The researchers used camera traps to film chimpanzees in Ivory Coast are just tools.
The film shows that intelligent primates immersed usually do sticks in special water - chewing the end of the stick it into an absorbent brush fresh water to.
Researchers examined 'dipsticks' primates and concluded that they specifically made to have been drinking.
The results are presented in the American Journal of Primatology.
Videos courtesy of Juan Lapuente, Comoe chimpanzees - protection project
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