Edwin van Leeuwen, Sarah, E. De Troy, Stephan, P. Kaufhold, Clara Dubois, Sebastian Schütte, Josep Call, Daniel, B.M. Haun
Chimpanzees act cooperatively in the wild, but whether they afford benefits to others, and whether their tendency to act prosocially varies across communities is unclear. Here, we show that chimpanzees from neighboring communities provide valuable resources to group members at personal cost, and that the magnitude of their prosocial behavior is group specific. Provided with a resource-donation experiment allowing for free (partner) choice, we observed an increase in prosocial acts across the study period in the majority of chimpanzees. When group members could profit (test condition), ...