Researchers have observed a group of chimpanzees in Uganda's Kibale National Park engaged in an eight-year 'civil war', resulting in 24 killings, including 17 infants. The conflict began after the group split into two factions, with the Western group attacking the Central group. The reasons for the split are unclear, but factors such as competition for resources, male-male competition, and changes in the dominance hierarchy may have contributed. The study's findings may inform our understanding of human conflict and warfare.