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http://www.sciencenews.org/view/access/id/49281
Hints from chimp culture
After a juvenile Bossou chimp grooms a dominant male, the adult gives the juvenile access to cracking tools and a stash of Coula nuts. Learned behaviors, such as this exchange, often spread through chimp communities that live close together.
Credit: S. Carvalho/Univ. of Cambridge and Primate Research Institute at Kyoto Univ.


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