Fossil hunters exploring the eastern edge of the Rift Valley of Kenya have found the jawbone of a 10-million-year-old ape that appears to be a close relative of the last ancestor of humans, chimpanzees, and gorillas. The discovery of this ancient ape strikes a new blow against a theory that apes in Africa died out millions of years ago only to be replaced by other apes that had migrated to Europe and Asia and then returned.
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