Orangutans & the (possible) Origins of Human Bipedalism » Spread Eagle Orangutan
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Ancient apes that traveled the treetops on two legs—such as modern-day orangutans do—may have led to upright walking in humans, experts claim.
Yet a prevailing theory still maintains bipedalism evolved after our ancestors left the trees and began living in the African grasslands.
Photograph courtesy SKS Thorpe
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