Touching, embracing and kissing before stressful events may be an ancient way of building trust, according to scientists studying the behaviour of our closest ape relatives.
Researchers at Durham University, England, studied chimpanzees and bonobos using physical contact to reassure each other ahead of conflicts over food.
One of the most surprising findings was that chimpanzees, despite their reputation for aggression, engaged in close contact, including placing fingers in one another’s mouths.
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