Australopithecus afarensis
(source of picture: from World Wide Web)
Our most ancient ancestior is Australopithecus afarensis. They lived roughly
4 - 2.75 million years ago. " Lucy" (above picture) is the skeleton
remains of an Australopithecus afarensis which has made us aware of this
species. Males and females show a considerable difference in size, varying
from 1 - 1.7 m in height and from 25 - 50 kg in weight. This bipedal ancestor
had a brain capacity that fluctuated from 380 - 450 cc. (Wicander and Monroe
1993)
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