Deep in the rainforests of Uganda, scientists have watched the largest known group of wild chimpanzees ( Pan troglodytes ) turn on each other, as if engaging in a 'civil war'. The lethal conflict is the first clear example of a ferocious fission in a wild chimpanzee community – which fractured into two warring groups. Over many years, scientists watched as wild primates that once lived, ate, groomed, and patrolled together gradually turned on each other, ultimately becoming lethal rivals. As