Do chimpanzees reciprocate received favours?

  • Alicia P. Melis, Brian Hare, Michael Tomasello
  • Animal Behaviour, September 2008, Elsevier
  • DOI: 10.1016/j.anbehav.2008.05.014

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http://dx.doi.org/10.1016/j.anbehav.2008.05.014