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Bonobos will happily share their food with a stranger, and even give up their own meal — but only if the stranger offers them social interaction, evolutionary anthropologists at Duke University report in the journal PLoS One. The researchers, Jingzhi Tan and Brian Hare, say their findings may shed light on the origins of altruism in humans.

Along with chimpanzees, bonobos are among the closest primates to humans. Chimpanzees, however, do not display similar behavior toward strangers.