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Chimpanzees are indifferent to the welfare of unrelated group members

Joan B. Silk, Sarah F. Brosnan, Jennifer Vonk, Joseph Henrich, Daniel J. Povinelli, Amanda S. Richardson, Susan P. Lambeth, Jenny Mascaro and Steven J. Schapiro

Nature 437, 1357-1359 (27 October 2005)

doi:10.1038/nature04243