Darwin - PeterHudsonphotos
The chimps of Mahale are a  habituated group that have been studied since 1964.

The chimps of Mahale are a habituated group that have been studied since 1964.

Darwin sitting while a Tanzanian researcher working on the long term study (blue overalls) and a guide watch him

Mahale20142565AfricaChimpanzeeDarwinLake TanganyikaMahale National ParkMaleTanzania