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Upright Walking May Have Begun in the Trees 1 (of 3)

Caption: An adult female Sumatran Orangutan resting in Gunung Leuser National Park, Indonesia. This image relates to an article that appeared in the June 1, 2007, issue of the journal Science, published by AAAS. The study, by Dr. S.K.S. Thorpe and colleagues at University of Birmingham in Birmingham, UK, was titled "Origin of Human Bipedalism As an Adaptation for Locomotion on Flexible Branches."

Credit: Image courtesy of SKS Thorpe, University of Birmingham, via Science-AAAS.

Usage Restrictions: Please cite the owner of the image when publishing. This image may be freely used by reporters as part of news coverage, with proper attribution. Non-reporters must contact Science for permission.