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The original was posted on /r/todayilearned by /u/TheCriticalGerman on 2024-05-04 03:46:27.

Original Title: TIL there is some chimpanzee populations that inhabit the savanna and act differently then the forest populations for example using caves, filtering drinking water, walking more on two legs than forest chimpz do and more. There is an Arte documentary on YouTube with them filtering water.