Chimps in Senegal found to fashion spears for hunting (2015)(phys.org)
phys.org
Chimps in Senegal found to fashion spears for hunting (2015)
https://phys.org/news/2015-04-chimps-senegal-fashion-spears.html
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https://phys.org/news/2015-04-chimps-senegal-fashion-spears.html
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