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• n  the bodily attribute of being bipedal; having two feet
  bipedalism made the human form of birth possible

• On first blush, bipedalism just doesn't make much sense.
• She showed us conclusively that upright walking and bipedalism preceded all of the other changes we'd normally consider being human, such as tool-making.
• If paleontologists argue about why bipedalism evolved, they're even more contentious over the organization of the human family tree.

News & Articles

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• Early tree-dwelling bipedal human ancestor was similar to ancient apes and 'Lucy' but not living apes
  An analysis of the femur of one of the oldest human ancestors reveals the six-million-year-old “Millenium Man” was bipedal but lived in the trees. The research could provide additional insight to the origins of human bipedalism.
  Dec. 5, 2013 - Science Daily

Quotes

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• Chris Stringer in New Scientist (subscription)
  Since all the sites which have yielded fossil evidence of our earliest ancestors were forested or wooded, rather than open, Stringer says, "arboreal bipedalism is certainly a very plausible mechanism for the origins of walking upright."