Orangutans hand it to researchers
Orangutans try to communicate by gesturing in the same way as people do, researchers find.
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In a series of sessions with captive female orangutans, Richard Byrne and his colleagues at the University of St. Andrews in Scotland offered individual animals a whole serving of a favorite food, a half serving, or a food that the apes didn’t prefer. The scientists recorded signals that the animals made before food appeared, when it was offered, and after the food was given over.