Evrim Yazgin
Cosmos science journalist
Marmosets do something that only humans, dolphins and elephants have been known to do: give each other names.
“Phee-calls” – a specific vocal call – used to identify and communicate between individual marmosets are described in new research published in the journal Science.
There are 22 species of marmoset native to South America and occasionally spotted in Central America. The generally live in small family groups of 2 to 8 individuals.
The common marmoset weighs just a few hundred grams and is about 19cm tall. They are easily recognised by their large, white ear tuffs.
Naming other individuals is a highly advanced cognitive skill in social animals. Interestingly, our closest evolutionary relatives, non-human primates, have until now appeared to lack this ability.
Researchers uncovered the phee-calls in marmosets by recording their conversations.
They found that, not only do the little monkeys use phee-calls to address specific individuals, they are also able to tell when a call was directed at them and responded more accurately when it was.
“This discovery highlights the complexity of social communication among marmosets,” explains study lead and senior author David Omer from the Hebrew University of Jerusalem. “These calls are not just used for self-localisation, as previously thought – marmosets use these specific calls to label and address specific individuals.”
The researchers also noticed marmosets within a family group used similar vocal labels to address different individuals. Adult marmosets were even able to learn the names of individuals they weren’t related to by blood.
Such vocalisations may help marmosets in dense rainforest habitats where visibility is limited.
“Marmosets live in small monogamous family groups and take care of their young together, much like humans do,” says Omer. “These similarities suggest that they faced comparable evolutionary social challenges to our early pre-linguistic ancestors, which might have led them to develop similar communicating methods.”
Understanding how social communication developed in marmosets could help explain human language evolution.
In the Spring edition of Cosmos Magazine, Drew Rooke looks at the prospects of talking to whales, and Amalyah Hart looks at insect consciousness. Out September 26.
