Aggression, such a costly habit, wouldn't have been so necessary. That last common ancestor suddenly had the southern jungles to themselves.Īs a result, competition for resources wouldn't be as fierce as before. A massive drought drove gorillas from the south, and they never returned. ![]() But why and how could natural selection tame the bonobo? One possible narrative begins about 2.5 million years ago, when the last common ancestor of bonobos and chimpanzees lived both north and south of the Zaire River, as did gorillas, their ecological rivals. According to Hare and study co-author Richard Wrangham, one of the world's foremost primatologists, these are likely signs of domestication.
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