What did bipedalism bring to humans?

So, how did bipedalism help our human ancestors overcome the problems of savannah life? Scientists previously thought that freeing the hands through bipedal walking immediately facilitated tool use and food transportation. However, it is now thought that the high energy efficiency of bipedalism was a more important factor.

■References (Books, papers, Web articles, etc.)
Origins Reconsidered: In Search of What Makes Us Human  Richard E. Leakey  Anchor; Reprint edition (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”