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Science 1 June 2007:
Vol. 316. no. 5829, pp. 1292 - 1294
DOI: 10.1126/science.1143571
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Perspectives

ANTHROPOLOGY:
Walking on Trees

Paul O'Higgins and Sarah Elton

Observations of modern orangutans suggest that human bipedalism may have evolved in the trees rather than on the ground.

P. O'Higgins is at the Functional Morphology and Evolution Unit, Hull York Medical School, University of York, Heslington, York YO10 5DD, UK. E-mail: paul.ohiggins{at}hyms.ac.uk S. Elton is at the Functional Morphology and Evolution Unit, Hull York Medical School, University of Hull, Cottingham Road, Hull HU6 7RX, UK. E-mail: sarah.elton{at}hyms.ac.uk

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Science. ISSN 0036-8075 (print), 1095-9203 (online)