The Ngogo chimpanzee war involves two groups of chimpanzees in the Ngogo hill region of Kibale National Park, Uganda which have been engaged in a violent conflict since 2015. The conflict has been characterized by one-sided violence, including killing, brutal attacks, and mutilations, by the Western faction against the Central faction.
Because the Ngogo chimpanzees formerly constituted a single peaceful community that violently split apart, this conflict has been described as a ‘civil war.’ ‘The New York Times’ said the conflict was the bloodiest among chimpanzees ever recorded. This is the second major conflict between chimpanzees that has been observed by primatologists, the first being the Gombe chimpanzee war of the 1970s in Tanzania.
The chimpanzee community initially consisted of about 200 members living in relative cohesion for 20 years in the densely forested Ngogo region of Kibale National Park. Though various cliques existed, they generally cooperated and defended their territory together from other chimpanzee communities. Social cohesion began to break down, however, after several individuals of the Ngogo community, who had helped to ‘bridge’ the gaps between the cliques, died from disease in 2014. Furthermore, a new alpha male rose in the community, furthering tension.
The conflict began in 2015; tension among the Ngogo chimpanzees caused low-level violence, with two rival factions emerging. These were described as the Western and Central Ngogo chimpanzees by researchers. By 2018, the division had become complete, and the violence escalated in intensity. The Western faction, despite being numerically inferior, launched coordinated lethal raids into the Central Ngogo chimpanzees’ territory, seeking out and killing rival adult males. The raiders often ambushed isolated chimpanzees, overwhelming their targets with numbers. From 2021, the Western raiders also began to target and kill infants.
The Western faction’s attacks were so successful that the conflict has been described as a ‘one-sided rout,’ with the Westerners growing in numbers from 76 to 108, while the population of the Central faction suffered a ‘stepwise decline.’ By 2026, at least 28 chimpanzees, including 19 infants, had been killed by the western Nogogo chimpanzees during the conflict. All casualties had been among the members of the Central faction.
The war is the first rigorously documented ‘permanent fission’ and subsequent ‘civil war’ in wild chimpanzees without human intervention.
The Daily Omnivore 
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