Fossil finds have since pushed back the ability of hominids to walk on two legs by millions of years.
Anthropologist D. Carl Johanson … has discovered a skull fragment, shin and thigh bones of a 3-million-year-old man in Ethiopia…. The bones belonged to an ape man of the genus.… “We have absolute, concrete evidence that our ancestors walked on two legs over 3 million years ago,” the 30-year-old scientist told a news conference.
Exactly when upright walking emerged in the evolutionary history of humans remains hotly debated. Fossil analyses suggest that several hominid species ambled around on two legs about 5 million to 7 million years ago. An upper leg bone of the oldest known, 7-million-year-old). But not all paleoanthropologists are convinced those features prove a two-legged gait. And some scientists think the bone belonged to an ape that may have walked upright at times.
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