The board is too long to enable one individual member to operate the lever and reach the food at the same time. However, the individual can do the other members of the group a service by bringing the food into reach.


The study „The evolutionary origin of human hyper-cooperation“ by Dr. Judith Burkart and colleagues, Anthropological Institut & Museum, University of Zurich is supported by the Swiss National Science Foundation (SNSF): [ Ссылка ].

Copyright: Anthropological Institute & Museum, University of Zurich, Switzerland

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