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Why do humans walk on two legs?

        Animals | Primates

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  • "Chimps on treadmills offer evolution insights." Reuters. July 17, 2007.
  • "Introduction to Archaeology: Glossary." Archaeological Institute of America.
  • Connor, Steve. "The truth about why we walk on two legs: it saves energy." The Independent. July 17, 2007.
  • Knight, Meredith. "Walking Tall: Why Did Humans Switch From Four- to Two-Legged Strides?" Scientific American. July 17, 2007.
  • Mayell, Hillary. "Fossil Pushes Upright Walking Back 2 Million Years, Study Says." National Geographic News. Sept. 2, 2004.
  • Schmid, Randolph E. "Why We Walk on Two Legs: It's Easier." Associated Press. Discovery News. July 17, 2007.
  • Sockol, Michael D., Raichlen, David A. and Pontzer, Herman. "Chimpanzee locomotor energetics and the origin of human bipedalism." Proceedings of the National Academy of Sciences. July 16, 2007.
  • Waldman, Dan. "Monkey apes humans by walking on two legs." Associated Press. July 21, 2004.