Chimpanzees are indifferent to the welfare of unrelated group members

  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},
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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  • D. Watts
  • Biology
    Behavioral Ecology and Sociobiology
  • 1998
Data from an unusually large chimpanzee commmunity at Ngogo, Kibale National Park, Uganda, that contains more males than any previously studied community show new variation in chimpanzee mate-guarding behavior, and pairs or trios of top-ranking males sometimes engaged in cooperative aggression to prevent estrous females from mating with other males, but tolerated each other's mating activities.
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