Chimpanzees are indifferent to the welfare of unrelated group members
Publication information:
Silk, Joan B., Sarah F. Brosnan, Jennifer Vonk, Joseph Henrich, Daniel J. Povinelli, Amanda S. Richardson, Susan P. Lambeth, Jenny Mascaro, and Steven J. Shapiro. “Chimpanzees Are Indifferent to the Welfare of Unrelated Group Members”. Nature 437, no. 7063 (2005): 1357-59.