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common chimpanzee, the bonobo is the closest extant relative to humans. As the two species are not proficient swimmers, the natural formation of the Congo River (around 1.5-2 million years ago) possibly led to the isolation and speciation of the bonobo. Bonobos live south of the river, and thereby were separated from the ancestors of the common chimpanzee, which live north of the river. There are no

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