However, that idea was actually wrong. Excavations conducted in Asia and Africa have revealed that the brain of humans began to enlarge only two million years ago, and that could not have been a feature shared by our earliest human ancestors. Instead, the feature that distinguished humans from the other ape ancestors was the bipedal walking: locomotion using only the two hind legs.
■References (Books, papers, Web articles, etc.)
The Origin of Modern Humans (Scientific American Library) Roger Lewin W H Freeman & Co (October 1, 1993)
『ヒトはどのようにしてつくられたか』 山極寿一編 （岩波書店、2007）
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■The References list of “Evolution of Human Sociality”
