Hominid species landscape. Artwork of hominid species coexisting around 1.9 to 1.6 million years ago in east Africa. Three Homo habilis are in the tree in the foreground, some Australopithecus robustus are at the water's edge, Homo rudolfensis are at the edge of the savannah and Homo ergaster are hunting on the savannah. All of these species flourished in the lower paleolithic (old stone age), 2.5 million to 120,000 years ago, but Homo ergaster is the only one thought to be the direct ancestor of modern humans.
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