Bipedalism and apes
British researchers found that orangutans walked on all fours when moving on thick branches, but walked upright using their hands to maintain balance on thin branches. The scientists think that this finding further blurs the distinctions between early humans and apes because bipedalism has long been a key criterion for distinguishing human ancestors.
Standing on two legs gives the apes a distinct advantage by enabling them to gather fruit from thinner branches. Isn't this how Adam got in trouble?
Upright Walking May Have Begun in the Trees [AAAS News Release]
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