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Orangutans use mime to make themselves understood
Videos show apes released back into the wild make mimicking gestures to convey information or as a trick
Ian Sample, science correspondent
The Guardian, Wednesday 11 August 2010
Orangutans use mime to help make themselves understood, according to video recordings of the apes in the wild.
Footage of rehabilitated orangutans released into a Borneo forest show the apes mimicking actions such as cracking open termite mounds, washing themselves and using a leaf to clean a wounded foot.
The study suggests they are capable of more complex communication than previously thought, and resort to mimes to elaborate on messages directed at other apes and their former keepers.
In some recordings, orangutans used gestures to distract or mislead others. One animal indicated to researchers that it wanted a haircut, as a ruse to divert their attention while it stole something, according to the study.
Another tried to use a stick to get termites from a nest, but feigned failure in a bid to attract help, the researchers claim.
Psychologist Anne Russon and Kristin Andrews, a philosopher at York University in Toronto, analysed 20 years of video footage of orangutans that had once been in captivity, but were released into the wild in Indonesian Borneo.
They found 18 scenes in which orangutans appeared to be acting out simple mimes to convey information to other animals or people. Of these, 14 mimes were addressed to researchers working with the apes, while four were directed at other orangutans.
The study, published in the Biology Letters journal, suggests miming is rare in wild orangutans, but is used when other forms of communication fail.
Andrews said: "Great apes' ability to engage in rudimentary narrative communication suggests to us that, like humans, they are able to make sense of their world by telling stories, and to relay their thoughts about the world to others."Previous studies have described a gorilla acting as though it was rolling a ball of clay between her hands, which was interpreted as meaning "clay". A language-trained orangutan was also observed blowing through its thumb and forefinger to express the word "balloon".
The researchers write: "These orangutan and other great ape pantomime cases indicate that pantomime serves multiple purposes and supports important communicative complexities in living great apes. For great apes, like humans, pantomime is a medium, not a message."