African hominid fossils show ancient steps toward a two-legged stride

New cache of Ardipithecus ramidus bones reveals advances in upright walking 4 million years ago

Ardipithecus ramidus ankle bone

WALKING TALL  A researcher holds an Ardipithecus ramidus ankle bone after its discovery at an East African site not far from where Ardi, a partial skeleton of the same species, was found previously.

S.W. Simpson

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