Comment by murm

There's also the 1,5h documentary Rise of the Warrior Apes which is sort of a "prequel" to Chimp Empire. It was filmed over a period of 20 years in the same location and documents how the researches originally came upon this unusual chimpanzee tribe. The production values are not nearly as polished as in Chimp Empire but in my opinion it was still an interesting watch if you find this kind of stuff fascinating. The researchers themselves talk a lot in this.