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Chimpanzees and Bonobos
Charlie puts the branch over his head and puts it behind his back as far as possible away from Hugh. Hugh doesn't do anything, he just finishes his mouthful and then he turns to Charlie and grooms him. So this very polite way of saying, will you groom me, please, has worked. And bonobos on the left bank of the Congo River are a like a domesticated form of a chimpanzee but obviously humans didn't domesticate them. They're self-domesticated; they show all the marks of domestication that domesticated animals do in their bones.