Chimpanzees are indifferent to the welfare of unrelated group members

@article{Silk2005ChimpanzeesAI,
  title={Chimpanzees are indifferent to the welfare of unrelated group members},
  author={Joan B. Silk and Sarah F. Brosnan and Jennifer Vonk and Joseph Henrich and Daniel J. Povinelli and Amanda S. Richardson and Susan P. Lambeth and Jenny Mascaro and Steven J. Schapiro},
  journal={Nature},
  year={2005},
  volume={437},
  pages={1357-1359}
}
Humans are an unusually prosocial species—we vote, give blood, recycle, give tithes and punish violators of social norms. Experimental evidence indicates that people willingly incur costs to help strangers in anonymous one-shot interactions, and that altruistic behaviour is motivated, at least in part, by empathy and concern for the welfare of others (hereafter referred to as other-regarding preferences). In contrast, cooperative behaviour in non-human primates is mainly limited to kin and… 
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