BBC NEWS | Science/Nature | Upright walking 'began in trees': "The ancestors of humans began walking upright while they were still living in trees - not out on open land, according to a new theory.
The traditional view is of bipedalism evolving gradually from the four-legged 'knuckle-walking' displayed by chimpanzees and gorillas today.
Now, a study published in the journal Science disputes this idea.
The British authors of the study say that upright walking was always a feature of great ape behaviour..."
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