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Science 3 March 2006:
Vol. 311. no. 5765, pp. 1248 - 1249
DOI: 10.1126/science.1125141
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Perspectives

BEHAVIOR:
Who Are More Helpful, Humans or Chimpanzees?

Joan B. Silk

Humans, including infants, are more willing than closely-related chimpanzees to cooperate and behave altruistically and cooperatively, probably in part accounting for their evolutionary success.

The author is in the Department of Anthropology, University of California, Los Angeles, CA 90095, USA. E-mail: jsilk{at}anthro.ucla.edu

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