| Summary: | In the 1950s, rhesus macaques living on the island of Koshima in Japan started to wash the sweet potatoes researchers gave them to eat. This observation could have remained anecdotal if the Japanese primatologists had not given to this innovation the name of: 'preculture'. Culture, always considered as a distinctive feature of the human race was being put into question. The study of the most evolved primates, our cousins the chimpanzees and bonobos, has since then enabled us to give a more precise definition of animal culture: habits acquired through a learning process leading to tradition.
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