Chimpanzees at war for eight years in Uganda's Kibale National Park have, since 2018, systematically killed at least 28 members of their own former community in coordinated raids, in what a 2026 peer-reviewed paper in Science has described as only the second documented chimpanzee civil war in history, in a community that until 2015 had been the largest cohesive group of wild chimpanzees ever recorded

Chimpanzees at war for eight years in Uganda's Kibale National Park have, since 2018, systematically killed at least 28 members of their own former community in coordinated raids, in what a 2026 peer-reviewed paper in Science has described as only the second documented chimpanzee civil war in history, in a community that until 2015 had been the largest cohesive group of wild chimpanzees ever recorded

The Ngogo chimpanzees of Kibale National Park in western Uganda have been continuously studied by primatologists for thirty years. The Ngogo Chimpanzee Project was co-founded in 1995 by John Mitani of the University of Michigan and David Watts of Yale University, and is now co-directed by Aaron Sandel of the University of Texas at Austin. The project has documented approximately 200 individual chimpanzees through their full life cycles, recorded…