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Orrorin lived about 6 million years ago, while Ardipithecus remains have been dated to 5.8-4.4 million years ago.

At present, the vote is still out as to whether any of these three primates were in fact true hominins and if they were our ancestors.

He based this on the fact that the natural range of our nearest living relatives, chimpanzees and gorillas, is limited to Africa.

He concluded that we ultimately must have shared a now extinct common ancestor with those apes in Africa.

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This second, more conservative line of early hominins died out by 1 million years ago or shortly before then.

The classification of Sahelanthropus has been the most in question.

Land 3 million to about 3.6 million years ago. Africa. Adds Meave Leakey of the National. Thanks to an. fossils of a chimp-sized ape dated to about 4.4 million.… continue reading »

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The origins of bipedalism to some four million years ago. BY MEAVE LEAKEY AND ALAN WALKER. “Early Hominid Fossils from Africa,” Meave Leakey and Alan.… continue reading »

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