Chimp drinking culture caught on video
10 January 2017 Last updated at 00:13 GMT
Researchers have used camera traps to film chimpanzees in the Ivory Coast making unique tools.
The footage revealed that the clever primates habitually make special water-dipping sticks - chewing the end of the stick to turn it into a soft, water-absorbing brush.
Primate researchers examined the "dipping sticks" and concluded they were made specifically for drinking.
Footage courtesy of Juan Lapuente, Comoe Chimpanzee Conservation Project