Lucy is 3.2-million-year-old fossil that was also found in Ethiopia. It was recently in news, as the scientists said that Lucy had shared eastern Africa with another prehuman species, one that may have spent more time in trees than on the ground. The Lucy species had long before evolved almost human-like upright walking, bipedality, as attested by the Laetoli footprints in Tanzania from as early as 3.7 million years ago. This other species was still built for climbing trees and grasping limbs. It was capable of walking, though less efficiently and probably at an awkward gait.

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