.

Museum collections across North America, for instance, include a dazzling array of objects categorized as whaling amulets. From this grab bag, Hill identified 20 carved wooden objects. Many served as the seats of whaling boats. In the Iñupiaq language, they’re called either iktuġat or aqutim aksivautana, depending on dialect.

One in particular stands out. Hill was looking for Alaskan artifacts in a massive climate-controlled warehouse belonging to Smithsonian’s National Museum of Natural History in Washington, DC. The artifacts were housed in hundreds of floor-to-ceiling drawers, row after row of them, with little indication of what was inside. She pulled open one drawer and there it was—the perfect likeness of a bowhead whale staring back at her.

The object, likely from the late 19th century, probably functioned as a crosspiece. It was hewn from a hunk of driftwood into a crescent shape 21 centimeters long. Carved on one side was a bowhead, looking as it would look if you were gazing down on a whale from above, perhaps from a raven’s-eye perspective. A precious bead of obsidian was embedded in the blowhole. “It’s so elegant and simple but so completely whale,” Hill says. “It’s this perfect balance of minimalism and form.”

Sometime in the late 19th century, an Iñupiat carver fashioned this seat for an umiak out of driftwood, carving the likeness of a bowhead whale, its blowhole symbolized with a piece of obsidian. Photo by Department of Anthropology, Smithsonian Institute (Cat. A347918)Sometime in the late 19th century, an Iñupiaq carver fashioned this amulet for an umiak out of driftwood, carving the likeness of a bowhead whale, its blowhole symbolized with a piece of obsidian. As with other whaling amulets Erica Hill has examined, this object may have also functioned as part of the boat’s structure. Photo by Department of Anthropology, Smithsonian Institute (Cat. A347918)

Using Iñupiat oral histories and ethnographies recorded in the 19th and 20th centuries, Hill now knows that such amulets were meant to be placed in a boat with the likeness of the whale facing down, toward the ocean. The meticulously rendered art was thus meant not for humans, but for whales—to flatter them, Hill says, and call them to the hunters. “The idea is that the whale will be attracted to its own likeness, so obviously you want to depict the whale in the most positive way possible,” she explains.

Yupik stories from St. Lawrence Island tell of whales who might spend an hour swimming directly under an umiak, positioning themselves so they could check out the carvings and the men occupying the boat. If the umiak was clean, the carvings beautiful, and the men respectful, the whale might reposition itself to be harpooned. If the art portrayed the whale in an unflattering light or the boat was dirty, it indicated that the hunters were lazy and wouldn’t treat the whale’s body properly. Then the whale might swim away.

In “Sounding a Sea-Change: Acoustic Ecology and Arctic Ocean Governance” published in Thinking with Water, Shirley Roburn quotes Point Hope, Alaska, resident Kirk Oviok: “Like my aunt said, the whales have ears and are more like people,” he says. “The first batch of whales seen would show up to check which ones in the whaling crew would be more hospitable. … Then the whales would come back to their pack and tell them about the situation.”

The belief that whales have agency and can communicate their needs to people isn’t unique to the Arctic. Farther south, on Washington’s Olympic Peninsula and British Columbia’s Vancouver Island, Makah and Nuu-chah-nulth whalers observed eight months of rituals meant to communicate respect in the mysterious language of whales. They bathed in special pools, prayed, spoke quietly, and avoided startling movements that might offend whales. Right before the hunt, the whalers sang a song asking the whale to give itself.

In Makah and Nuu-chah-nulth belief, as in many Arctic cultures, whales weren’t just taken—they willingly gave themselves to human communities. A whale that offered its body wasn’t sentencing itself to death. It was choosing to be killed by hunters who had demonstrated, through good behavior and careful adherence to rituals, that they would treat its remains in a way that would allow it to be reborn. Yupik tradition, for example, holds that beluga whales once lived on land and long to return to terra firma. In exchange for offering itself to a Yupik community, a beluga expected to have its bones given the ritualistic treatment that would allow it to complete this transition and return to land, perhaps as one of the wolves that would gnaw on the whale’s bones.

According to Hill, many of the objects aiding this reciprocity—vessels used to offer whales a drink of fresh water, amulets that hunters used to negotiate relationships with animal spirits—weren’t just reserved for shamanistic ceremonies. They were part of everyday life; the physical manifestation of an ongoing, daily dialogue between the human and animal worlds.


While Westerners domesticated and eventually industrialized the animals we eat—and thus came to view them as dumb and inferior—Arctic cultures saw whale hunting as a match between equals. Bipedal humans with rudimentary technology faced off against animals as much as 1,000 times their size that were emotional, thoughtful, and influenced by the same social expectations that governed human communities. In fact, whales were thought to live in an underwater society paralleling that above the sea.

a bowhead whale swimming amid multi-layer sea ice

It’s difficult to assess populations of animals that swim under the ice, far from view, like bowhead whales. But experienced Iñupiat whalers are good at it. Photo by Steven Kazlowski/Minden Pictures

Throughout history, similar beliefs have guided other human-animal relationships, especially in hunter-gatherer cultures that shared their environment with big, potentially dangerous animals. Carvings left behind by the Tunit, for example, suggest a belief that polar bears possessed a kind of personhood allowing them to communicate with humans; while some Inuit believed walruses could listen to humans talking about them and react accordingly.

Whether or not those beliefs are demonstrably true, says Hill, they “make room for animal intelligence and feelings and agency in ways that our traditional scientific thinking has not.”

Today, as archaeologists like Hill and Matthew Betts shift their interpretation of the past to better reflect Indigenous worldviews, biologists too are shedding new light on whale behavior and biology that seems to confirm the traits Indigenous people have attributed to whales for more than 1,000 years. Among them is Hal Whitehead, a professor at Dalhousie University in Nova Scotia who argues that cetaceans have their own culture—a word typically reserved for human societies.

By this definition, culture is social learning that’s passed down from one generation to the next. Whitehead finds evidence for his theory in numerous recent studies, including one that shows bowhead whales in the North Pacific, off the Alaskan coast, and in the Atlantic Ocean near Greenland sing different songs, the way human groups might have different styles of music or linguistic dialects. Similarly, pods of resident killer whales living in the waters off south Vancouver Island greet each other with different behaviors than killer whales living off north Vancouver Island, despite the fact that the groups are genetically almost identical and have overlapping territories.

Plus, calves spend years with their mothers, developing the strong mother-offspring bonds that serve to transfer cultural information, and bowhead whales live long enough to accumulate the kind of environmental knowledge that would be beneficial to pass on to younger generations. We know this largely because of a harpoon tip that was found embedded in a bowhead in northern Alaska in 2007. This particular harpoon was only manufactured between 1879 and 1885 and wasn’t used for long after, meaning that the whale had sustained its injury at least 117 years before it finally died.

Other beliefs, too, are proving less farfetched than they once sounded. For years, scientists believed whales couldn’t smell, despite the fact that Iñupiat hunters claimed the smell of woodsmoke would drive a whale away from their camp. Eventually, a Dutch scientist dissecting whale skulls proved the animals did, indeed, have the capacity to smell. Even the Yupik belief that beluga whales were once land-dwelling creatures is rooted in reality: some 50 million years ago, the ancestor of modern-day whales walked on land. As if recalling this, whale fetuses briefly develop legs before losing them again.

An Inuit hunter sits on a whale that’s been hauled to shore for butchering in Point Hope, Alaska, in 1900. Photo by Hulton Deutsch/Getty ImagesInuit hunters in Utqiaġvik, Alaska, paddle an umiak after a bowhead whale. Photo by Galen Rowell/Getty Images

None of this suggests that whales freely give themselves to humans. But once you understand the biological and intellectual capabilities of whales—as whaling cultures surely did—it’s less of a leap to conclude that cetaceans live in their own underwater society, and can communicate their needs and wishes to humans willing to listen.


With the dawn of the 20th century and the encroachment of Euro-Americans into the North, Indigenous whaling changed drastically. Whaling in the Makah and Nuu-chah-nulth Nations essentially ended in the 1920s after commercial whalers hunted the gray whale to near extinction. In Chukotka, Russian authorities in the 1950s replaced community-based whaling with state-run whaling.

Even the whaling strongholds of Alaska’s Iñupiat villages weren’t immune. In the 1970s, the International Whaling Commission ordered a halt to subsistence bowhead whaling because US government scientists feared there were just 1,300 of the animals left. Harry Brower Sr. and other whaling captains who’d amassed lifetimes of knowledge knew that figure was wrong.

But unlike other whaling cultures, Iñupiat whalers had the means to fight back, thanks to taxes they had collected from a nearby oil boom. With the money, communities hired Western-trained scientists to corroborate traditional knowledge. The scientists developed a new methodology that used hydrophones to count bowhead whales beneath the ice, rather than extrapolating the population based on a count of the visible bowheads passing by a single, ice-free locale. Their findings proved bowheads were far more numerous than the government had previously thought, and subsistence whaling was allowed to continue.

Elsewhere, too, whaling traditions have slowly come back to life. In 1999, the Makah harvested their first whale in over 70 years. The Chukchi were allowed to hunt again in the 1990s.

Yet few modern men knew whales as intimately as Brower. Although he eschewed some traditions—he said he never wanted his own whaling song to call a harpooned whale to the umiak, for exampleBrower had other ways of communicating with whales. He believed that whales listened, and that if a whaler was selfish or disrespectful, whales would avoid him. He believed that the natural world was alive with animals’ spirits, and that the inexplicable connection he’d felt with whales could only be explained by the presence of such spirits.

And he believed that in 1986, a baby whale visited him in an Anchorage hospital to show him how future generations could maintain the centuries-long relationship between humans and whales. Before he died, he told his biographer Karen Brewster that although he believed in a Christian heaven, he personally thought he would go elsewhere. “I’m going to go join the whales,” he said. “That’s the best place, I think. … You could feed all the people for the last time.”

Perhaps Brower did become a whale and feed his people one last time. Or perhaps, through his deep understanding of whale biology and behavior, he passed down the knowledge that enabled his people to feed themselves for generations to come. Today, the spring whaling deadline he proposed based on his conversation with the baby whale is still largely observed, and bowhead whales continue to sustain Iñupiat communities, both physically and culturally.

Correction: This article has been updated to clarify the original purpose of the whaling amulet that caught Erica Hill’s attention in the Smithsonian warehouse.


Author bio Krista Lee Langlois is an independent journalist, essayist, and “aquaphile.” She lived in the Marshall Islands in 2006 and now writes about the intersection of people and nature from a landlocked cabin outside Durango, Colorado.

Os motivos por trás da Guerra dos Chimpanzés, a única registrada entre animais (BBC Brasil)

9 abril 2018Três chimpanzés do Parque Nacional de Gombe nos anos 1970

GEZA TELEKI. A eleição de um macaco do norte do Parque Nacional de Gombe como macho alfa causou tensão na comunidade de chimpanzés e, principalmente, com dois rivais, Charlie e Hugh

A única guerra civil documentada entre chimpanzés selvagens começou com um assassinato brutal.

Era janeiro de 1974, e um chimpanzé chamado Godi fazia sua refeição, sozinho, nos galhos de uma árvore no Parque Nacional de Gombe, na Tanzânia.

Mas Godi não reparou que, enquanto comia, oito macacos o rodearam. “Ele pulou da árvore e correu, mas eles o agarraram”, disse o primatologista britânico Richard Wrangham ao documentário da BBC The Demonic Ape (O Macaco Demoníaco, em tradução livre).”Um deles conseguiu agarrar um de seus pés, outro lhe prendeu pela mão. Ele foi imobilizado e surrado. O ataque durou mais de cinco minutos e, quando o deixaram, ele mal conseguia se mover.

“Godi nunca mais foi visto.

O episódio é conhecido como o início do que a famosa primatologista britânica Jane Goodall chamou de “A Guerra dos 4 Anos”, o conflito que dividiu uma comunidade de chimpanzés em Gombe e desatou uma onda de assassinatos e violência que, desde então, nunca mais foi registrada.

Mão de um chimpanzé

GETTY IMAGES. O assassinato brutal do primata Godi marcou o início da sangrenta “Guerra de 4 anos” dos chimpanzés em Gombe

No entanto, o motivo exato e a causa da divisão são um “eterno mistério”, disse Joseph Feldblum, professor de antropologia evolutiva da Universidade de Duke, nos Estados Unidos, em um comunicado da instituição.

No mês passado, Feldblum liderou um estudo publicado na revista científica American Journal of Physical Anthropology que revela a história de “poder, ambição e ciúmes” que deu origem à guerra entre os primatas.

 

Macacos e humanos

Feldblum está há 25 anos arquivando e digitalizando as anotações que Goodall fez durante seus mais de 55 anos vivendo no Parque Nacional de Gombe.

A primatologista, que na última terça-feira completou 84 anos, mudou tudo o que acreditávamos saber sobre os chimpanzés (e sobre os seres humanos) ao descobrir que esses macacos fabricavam e usavam ferramentas, tinham uma linguagem primitiva e eram capazes de entender o que seus pares pensavam.

Mas Goodall também descobriu a crueldade que esses animais podiam demonstrar.

Jane Goodall com seu famoso boneco em 2018

GETTY IMAGES. A primatologista Jane Goodall, que lidera uma fundação de pesquisa e conservação com seu nome, acompanhou toda a guerra dos chimpanzés nos anos 1970

Foram quatro anos documentando saques, surras e assassinatos entre as facções Kasakela e Kahama, que ficavam ao norte e ao sul do parque, respectivamente.

Nesse tempo, por exemplo, um terço das mortes de chimpanzés machos em Gombe foram perpetreadas pelos próprios animais.

A guerra, disse Goodall no documentário da BBC, “só fez com que os chimpanzés se parecessem ainda mais conosco do que se pensava”.

A violência foi tão excessiva e única que alguns investigadores sugeriram que ela foi provocada involuntariamente pela própria Goodall, que montou uma estação de observação no local onde os animais recebiam alimentos.

De acordo com essas teorias, “as duas comunidades de chimpanzés poderiam ter existido o tempo todo ou estavam se dissolvendo quando Goodall começou sua pesquisa, e a estação de alimentação os reuniu em uma trégua temporária até que eles se separaram novamente”, disse o comunicado da Universidade de Duke.

“Mas os novos resultados de uma equipe de Duke e da Universidade Estadual do Arizona sugerem que alguma coisa a mais estava acontecendo.”

Chimpanzés brigando

GETTY IMAGES. Os chimpanzés são capazes de violência, mas pesquisadores dizem que o ocorrido entre 1974 e 1978 excedeu todos os registros de brutalidade

 

Amigos e inimigos

No novo estudo, os pesquisadores analisaram as mudanças nas alianças entre 19 chimpanzés machos durante os sete anos anteriores à guerra.

Para isso, elaboraram mapas detalhados das redes sociais dos primatas, nas quais os machos eram considerados amigos se fossem vistos chegando juntos à estação de alimentação com maior frequência.

“Sua análise sugere que, durante os primeiros anos, entre 1967 e 1970, os machos do grupo original estavam misturados”, disse Duke.

Foi aí que a comunidade começou a se dividir: enquanto alguns passavam mais tempo no norte, outros estavam a maior parte do tempo no sul.

Em 1972, a socialização entre os machos já ocorria exclusivamente dentro das facções Kasakela ou Kahama.

Silhueta de um chimpanzé

GETTY IMAGES. Ao ver chegar os macacos do sul, os do norte “subiam nas árvores, havia muitos gritos e demonstrações de poder”, diz um novo estudo sobre o episódio

Ao se encontrarem, eles começavam a atirar galhos uns nos outros, a gritar ou fazer outras demonstrações de força.

“Escutávamos gritos do sul e dizíamos: ‘Os machos do sul estão vindo!'”, relembra Anne Pusey, professora de antropologia evolutiva da Universidade de Duke que esteve em Gombe com Goodall e é coautora do estudo atual.

“Nessa hora, todos os machos do norte subiam nas árvores e ouvíamos muitos gritos e demonstrações de poder.”

Três suspeitos

A partir do momento que ocorreu a divisão entre os grupos, os pesquisadores acreditam que o conflito surgiu por causa de “uma luta pelo poder entre três machos de alta categoria”: Humphrey, um macho alfa recém-coroado pelo grupo do norte, e seus rivais do sul, Charlie e Hugh.

Chimpanzé sofrendo

GETTY IMAGES. Violência entre três machos líderes afetou toda a rede de vínculos sociais, sem distinguir idade nem sexo

“Humphrey era grande e se sabia que ele atirava pedras, o que era assustador. Ele conseguia intimidar Charlie e Hugh separadamente, mas, quando estavam juntos, ele se mantinha fora do caminho”, diz Pussey no comunicado da universidade.

Durante quatro anos, o grupo de Humphrey destruiu o grupo do sul, e diversos machos “rebeldes” morreram ou desapareceram. O maior dos grupos invadia sistemativamente o território alheio e, se encontrasse um chimpanzé rival, o atacava cruelmente e o deixava morrer em decorrência dos ferimentos.

De acordo com a pesquisa, a disponibilidade de fêmeas foi mais baixa do que o normal nesse período, o que provavelmente exacerbou a luta pelo domínio do território.

A violência, por sua vez, não se limitou a esses três machos rivais, mas afetou toda a rede de vínculos sociais dos primatas, sem distinguir idade nem sexo.

Os pesquisadores reconhecem que a falta de outros eventos semelhantes na natureza torna mais difícil comparar os novos resultados, mas o trabalho pode trazer certa paz a Goodall.

“A situação foi terrível”, disse a britânica, reconhecendo que sua estação de observação de fato pode ter “aumentado a violência” entre os primatas.

“Acho que a parte mais triste foi ter observado a sequência de eventos em que uma comunidade maior aniquilou por completo a menor e tomou seu território.”

So killer whales can talk. Welcome to a brave new world of cross-species chat (The Guardian)

Opinion

Wikie the orca is more mimic than raconteur, but the potential is awesome. Imagine dolphins tackling politicians on pollution

A killer whale.

Abridge in cultures has occurred. A cognitive chasm between intelligent creatures has been crossed. Of all the spectacular times for you to be alive, you happen to have been born in an age when killer whales started talking to the damn dirty apes who were willing to listen. Though this sounds like some sort of sci-fi dream/nightmare, I am here to assure you that this is real. Remain calm, but stay vigilant around all marine mammals at this time. We may be in for a rocky time, as you shall discover.

Let us begin by examining the facts. First, it’s true. As you may have heard by now, a captive killer whale called Wikie, housed at Marineland in Antibes, France, is uttering noises that mimic the human sounds “Hello” and “Bye-bye” as well as “One, two, three” plus, apparently, the haunting word “Amy” – the name of its trainer. Predictably, within hours of the release of the scientific paper, Wikie has become something of an online celebrity.

This week, after the news broke about Wikie’s great feat, a number of vocal animal welfare charities were calling for her release from captivity. This troubled me a little. Really? I thought. Is that really a good idea?

Killer whales (like all dolphins) are adept at horizontal learning, after all. They copy one another. They have sounds for objects, possibly names. They have dialects. They transmit behaviours. In other words, they have culture like we do. Might the once captive Wikie somehow spoil their untamed wildness with her newly learned human vernacular? What if this captive dolphin, somehow released into the wild with a human greeting (“Hello!”) should corrupt the wild dolphins it comes across? What then? I dread to think, but the idea is entertaining to consider so let us do just that.

Let us imagine pods of wild dolphins screaming “Goodbye” at boatloads of tourists that encroach on their hunting grounds each year. Imagine them saying “Bye-bye” to trawlers. Imagine them ruining countless nature documentaries by screaming “Hello” to BBC camera crews while filming.

And what if Wikie and her kind later develop sarcasm? Can you imagine, in an age where our oceans become bereft and depleted of nutrition, the words “So long and thanks for all the fish!”, delivered in a sarcastic tone? In a perverse sort of way, I suspect Douglas Adams would have laughed long and loud at this idea. And then wept.

Listen to killer whales mimicking human voices – audio

But there are positives to this possible cross-species dialogue, and perhaps it is this potential that we should focus on. Imagine a non-human animal that could speak up – in human words – against the degradation of a vast ecosystem like that of the oceans? In such a world, perhaps modern politics would find itself a new enemy in marine mammals like Wikie. One can imagine, for instance, in some alternative universe, a language-endowed Wikie being invited to speak at Davos or some other God-awful international event.

One can imagine the soundbites (“Amy?”); the 7.45am BBC Breakfast interview; the cosy press conferences with Wikie, wide-eyed in a giant blow-up birthing pool in front of the cameras, next to a shady foreign president secretly plotting her kind’s political downfall while sipping imported water from a non-recyclable plastic bottle. (While writing this it strikes me how, in moments like these, just how so many of us would side with these talkative killer whales). But alas, such imaginative scenarios are just that – imaginative.

You knew this bit was coming. It is time to burst the bubble about this female killer whale. Wikie has a kind of magic about her, but it is not yet a two-way conversation. She is a mimic, pure and simple and she is hungry for her fish rewards. In the same way as a 14-year-old can armpit-fart his way through Bach’s Fifth Symphony to achieve 1,000-plus views on YouTube, without ever truly knowing Bach, this killer whale has hit upon a neat trick for reward by exhaling in a measured way that sounds a little like human voice.

But that doesn’t make the science hogwash. Far from it. It’s a beginning. And all scientific journeys have a beginning. We’ll need wild, untainted, unspoiled populations to test ideas on. We need to get away from fish rewards. We need to move away from captive research. This is a start. It’s not the end. They may one day talk with us, but not like this.

And so, in my wildest dreams it won’t be a “bye-bye” or a “hello” that curries favour with an intelligent species such as the killer whale, but a word of more depth: a word like “friend” or “partner” or “respect”. And further down the line maybe we could manage something else. Dialogue. Truth. Meaning.

As of recent times, these are no longer uniquely human concepts when it comes to zoology. Welcome to the brave new world. You happen to be alive in it. But who else is listening? Increasingly, we shall get to decide. Bye-bye, or hello: you and I get to choose.

Jules Howard is a zoologist and the author of Sex on Earth, and Death on Earth

Orcas can imitate human speech, research reveals (The Guardian)

Killer whales able to copy words such as ‘hello’ and ‘bye bye’ as well as sounds from other orcas, study shows

High-pitched, eerie and yet distinct, the sound of a voice calling the name “Amy” is unmistakable. But this isn’t a human cry – it’s the voice of a killer whale called Wikie.

New research reveals that orcas are able to imitate human speech, in some cases at the first attempt, saying words such as “hello”, “one, two” and “bye bye”.

The study also shows that the creatures are able to copy unfamiliar sounds produced by other orcas – including a sound similar to blowing a raspberry.

Scientists say the discovery helps to shed light on how different pods of wild killer whales have ended up with distinct dialects, adding weight to the idea that they are the result of imitation between orcas. The creatures are already known for their ability to copy the movements of other orcas, with some reports suggesting they can also mimic the sounds of bottlenose dolphins and sea lions.

“We wanted to see how flexible a killer whale can be in copying sounds,” said Josep Call, professor in evolutionary origins of mind at the University of St Andrews and a co-author of the study. “We thought what would be really convincing is to present them with something that is not in their repertoire – and in this case ‘hello’ [is] not what a killer whale would say.”

Wikie is not the first animal to have managed the feat of producing human sounds: dolphins, elephants, parrots, orangutans and even beluga whales have all been captured mimicking our utterances, although they use a range of physical mechanisms to us to do so. Noc, the beluga whale, made novel use of his nasal cavities, while Koshik, an Indian elephant jammed his trunk in his mouth, resulting in the pronouncement of Korean words ranging from “hello” to “sit down” and “no”.

But researchers say only a fraction of the animal kingdom can mimic human speech, with brain pathways and vocal apparatus both thought to determine whether it is possible.

“That is what makes it even more impressive – even though the morphology [of orcas] is so different, they can still produce a sound that comes close to what another species, in this case us, can produce,” said Call.

He poured cold water, however, on the idea that orcas might understand the words they mimic. “We have no evidence that they understand what their ‘hello’ stands for,” he said.

Writing in the journal Proceedings of the Royal Society B: Biological Sciences, researchers from institutions in Germany, UK, Spain and Chile, describe how they carried out the latest research with Wikie, a 14-year-old female orca living in an aquarium in France. She had previously been trained to copy actions performed by another orca when given a human gesture.

After first brushing up Wikie’s grasp of the “copy” command, she was trained to parrot three familiar orca sounds made by her three-year old calf Moana.

Wikie was then additionally exposed to five orca sounds she had never heard before, including noises resembling a creaking door and the blowing a raspberry.

Finally, Wikie was exposed to a human making three of the orca sounds, as well as six human sounds, including “hello”, “Amy”, “ah ha”, “one, two” and “bye bye”.

“You cannot pick a word that is very complicated because then I think you are asking too much – we wanted things that were short but were also distinctive,” said Call.

Throughout the study, Wikie’s success was first judged by her two trainers and then confirmed from recordings by six independent adjudicators who compared them to the original sound, without knowing which was which.

The team found that Wikie was often quickly able to copy the sounds, whether from an orca or a human, with all of the novel noises mimicked within 17 trials. What’s more, two human utterances and all of the human-produced orca sounds were managed on the first attempt – although only one human sound – “hello” – was correctly produced more than 50% of the time on subsequent trials.

The matching was further backed up through an analysis of various acoustic features from the recordings of Wikie’s sounds.

While the sounds were all made and copied when the animals’ heads were out of the water, Call said the study shed light on orca behaviour.

“I think here we have the first evidence that killer whales may be learning sounds by vocal imitation, and this is something that could be the basis of the dialects we observe in the wild – it is plausible,” said Call, noting that to further test the idea, trials would have to be carried out with wild orcas.

Diana Reiss, an expert in dolphin communication and professor of psychology at Hunter College, City University of New York, welcomed the research, noting that it extends our understanding of orcas’ vocal abilities, with Wikie able to apply a “copy” command learned for imitation of actions to imitation of sounds.

Dr Irene Pepperberg, an expert in parrot cognition at Harvard University, also described the study as exciting, but said: “A stronger test would have been whether the various sounds produced could be correctly classified by humans without the models present for comparison.”

Language is learned in brain circuits that predate humans (Georgetown University)

PUBLIC RELEASE: 

GEORGETOWN UNIVERSITY MEDICAL CENTER

WASHINGTON — It has often been claimed that humans learn language using brain components that are specifically dedicated to this purpose. Now, new evidence strongly suggests that language is in fact learned in brain systems that are also used for many other purposes and even pre-existed humans, say researchers in PNAS (Early Edition online Jan. 29).

The research combines results from multiple studies involving a total of 665 participants. It shows that children learn their native language and adults learn foreign languages in evolutionarily ancient brain circuits that also are used for tasks as diverse as remembering a shopping list and learning to drive.

“Our conclusion that language is learned in such ancient general-purpose systems contrasts with the long-standing theory that language depends on innately-specified language modules found only in humans,” says the study’s senior investigator, Michael T. Ullman, PhD, professor of neuroscience at Georgetown University School of Medicine.

“These brain systems are also found in animals – for example, rats use them when they learn to navigate a maze,” says co-author Phillip Hamrick, PhD, of Kent State University. “Whatever changes these systems might have undergone to support language, the fact that they play an important role in this critical human ability is quite remarkable.”

The study has important implications not only for understanding the biology and evolution of language and how it is learned, but also for how language learning can be improved, both for people learning a foreign language and for those with language disorders such as autism, dyslexia, or aphasia (language problems caused by brain damage such as stroke).

The research statistically synthesized findings from 16 studies that examined language learning in two well-studied brain systems: declarative and procedural memory.

The results showed that how good we are at remembering the words of a language correlates with how good we are at learning in declarative memory, which we use to memorize shopping lists or to remember the bus driver’s face or what we ate for dinner last night.

Grammar abilities, which allow us to combine words into sentences according to the rules of a language, showed a different pattern. The grammar abilities of children acquiring their native language correlated most strongly with learning in procedural memory, which we use to learn tasks such as driving, riding a bicycle, or playing a musical instrument. In adults learning a foreign language, however, grammar correlated with declarative memory at earlier stages of language learning, but with procedural memory at later stages.

The correlations were large, and were found consistently across languages (e.g., English, French, Finnish, and Japanese) and tasks (e.g., reading, listening, and speaking tasks), suggesting that the links between language and the brain systems are robust and reliable.

The findings have broad research, educational, and clinical implications, says co-author Jarrad Lum, PhD, of Deakin University in Australia.

“Researchers still know very little about the genetic and biological bases of language learning, and the new findings may lead to advances in these areas,” says Ullman. “We know much more about the genetics and biology of the brain systems than about these same aspects of language learning. Since our results suggest that language learning depends on the brain systems, the genetics, biology, and learning mechanisms of these systems may very well also hold for language.”

For example, though researchers know little about which genes underlie language, numerous genes playing particular roles in the two brain systems have been identified. The findings from this new study suggest that these genes may also play similar roles in language. Along the same lines, the evolution of these brain systems, and how they came to underlie language, should shed light on the evolution of language.

Additionally, the findings may lead to approaches that could improve foreign language learning and language problems in disorders, Ullman says.

For example, various pharmacological agents (e.g., the drug memantine) and behavioral strategies (e.g., spacing out the presentation of information) have been shown to enhance learning or retention of information in the brain systems, he says. These approaches may thus also be used to facilitate language learning, including in disorders such as aphasia, dyslexia, and autism.

“We hope and believe that this study will lead to exciting advances in our understanding of language, and in how both second language learning and language problems can be improved,” Ullman concludes.

Cultura primata (Revista Fapesp)

Transmissão de práticas de uso de ferramentas por macacos-prego ajuda a repensar o papel das tradições na evolução

MARIA GUIMARÃES | ED. 259 | SETEMBRO 2017

Podcast: Eduardo Ottoni

Com uma pedra erguida acima da cabeça, o jovem Porthos bate vigorosamente no chão arenoso de modo a abrir um buraco. Seu objetivo: uma aranha, que logo consegue desentocar e rola entre as mãos para tontear a presa que em seguida come. Ele é um macaco-prego da espécie Sapajus libidinosus, habitante do Parque Nacional Serra da Capivara, no Piauí, e objeto de estudo de pesquisadores do Instituto de Psicologia da Universidade de São Paulo (IP-USP). O biólogo Tiago Falótico tem caracterizado o uso de ferramentas por esses animais (ver Pesquisa FAPESP nº 196) e mostrou, em artigo publicado em julho na revista Scientific Reports, que a ação do jovem macho envolve conhecimento, aprendizado e transmissão de práticas culturais – ou tradições, como alguns preferem chamar quando os sujeitos não são humanos – dentro de grupos sociais. A pesquisa está no bojo de um corpo teórico que busca entrelaçar biologia, ciências sociais e humanas e recém-desembocou na formação da Sociedade de Evolução Cultural. Sua reunião inaugural acaba de acontecer na Alemanha, entre 13 e 15 de setembro.

Até agora, o uso de pedras como ferramentas para cavar só foi documentado nessa população. Especialmente quando se trata de desentocar aranhas, é preciso experiência. O estudo, resultado de observações feitas durante o doutorado de Falótico, encerrado em 2011 sob orientação do biólogo Eduardo Ottoni, mostra que quase 60% dos adultos e jovens (como Porthos) têm sucesso na tarefa. Macacos juvenis (o correspondente a crianças), por outro lado, só conseguem em pouco mais de 30% dos casos. Isso acontece porque é preciso reconhecer o revestimento de seda que fecha a toca do aracnídeo, sinal de que o habitante está lá dentro. “Os juvenis às vezes cavam uma toca que acabou de ser aberta por outro macaco”, conta Falótico. Estruturas subterrâneas, parecidas com batatas, da planta conhecida como farinha-seca (Thiloa glaucocarpa), também são desenterradas com mais eficiência pelos adultos. Já as raízes de louro (Ocotea), outro alimento desses primatas, apesar de envolverem o uso de pedras maiores, não parecem apresentar um desafio especial para os aprendizes. Macacos dos dois sexos se mostraram igualmente capazes de cavar com pedras, com uma taxa de sucesso equivalente, embora eles pareçam ter mais interesse pela atividade: entre as 1.702 situações observadas, 77% envolviam machos e apenas 23%, fêmeas.

“Esperávamos encontrar uma correlação entre o uso de ferramentas e a escassez de alimentos, mas não foi o que vimos”, conta Falótico. Se os macacos da serra da Capivara encontram algo comestível que exija o uso de ferramentas, recorrem a elas. Seu modo de vida, em que passam metade do tempo no chão rodeados de pedras e gravetos, parece ser propício ao desenvolvimento das habilidades. Mas não é só isso. Embora não haja diferença entre os sexos nos hábitos alimentares, as fêmeas nunca usam gravetos – que seus companheiros masculinos utilizam para desentocar lagartos de frestas e retirar insetos de troncos, por exemplo. Há diferença apenas, aparentemente, no interesse. “Quando um macho vê outro usar uma vareta, ele observa atento; já uma fêmea, mesmo que esteja ao lado daquele usando a ferramenta, não se interessa e olha para o outro lado!”

Os macacos da mesma espécie que habitam a fazenda Boa Vista, em Gilbués, cerca de 300 quilômetros (km) para sudoeste, têm tradições distintas no uso de ferramentas. Ali, uma área com mais influência de Cerrado do que Caatinga, as pedras são menos abundantes, mas necessárias (e usadas) para quebrar cocos. Gravetos estão por toda parte, mas não têm uso. Essa diferença cultural entre grupos de macacos foi explorada em um experimento feito pelo psicólogo Raphael Moura Cardoso durante o doutorado, orientado por Eduardo Ottoni, e relatado em artigo de 2016 na Biology Letters. Eles puseram – tanto na fazenda Boa Vista como na serra da Capivara – caixas de acrílico recheadas de melado de cana. O único jeito de retirar a guloseima era por meio de uma fenda no alto com largura suficiente apenas para varetas. “Na serra da Capivara, um macho logo acertou uma pedrada na caixa”, lembra Ottoni, que, previdente, tinha planejado o aparato “à prova de macaco-prego”. “Quando nada aconteceu, ele largou a pedra, coçou a cabeça e pegou um graveto.” Ele brinca que nem precisou editar o vídeo para mostrar em um congresso – foi uma ação contínua e imediata. Ao longo de cinco dias de exposição à caixa, 10 dos 14 machos usaram o graveto logo na primeira sessão, e apenas os três mais jovens não foram bem-sucedidos. Os demais conseguiram um sucesso de 90% na empreitada. As fêmeas não tentaram, assim como os macacos da fazenda Boa Vista. Lá, os pesquisadores até tentaram ajudar: depois de seis horas expostos à tarefa, os macacos deparavam com um graveto já fincado na fenda. Mesmo tirando e lambendo o melado da ponta, nenhum deles voltou a inserir a ferramenta na caixa ao longo de 13 dias de experimento. Uma surpresa foi que os macacos da Boa Vista, exímios quebradores de coco, não tentaram partir a caixa. “Eu esperava isso deles, não dos outros”, diz Ottoni.

Aprendizado social

Os resultados, surpreendentes, podem reforçar a importância da transmissão de tradições entre os macacos. A capa da edição de 25 de julho deste ano da revista PNAS traz justamente a foto de um macaco-prego da fazenda Boa Vista comendo uma castanha que conseguiu quebrar com a ajuda de uma grande pedra redonda, observado de perto por um jovem. A imagem anuncia a coletânea especial sobre como a cultura se conecta à biologia, da qual faz parte um artigo do grupo liderado pelas primatólogas Patrícia Izar, do IP-USP, Dorothy Fragaszy, da Universidade da Georgia, nos Estados Unidos, e Elisabetta Visalberghi, do Instituto de Ciências e Tecnologias Cognitivas, na Itália, sobre os macacos da fazenda Boa Vista, que estudam sistematicamente desde 2006. Nas observações recolhidas ao longo desse tempo, chama a atenção a tolerância dos adultos em relação aos jovens aprendizes que olham de perto e até comem pedaços dos cocos partidos. “Os adultos competem pelos recursos e os imaturos podem ficar perto”, conta Patrícia. As análises publicadas no artigo recente mostram muito mais do que proximidade: os quebradores de coco influenciam a atividade dos outros, sobretudo os jovens, que também começam a manipular pedras e cocos. Isso dura alguns minutos. “A tradição canaliza a atividade para o mesmo tipo de ação importante para essa tradição”, define.

Patrícia ressalta que os macacos nascem nesse contexto. “Muitas vezes vemos filhotes nas costas das mães enquanto elas quebram”, conta. Com esse aprendizado contínuo, acabam se tornando especialistas na tarefa. Mas não basta observar, e daí a importância de os filhotes serem atraídos pela ação dos adultos – principalmente os mais eficazes. “O sucesso passa pela percepção da tarefa e das propriedades da ferramenta”, detalha, descrevendo um complexo corpo-ferramenta em que é constantemente necessário ajustar força, gestos e postura. Quando quebram tucum, um coquinho menos resistente, os macacos ajustam a força das pancadas depois de ouvirem o som da superfície rachando, o grupo mostrou em artigo do ano passado na Animal Behaviour. Para cocos mais difíceis, eles escolhem pedras que podem chegar a ser mais pesadas do que o próprio corpo. E a seleção da pedra é criteriosa, conforme mostrou um experimento em que Patrícia e seu grupo forneceram pedras artificiais com diferentes tamanhos, pesos e densidades. As pedras grandes logo atraíam a atenção dos macacos, mas se fossem pouco densas – mais leves do que aparentavam – eram abandonadas. “Eles têm a percepção de que o peso é importante na quebra”, diz Patrícia.

Tolerância: macho adulto da fazenda Boa Vista come castanha partida observado de perto por jovem

Essas sociedades primatas alteram o ambiente. Macacos escolhem pedras ou troncos achatados como base para quebrar coco, e para lá carregam as raras pedras grandes e duras que encontram no ambiente. Essa conformação é importante não só por criar oficinas de quebra, mas por canalizar a possibilidade de aprendizado, já que todos sabem onde a atividade acontece e pode ser observada. “Não faz sentido pensar em maturação motora independente do contexto social, alimentar”, afirma a bióloga Briseida Resende, também do IP-USP e coautora do artigo da PNAS. O desenvolvimento individual depende das experiências de cada um, de suas capacidades físicas e do acervo acumulado pelo grupo, no qual uma inovação criada pode se disseminar, perpetuar-se e fazer parte da cultura mantida por gerações. Resende defende que indivíduo e sociedade são indissociáveis, embora historicamente tenham sido vistos como entidades distintas.

Teoria revista

Reunir a evolução cultural e a biológica é justamente o foco da síntese estendida, agora sedimentada com a fundação, em 2016, da Sociedade de Evolução Cultural – o primeiro presidente é o zoólogo Peter Richerson, da Universidade da Califórnia em Davis, cujo grupo privilegia a estatística. Essa visão conjunta amplia o olhar evolutivo, já que a transmissão de ideias ou inovações não se dá apenas de pais para filhos e pode trazer vantagens seletivas favorecendo as capacidades cognitivas e sociais relevantes. Considera também que a cultura pode influenciar aspectos físicos, como a conformação e o tamanho do cérebro, ou o desenvolvimento de habilidades que por sua vez sedimentam o comportamento. Os genes e a cultura, duas vias de transmissão de informação, relacionam-se, portanto, por uma via de mão dupla.

Jovens aprendizes tentam tirar proveito de escavação feita por fêmea

A oportunidade de ver comportamentos surgirem e se espalhar é rara, e por isso abordagens experimentais que provocam inovações são um acréscimo importante aos comportamentos diversos dos macacos-prego do Piauí. Ferramentas estatísticas recentes podem ajudar a aprofundar essa compreensão, como a Análise de Difusão Baseada em Redes (Network-Based Diffusion Analysis) que o grupo de Ottoni começa a usar. “O programa monta uma rede social aleatória e compara à real”, explica o pesquisador, que torna as análises mais robustas inserindo características medidas nos sujeitos em causa. Em agosto de 2016 ele apresentou, no congresso da Sociedade Primatológica Internacional, em Chicago, resultados do experimento feito pela bióloga Camila Coelho durante doutorado orientado por ele com um período passado na Universidade de Durham, no Reino Unido, para aprender o método. Os resultados indicam que, no caso dos macacos-prego, o aprendizado social prevê a difusão de informação na espécie.

Até meio século atrás, o uso de ferramentas era considerado privilégio humano. Ao observar chimpanzés na Tanzânia, a inglesa Jane Goodall derrubou essa exclusividade e, de certa maneira, causou a redefinição das fronteiras entre gente e bicho. Muito se descobriu de lá para cá, mas falar em cultura animal ainda esbarra em certo desconforto. Talvez não por muito mais tempo.

O uso de pedras para escavar só foi descrito na serra da Capivara

Sob o comando de hormônios

O cuidado com os filhotes está ligado ao hormônio oxitocina em mamíferos. O grupo liderado por Maria Cátira Bortolini, da Universidade Federal do Rio Grande do Sul, descreveu há poucos anos as variações na molécula de oxitocina em espécies de macacos nas quais há bons pais (ver Pesquisa FAPESP 228). Ensaios farmacológicos feitos no laboratório do bioquímico Claudio Costa-Neto, da Faculdade de Medicina de Ribeirão Preto da USP, agora desvendaram o caminho da oxitocina dentro das células e verificaram que os receptores das formas alteradas ficam mais expostos nas membranas das células, de maneira que o sistema não se dessensibiliza. “É como se o macaco recebesse constantemente a instrução ‘tenho que cuidar dos filhotes’”, explica Cátira. Faz diferença para a sobrevivência de saguis, que frequentemente têm filhotes gêmeos, por exemplo.

O resultado está em artigo publicado em agosto na PNAS, que também descreve o resultado da aplicação dessas oxitocinas em ratos por meio de borrifadas nasais, experimento realizado em colaboração com o fisiologista Aldo Lucion, da UFRGS. As fêmeas lactantes, já inundadas de oxitocina, alteraram pouco o comportamento. Mas os machos tratados com o hormônio alteraram radicalmente o hábito de ignorar os filhotes e correram para cheirá-los, uma reação que foi três vezes mais rápida com a oxitocina de sagui.

Os cebídeos, família que inclui os macacos-prego, também têm um tipo de oxitocina que aumenta a propensão à paternidade ativa. Os grupos de Cátira e de Ottoni recentemente iniciaram uma colaboração para investigar as características genéticas em machos mais e menos cuidadores. “Já conseguimos extrair material genético de amostras de fezes e estamos selecionando genes candidatos a serem rastreados”, conta ela, fascinada com a tolerância dos machos e as habilidades cognitivas dos primatas do Piauí. “A capacidade de inovar, por um lado, e a de sentar e observar, por outro, são necessárias para o desenvolvimento e a transmissão de traços culturais adaptativos e certamente há um cenário genético por trás disso.”

Projetos
1. Uso de ferramentas por macacos-prego (Sapajus libidinosus) selvagens: Ecologia, aprendizagem socialmente mediada e tradições comportamentais (nº 14/04818-0); Modalidade Projeto Temático; Pesquisador responsável Eduardo Benedicto Ottoni (USP); Investimento R$ 609.276,69.2. Variabilidade de comportamento social de macacos-prego (gênero Cebus): Análise comparativa entre populações para investigação de correlatos fisiológicos (nº 08/55684-3); Modalidade Auxílio à Pesquisa – Regular; Pesquisadora responsável Patrícia Izar (USP); Investimento R$ 186.187,33.
3. Desenvolvimento de novos ligantes/drogas com ação agonística seletiva (biased agonism) para receptores dos sistemas renina-angiotensina e calicreínas-cininas: Novas propriedades e novas aplicações biotecnológicas (nº 12/20148-0); ModalidadeProjeto Temático; Pesquisador responsável Claudio Miguel da Costa Neto (USP); Investimento R$ 3.169.674,21.

Artigos científicos
FALÓTICO, T. et alDigging up food: excavation stone tool use by wild capuchin monkeysScientific Reports. v. 7, n. 1, 6278. 24 jul. 2017.
CARDOSO, R. M. e OTTONI, E. B. The effects of tradition on problem solving by two wild populations of bearded capuchin monkeys in a probing task. Biology Letters. v. 12, n. 11, 20160604. nov. 2016.
FRAGASZY, D. M. et alSynchronized practice helps bearded capuchin monkeys learn to extend attention while learning a traditionPNAS. v. 114, n. 30, p. 7798-805. 25 jul. 2017.
MANGALAM, M., Izar, et alTask-specific temporal organization of percussive movements in wild bearded capuchin monkeysAnimal Behaviour. v. 114, p. 129–137. abr. 2016.
PARREIRAS-E-SILVA, L. T. et alFunctional new world monkey oxytocin forms elicit na altered signaling profile and promotes parental care in ratsPNAS. v. 114, n. 34, p. 9044-49. 22 ago. 2017.
VISALBERGHI, E. et al. Selection of effective stone tools by wild bearded capuchin monkeys (Cebus libidinosus)Current Biology, v. 19, n. 3, p. 213-17. 10 fev. 2009.

Morre na Flórida a orca Tilikum, que inspirou o documentário “Blackfish” (Correio Brasiliense)

A fama internacional de Tilikum começou em 2010, quando, durante uma acrobacia, matou sua treinadora

Postado em 06/01/2017 16:38

A orca Tilikum, estrela do SeaWorld e protagonista do aclamado documentário “Blackfish”, que denunciou o sofrimento dos animais em cativeiro em atrações do gênero, morreu nesta sexta-feira após sofrer uma infecção bacteriana, anunciou o parque temático da Flórida em um comunicado.

A orca macho de 36 anos sofria de “graves problemas de saúde” e ainda se não pode determinar exatamente a causa da morte, segundo a empresa. Entre outros problemas, seus veterinários detectaram uma infecção bacteriana nos pulmões.

“Tilikum tinha, e ainda tem, um lugar especial no coração da família SeaWorld, assim como nos corações de milhões de pessoas ao redor do mundo que inspirou”, disse Joel Manby, presidente do parque de Orlando, no centro da Flórida.

A fama internacional de Tilikum começou em 2010, quando, durante uma acrobacia, matou sua treinadora.

“A vida de Tilikum estará sempre ligada à perda de nossa amiga e colega Dawn Bancheau”, escreveu a empresa no texto publicado em seu site. “Enquanto todos nós sofremos grande tristeza por essa perda, continuamos oferecendo a Tilikum o melhor cuidado possível”.

A morte de Dawn é mencionada no filme de 2013, que ganhou o prêmio Bafta de Melhor Documentário, como um efeito do estresse sofrido por orcas em cativeiro por viver em pequenos tanques e com pouca luz.

A empresa sofreu uma avalanche de críticas após o filme e multiplicaram-se as chamadas para o fechamento desses parques aquáticos.

Finalmente, em março de 2016, SeaWorld anunciou que iria parar a criação de orcas e que sua atual geração desses mamíferos em cativeiro seria a última. A decisão foi aplaudida por organizações de defesa dos animais.

“Tilikum estava perto do fim da expectativa média de vida de baleias orcas do sexo masculino, de acordo com um estudo científico independente”, disse o SeaWorld nesta sexta-feira, relatando ainda que as bactérias que atingiram o animal são encontradas “em hábitats naturais e instalações de zoológicos”.

Com a perda de Tilikum, o SeaWorld tem agora 22 orcas em seus três parques em Orlando, San Antonio (Texas) e San Diego (Califórnia).

Por France Presse

A New Origin Story for Dogs (The Atlantic)

 

June 2, 2016

The first domesticated animals may have been tamed twice.

Katie Salvi

ED YONG

Tens of thousands of years ago, before the internet, before the Industrial Revolution, before literature and mathematics, bronze and iron, before the advent of agriculture, early humans formed an unlikely partnership with another animal—the grey wolf. The fates of our two species became braided together. The wolves changed in body and temperament. Their skulls, teeth, and paws shrank. Their ears flopped. They gained a docile disposition, becoming both less frightening and less fearful. They learned to read the complex expressions that ripple across human faces. They turned into dogs.

Today, dogs are such familiar parts of our lives—our reputed best friends and subject of many a meme—that it’s easy to take them, and what they represent, for granted. Dogs were the first domesticated animals, and their barks heralded the Anthropocene. We raised puppies well before we raised kittens or chickens; before we herded cows, goats, pigs, and sheep; before we planted rice, wheat, barley, and corn; before we remade the world.

“Remove domestication from the human species, and there’s probably a couple of million of us on the planet, max,” says archaeologist and geneticist Greger Larson. “Instead, what do we have? Seven billion people, climate change, travel, innovation and everything. Domestication has influenced the entire earth. And dogs were the first.” For most of human history, “we’re not dissimilar to any other wild primate. We’re manipulating our environments, but not on a scale bigger than, say, a herd of African elephants. And then, we go into partnership with this group of wolves. They altered our relationship with the natural world.”

Larson wants to pin down their origins. He wants to know when, where, and how they were domesticated from wolves. But after decades of dogged effort, he and his fellow scientists are still arguing about the answers. They agree that all dogs, from low-slung corgis to towering mastiffs, are the tame descendants of wild ancestral wolves. But everything else is up for grabs.

Some say wolves were domesticated around 10,000 years ago, while others say 30,000. Some claim it happened in Europe, others in the Middle East, or East Asia. Some think early human hunter-gatherers actively tamed and bred wolves. Others say wolves domesticated themselves, by scavenging the carcasses left by human hunters, or loitering around campfires, growing tamer with each generation until they became permanent companions.

Dogs were domesticated so long ago, and have cross-bred so often with wolves and each other, that their genes are like “a completely homogenous bowl of soup,” Larson tells me, in his office at the University of Oxford. “Somebody goes: what ingredients were added, in what proportion and in what order, to make that soup?” He shrugs his shoulders. “The patterns we see could have been created by 17 different narrative scenarios, and we have no way of discriminating between them.”

The only way of doing so is to look into the past. Larson, who is fast-talking, eminently likable, and grounded in both archaeology and genetics, has been gathering fossils and collaborators in an attempt to yank the DNA out of as many dog and wolf fossils as he can. Those sequences will show exactly how the ancient canines relate to each other and to modern pooches. They’re the field’s best hope for getting firm answers to questions that have hounded them for decades.

And already, they have yielded a surprising discovery that could radically reframe the debate around dog domestication, so that the big question is no longer when it happened, or where, but how many times.

*    *   *

On the eastern edge of Ireland lies Newgrange, a 4,800-year-old monument that predates Stonehenge and the pyramids of Giza. Beneath its large circular mound and within its underground chambers lie many fragments of animal bones. And among those fragments, Dan Bradley from Trinity College Dublin found the petrous bone of a dog.

Press your finger behind your ear. That’s the petrous. It’s a bulbous knob of very dense bone that’s exceptionally good at preserving DNA. If you try to pull DNA out of a fossil, most of it will come from contaminating microbes and just a few percent will come from the bone’s actual owner. But if you’ve got a petrous bone, that proportion can be as high as 80 percent. And indeed, Bradley found DNA galore within the bone, enough to sequence the full genome of the long-dead dog.

Larson and his colleague Laurent Frantz then compared the Newgrange sequences with those of almost 700 modern dogs, and built a family tree that revealed the relationships between these individuals. To their surprise, that tree had an obvious fork in its trunk—a deep divide between two doggie dynasties. One includes all the dogs from eastern Eurasia, such as Shar Peis and Tibetan mastiffs. The other includes all the western Eurasian breeds, and the Newgrange dog.

The genomes of the dogs from the western branch suggest that they went through a population bottleneck—a dramatic dwindling of numbers. Larson interprets this as evidence of a long migration. He thinks that the two dog lineages began as a single population in the east, before one branch broke off and headed west. This supports the idea that dogs were domesticated somewhere in China.

But there’s a critical twist.

The team calculated that the two dog dynasties split from each other between 6,400 and 14,000 years ago.  But the oldest dog fossils in both western and eastern Eurasia are older than that. Which means that when those eastern dogs migrated west into Europe, there were already dogs there.

To Larson, these details only make sense if dogs were domesticated twice.

Here’s the full story, as he sees it. Many thousands of years ago, somewhere in western Eurasia, humans domesticated grey wolves. The same thing happened independently, far away in the east. So, at this time, there were two distinct and geographically separated groups of dogs. Let’s call them Ancient Western and Ancient Eastern. Around the Bronze Age, some of the Ancient Eastern dogs migrated westward alongside their human partners, separating from their homebound peers and creating the deep split in Larson’s tree. Along their travels, these migrants encountered the indigenous Ancient Western dogs, mated with them (doggy style, presumably), and effectively replaced them.

Today’s eastern dogs are the descendants of the Ancient Eastern ones. But today’s western dogs (and the Newgrange one) trace most of their ancestry to the Ancient Eastern migrants. Less than 10 percent comes from the Ancient Western dogs, which have since gone extinct.

This is a bold story for Larson to endorse, not least because he himself has come down hard on other papers suggesting that cows, sheep, or other species were domesticated twice. “Any claims for more than one need to be substantially backed up by a lot of evidence,” he says. “Pigs were clearly domesticated in Anatolia and in East Asia. Everything else is once.” Well, except maybe dogs.

*   *   *

Katie Salvi

Other canine genetics experts think that Larson’s barking up the wrong tree. “I’m somewhat underwhelmed, since it’s based on a single specimen,” says Bob Wayne from the University of California, Los Angeles. He buys that there’s a deep genetic division between modern dogs. But, it’s still possible that dogs were domesticated just once, creating a large, widespread, interbreeding population that only later resolved into two distinct lineages.

In 2013, Wayne’s team compared the mitochondrial genomes (small rings of DNA that sit outside the main set) of 126 modern dogs and wolves, and 18 fossils. They concluded that dogs were domesticated somewhere in Europe or western Siberia, between 18,800 and 32,100 years ago. And genes aside, “the density of fossils from Europe tells us something,” says Wayne. “There are many things that look like dogs, and nothing quite like that in east Asia.”

Peter Savolainen from the KTH Royal Institute of Technology in Stockholm disagrees. By comparing the full genomes of 58 modern wolves and dogs, his team has shown that dogs in southern China are the most genetically diverse in the world. They must have originated there around 33,000 years ago, he says, before a subset of them migrated west 18,000 years later.

That’s essentially the same story that Larson is telling. The key difference is that Savolainen doesn’t buy the existence of an independently domesticated group of western dogs. “That’s stretching the data very much,” he says. Those Ancient Western dogs might have just been wolves, he says. Or perhaps they were an even earlier group of migrants from the east. “I think the picture must seem a bit chaotic,” he says understatedly. “But for me, it’s pretty clear. It must have happened in southern East Asia. You can’t interpret it any other way.”

Except, you totally can. Wayne does (“I’m certainly less dogmatic than Peter,” he says). Adam Boyko from Cornell University does, too: after studying the genes of village dogs—free-ranging mutts that live near human settlements—he argued for a single domestication in Central Asia, somewhere near India or Nepal. And clearly, Larson does as well.

Larson adds that his gene-focused peers are ignoring one crucial line of evidence—bones. If dogs originated just once, there should be a neat gradient of fossils with the oldest ones at the center of domestication and the youngest ones far away from it. That’s not what we have. Instead, archaeologists have found 15,000-year-old dog fossils in western Europe, 12,500-year-old ones in east Asia, and nothing older than 8,000 years in between.

“If we’re wrong, then how on earth do you explain the archaeological data?” says Larson. “Did dogs jump from East Asia to Western Europe in a week, and then go all the way back 4,000 years later?” No. A dual domestication makes more sense. Mietje Genompré, an archaeologist from the Royal Belgian Institute of Natural Sciences, agrees that the bones support Larson’s idea. “For me, it’s very convincing,” she says.

But even Larson is hedging his bets. When I ask him how strong his evidence is, he says, “Like, put a number on it? If was being bold, I’d say it’s a 7 out of 10. We lack the smoking gun.”

Why is this is so hard? Of all the problems that scientists struggle with, why has the origin of dogs been such a bitch to solve?

For starters, the timing is hard to pin down because no one knows exactly how fast dog genomes change. That pace—the mutation rate—underpins a lot of genetic studies. It allows scientists to compare modern dogs and ask: How long ago must these lineages have diverged in order to build up this many differences in their genes? And since individual teams use mutation rate estimates that are wildly different, it’s no wonder they’ve arrive at conflicting answers.

Regardless of the exact date, it’s clear that over thousands of years, dogs have mated with each other, cross-bred with wolves, travelled over the world, and been deliberately bred by humans. The resulting ebb and flow of genes has turned their history into a muddy, turbid mess—the homogeneous soup that Larson envisages.

Wolves provide no clarity. Grey wolves used to live across the entire Northern Hemisphere, so they could have potentially been domesticated anywhere within that vast range (although North America is certainly out). What’s more, genetic studies tell us that no living group of wolves is more closely related to dogs than any other, which means that the wolves that originally gave rise to dogs are now extinct. Sequencing living wolves and dogs will never truly reveal their shrouded past; it’d be, as Larson says, like trying to solve a crime when the culprit isn’t even on the list of suspects.

“The only way to know for sure is to go back in time,” he adds.

*    *   *

Katie Salvi

The study informally known as the Big Dog Project was born of frustration. Back in 2011, Larson was working hard on the origin of domestic pigs, and became annoyed that scientists studying dogs were getting less rigorous papers in more prestigious journals, simply because their subjects were that much more charismatic and media-friendly. So he called up his longstanding collaborator Keith Dobney. “Through gritted teeth, I said: We’re fucking doing dogs. And he said: I’m in.”

Right from the start, the duo realized that studying living dogs would never settle the great domestication debate. The only way to do that was to sequence ancient DNA from fossil dogs and wolves, throughout their range and at different points in history. While other scientists were studying the soup of dog genetics by tasting the finished product, Larson would reach back in time to taste it at every step of its creation, allowing him to definitively reconstruct the entire recipe.

In recent decades, scientists have become increasingly successful at extracting and sequencing strands of DNA from fossils. This ancient DNA has done wonders for our understanding of our own evolution. It showed, for example, how Europe was colonized 40,000 years ago by hunter-gatherers moving up from Africa, then 8,000 years ago by Middle Eastern farmers, and 5,000 years ago by horse-riding herders from the Russian steppes. “Everyone in Europe today is a blend of those three populations,” says Larson, who hopes to parse the dog genome in the same way, by slicing it into its constituent ingredients.

Larson originally envisaged a small project—just him and Dobney analyzing a few fossils. But he got more funding, collaborators, and samples than he expected. “It just kind of metastasized out of all proportion,” he says. He and his colleagues would travel the world, drilling into fossils and carting chips of bone back to Oxford. They went to museums and private collections. (“There was a guy up in York who had a ton of stuff in his garage.”) They grabbed bones from archaeological sites.

The pieces of bone come back to a facility in Oxford called the Palaeo-BARN—the Palaeogenomics and Bioarchaeology Research Network. When I toured the facility with Larson, we wore white overalls, surgical masks, oversoles, and purple gloves, to keep our DNA (and that of our skin microbes) away from the precious fossil samples. Larson called them ‘spacesuits.’ I was thinking ‘thrift-store ninja.’

In one room, the team shoves pieces of bone into a machine that pounds it with a small ball bearing, turning solid shards into fine powder. They then send the powder through a gauntlet of chemicals and filters to pull out the DNA and get rid of everything else. The result is a tiny drop of liquid that contains the genetic essence of a long-dead dog or wolf. Larson’s freezer contains 1,500 such drops, and many more are on the way. “It’s truly fantastic the kind of data that he has gathered,” says Savolainen.

True to his roots in archaeology, Larson isn’t ignoring the bones. His team photographed the skulls of some 7,000 prehistoric dogs and wolves at 220 angles each, and rebuilt them in virtual space. They can use a technique called geometric morphometrics to see how different features on the skulls have evolved over time.

The two lines of evidence—DNA and bones—should either support or refute the double domestication idea. It will also help to clear some confusion over a few peculiar fossils, such as a 36,000 year old skull from Goyet cave in Belgium. Genompré thinks it’s a primitive dog. “It falls outside the variability of wolves: it’s smaller and the snout is different,” she says. Others say it’s too dissimilar to modern dogs. Wayne has suggested that it represents an aborted attempt at domestication—a line of dogs that didn’t contribute to modern populations and is now extinct.

Maybe the Goyet hound was part of Larson’s hypothetical Ancient Western group, domesticated shortly after modern humans arrived in Europe. Maybe it represented yet another separate flirtation with domestication. All of these options are on the table, and Larson thinks he has the data to tell them apart. “We can start putting numbers on the difference between dogs and wolves,” he says. “We can say this is what all the wolves at this time period look like; does the Goyet material fall within that realm, or does it look like dogs from later on?”

Larson hopes to have the first big answers within six to twelve months. “I think it’ll clearly show that some things can’t be right, and will narrow down the number of hypotheses,” says Boyko. “It may narrow it down to one but I’m not holding my breath on that.” Wayne is more optimistic. “Ancient DNA will provide much more definitive data than we had in the past,” he says. “[Larson] convinced everyone of that. He’s a great diplomat.”

Indeed, beyond accumulating DNA and virtual skulls, Larson’s greatest skill is in gathering collaborators. In 2013, he rounded up as many dog researchers as he could and flew them to Aberdeen, so he could get them talking. “I won’t say there was no tension,” he says. “You go into a room with someone who has written something that sort of implies you aren’t doing very good science… there will be tension. But it went away very quickly. And, frankly: alcohol.”

“Everyone was like: You know what? If I’m completely wrong and I have to eat crow on this, I don’t give a shit. I just want to know.”

A single-celled organism capable of learning (Science Daily)

Date:
April 27, 2016
Source:
CNRS
Summary:
For the first time, scientists have demonstrated that an organism devoid of a nervous system is capable of learning. Biologists have succeeded in showing that a single-celled organism, the protist, is capable of a type of learning called habituation. This discovery throws light on the origins of learning ability during evolution, even before the appearance of a nervous system and brain. It may also raise questions as to the learning capacities of other extremely simple organisms such as viruses and bacteria.

The slime mold Physarum polycephalum (diameter: around 10 centimeters), made up of a single cell, was here cultivated in the laboratory on agar gel. Credit: Audrey Dussutour (CNRS)

For the first time, scientists have demonstrated that an organism devoid of a nervous system is capable of learning. A team from the Centre de Recherches sur la Cognition Animale (CNRS/Université Toulouse III — Paul Sabatier) has succeeded in showing that a single-celled organism, the protist Physarum polycephalum, is capable of a type of learning called habituation. This discovery throws light on the origins of learning ability during evolution, even before the appearance of a nervous system and brain. It may also raise questions as to the learning capacities of other extremely simple organisms such as viruses and bacteria. These findings are published in the Proceedings of the Royal Society B on 27 April 2016.

An ability to learn, and memory are key elements in the animal world. Learning from experiences and adapting behavior accordingly are vital for an animal living in a fluctuating and potentially dangerous environment. This faculty is generally considered to be the prerogative of organisms endowed with a brain and nervous system. However, single-celled organisms also need to adapt to change. Do they display an ability to learn? Bacteria certainly show adaptability, but it takes several generations to develop and is more a result of evolution. A team of biologists thus sought to find proof that a single-celled organism could learn. They chose to study the protist, or slime mold, Physarum polycephalum, a giant cell that inhabits shady, cool areas[1] and has proved to be endowed with some astonishing abilities, such as solving a maze, avoiding traps or optimizing its nutrition[2]. But until now very little was known about its ability to learn.

During a nine-day experiment, the scientists thus challenged different groups of this mold with bitter but harmless substances that they needed to pass through in order to reach a food source. Two groups were confronted either by a “bridge” impregnated with quinine, or with caffeine, while the control group only needed to cross a non-impregnated bridge. Initially reluctant to travel through the bitter substances, the molds gradually realized that they were harmless, and crossed them increasingly rapidly — behaving after six days in the same way as the control group. The cell thus learned not to fear a harmless substance after being confronted with it on several occasions, a phenomenon that the scientists refer to as habituation. After two days without contact with the bitter substance, the mold returned to its initial behavior of distrust. Furthermore, a protist habituated to caffeine displayed distrustful behavior towards quinine, and vice versa. Habituation was therefore clearly specific to a given substance.

Habituation is a form of rudimentary learning, which has been characterized in Aplysia (an invertebrate also called sea hare)[3]. This form of learning exists in all animals, but had never previously been observed in a non-neural organism. This discovery in a slime mold, a distant cousin of plants, fungi and animals that appeared on Earth some 500 million years before humans, improves existing understanding of the origins of learning, which markedly preceded those of nervous systems. It also offers an opportunity to study learning types in other very simple organisms, such as viruses or bacteria.

[1] This single cell, which contains thousands of nuclei, can cover an area of around a square meter and moves within its environment at speeds that can reach 5 cm per hour.

[2] See “Even single-celled organisms feed themselves in a ‘smart’ manner.” https://www.sciencedaily.com/releases/2010/02/100210164712.htm

[3] Mild tactile stimulation of the animal’s siphon normally causes the defensive reflex of withdrawing the branchiae. If the harmless tactile stimulation is repeated, this reflex diminishes and finally disappears, thus indicating habituation.


Journal Reference:

  1. Romain P. Boisseau, David Vogel, Audrey Dussutour. Habituation in non-neural organisms: evidence from slime mouldsProceedings of the Royal Society B: Biological Sciences, 2016; 283 (1829): 20160446 DOI: 10.1098/rspb.2016.0446