May 19, 2025 05:53 PM
(This post was last modified: May 19, 2025 07:19 PM by C C.)
More "monkey see, monkey do" enlightenment about superficial human customs.
Q: "Why has your generation switched from sporting the usual useless tattoos and bling piercings to instead carrying around stolen infants?"
A: "I'm hip. I'm hip."
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Capuchin monkeys develop bizarre “fad” of abducting baby howlers
https://www.eurekalert.org/news-releases/1083539
EXCERPTS: On an island off the coast of Panama lives a population of wild primates with a remarkable culture. White-faced capuchins on Jicarón Island in Coiba National Park use stone tools; and scientists have been monitoring this unique tradition with an array of motion-triggered cameras on the island since 2017. In 2022, doctoral researcher Zoë Goldsborough was looking through the camera trap footage when she found an unusual sighting, something they had never seen in the previous five years of data: a capuchin monkey carrying an infant howler monkey on his back.
“It was so weird that I went straight to my advisor’s office to ask him what it was,” remembers Goldsborough who is conducting her dissertation at MPI-AB. The biologists knew it was a rare animal behavior and so they immediately started investigating. If there was to be more evidence of this occurring on the island, they were confident they would find it: “We had all the footage from cameras on Jicarón for the whole year,” says Brendan Barrett, a group leader at MPI-AB and Goldsborough’s advisor, “so we could reconstruct the scene to see if this weird behavior was just a one-off, or something bigger.”
[...] the course of 15 months, these five capuchins carried 11 different howler monkeys for up to 9-day periods. The camera footage showed the howler babies clinging to the backs or bellies of their young male carriers who appeared to be going about their normal business of travelling or using tools to crack open food sources. The researchers collated the footage on an interactive website documenting the spread of the behavior.
“The complete timeline tells us a fascinating story of one individual who started a random behavior, which was taken up with increasing speed by other young males,” says Barrett. The authors describe this as a social tradition or cultural fad—a behavior that spreads in a population through social learning. It parallels trends observed in other animals, such as killer whales donning “salmon hats” or chimpanzees wearing a blade of grass in their ears like an accessory.
The implications of the capuchins’ fashion fad, however, are more than skin deep. The howler babies, all less than four weeks old, appear to have been abducted from their parents who were captured on camera calling to infants from nearby trees. Four babies were observed to have perished. The authors suspect that none of the babies survived. "The capuchins didn’t hurt the babies,” stresses Goldsborough, “but they couldn’t provide the milk that infants need to survive.”
As is often the case in the natural world, one animal’s loss is another animal’s gain. But what the capuchins gain from this social tradition is a mystery. The males don’t eat the infants, they don’t play with them, and they don’t receive more attention from their group mates while carrying an infant. “We don’t see any clear benefit to the capuchins,” says Goldsborough “but we also don’t see any clear costs, although it might make tool use a little trickier.”
The research offers the first known documentation of a social tradition in which animals repeatedly abduct and carry infants of another species—without any clear benefit to themselves. It highlights the ways in which animal culture can parallel our own. Says Barrett: “We show that non-human animals also have the capacity to evolve cultural traditions without clear functions but with destructive outcomes for the world around them.” (MORE - details)
PAPER: http://dx.doi.org/10.1016/j.cub.2025.03.056
Q: "Why has your generation switched from sporting the usual useless tattoos and bling piercings to instead carrying around stolen infants?"
A: "I'm hip. I'm hip."
- - - - - - - - - - - - - -
Capuchin monkeys develop bizarre “fad” of abducting baby howlers
https://www.eurekalert.org/news-releases/1083539
EXCERPTS: On an island off the coast of Panama lives a population of wild primates with a remarkable culture. White-faced capuchins on Jicarón Island in Coiba National Park use stone tools; and scientists have been monitoring this unique tradition with an array of motion-triggered cameras on the island since 2017. In 2022, doctoral researcher Zoë Goldsborough was looking through the camera trap footage when she found an unusual sighting, something they had never seen in the previous five years of data: a capuchin monkey carrying an infant howler monkey on his back.
“It was so weird that I went straight to my advisor’s office to ask him what it was,” remembers Goldsborough who is conducting her dissertation at MPI-AB. The biologists knew it was a rare animal behavior and so they immediately started investigating. If there was to be more evidence of this occurring on the island, they were confident they would find it: “We had all the footage from cameras on Jicarón for the whole year,” says Brendan Barrett, a group leader at MPI-AB and Goldsborough’s advisor, “so we could reconstruct the scene to see if this weird behavior was just a one-off, or something bigger.”
[...] the course of 15 months, these five capuchins carried 11 different howler monkeys for up to 9-day periods. The camera footage showed the howler babies clinging to the backs or bellies of their young male carriers who appeared to be going about their normal business of travelling or using tools to crack open food sources. The researchers collated the footage on an interactive website documenting the spread of the behavior.
“The complete timeline tells us a fascinating story of one individual who started a random behavior, which was taken up with increasing speed by other young males,” says Barrett. The authors describe this as a social tradition or cultural fad—a behavior that spreads in a population through social learning. It parallels trends observed in other animals, such as killer whales donning “salmon hats” or chimpanzees wearing a blade of grass in their ears like an accessory.
The implications of the capuchins’ fashion fad, however, are more than skin deep. The howler babies, all less than four weeks old, appear to have been abducted from their parents who were captured on camera calling to infants from nearby trees. Four babies were observed to have perished. The authors suspect that none of the babies survived. "The capuchins didn’t hurt the babies,” stresses Goldsborough, “but they couldn’t provide the milk that infants need to survive.”
As is often the case in the natural world, one animal’s loss is another animal’s gain. But what the capuchins gain from this social tradition is a mystery. The males don’t eat the infants, they don’t play with them, and they don’t receive more attention from their group mates while carrying an infant. “We don’t see any clear benefit to the capuchins,” says Goldsborough “but we also don’t see any clear costs, although it might make tool use a little trickier.”
The research offers the first known documentation of a social tradition in which animals repeatedly abduct and carry infants of another species—without any clear benefit to themselves. It highlights the ways in which animal culture can parallel our own. Says Barrett: “We show that non-human animals also have the capacity to evolve cultural traditions without clear functions but with destructive outcomes for the world around them.” (MORE - details)
PAPER: http://dx.doi.org/10.1016/j.cub.2025.03.056