First example of whispering observed in non-human primates
Researchers noticed tamarin monkeys communicating with each other at a 'reduced amplitude' in the presence of zoo staff they disliked
Your support helps us to tell the story
From reproductive rights to climate change to Big Tech, The Independent is on the ground when the story is developing. Whether it's investigating the financials of Elon Musk's pro-Trump PAC or producing our latest documentary, 'The A Word', which shines a light on the American women fighting for reproductive rights, we know how important it is to parse out the facts from the messaging.
At such a critical moment in US history, we need reporters on the ground. Your donation allows us to keep sending journalists to speak to both sides of the story.
The Independent is trusted by Americans across the entire political spectrum. And unlike many other quality news outlets, we choose not to lock Americans out of our reporting and analysis with paywalls. We believe quality journalism should be available to everyone, paid for by those who can afford it.
Your support makes all the difference.The first example of whispering by non-human primates has been observed amongst a group of tamarin monkeys in captivity in New York City’s Central Park Zoo.
The group of cotton-top tamarins were being observed in order to study their use of human-directed mobbing calls (signals made by groups of prey to confuse and intimidate predators).
However, scientists observed that when a particularly disliked member of zoo staff entered the tamarins’ habitation the primates did not make mobbing calls but instead communicated with one another using “low amplitude vocalizations”.
The research concluded that “the tamarins were reducing the amplitude of their vocalizations in the context of exposure to a potential threat”. In other words the primates - like many humans - felt it was prudent to keep quiet when a disliked or dangerous individual was around.
The zoo keeper in question had been involved in the capture of the tamarins, with the family of five previously exhibiting "a strong mobbing response" in his presence.
Tamarins are squirrel-sized monkeys found in the tropical rainforests of Central and South America. They can live for up to 18 years in groups of up to 40 individuals.
Cotton-tail tamarins (which typically weigh around 0.5kg each) have been extensively studied, with the research describing the species as “highly cooperative and vocal” with command of “a repertoire of call types [used] in contexts of feeding, group cohesion, investigation, mild alarm, and high arousal”.
The paper, published in the journal of Zoo Biology, describes the tamarins' range of calls as including “whistles, chirps, squeaks, chevron chatters, and trills”.
The primates under observation were cotton top tamarins, a species that is known to have a range of anti-predator tactics including “alarm calling, freezing, escape, and mobbing”. However, this was the first time that whispering has been observed in any non-human primate.
Join our commenting forum
Join thought-provoking conversations, follow other Independent readers and see their replies
Comments