A petite female early human climbed along tree branches on all fours but spent time upright on the ground some 4.4 million years ago in her woodland home in what is now Ethiopia. This ancestral image comes from a partial skeleton of a hominid nicknamed "Ardi," who weighed in at 110 pounds (50 kg) with a height of just under 4 feet (120 cm).
...The species brings scientists closer than ever to the last common ancestor we shared with chimpanzees and gorillas, which lived about 6 million or more years ago just before early humans split off from the chimpanzees and bonobos. (Anatomically modern humans, Homo sapiens, didn't appear on the scene until about 200,000 years ago.)
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