Conflict in the Forest: The Ngogo Chimpanzee Civil War

Researchers at Uganda’s Kibale National Park have documented a devastating civil war within the world’s largest wild chimpanzee community.

For twenty years, nearly 200 apes lived cohesively, but a violent rupture in 2015 led to a permanent split by 2018. The community fractured into Western and Central factions, sparking an unprecedented campaign of coordinated slaughter.

The Western group has been the primary aggressor, killing at least 17 infants and seven adult males. According to lead author, Aaron Sandel, the shift was profound: “These were chimps that would hold hands. Now they’re trying to kill each other.”

Scientists attribute the collapse to a “perfect storm” of stressors, including the deaths of social bridge individuals, a change in alpha leadership, and a 2017 respiratory epidemic. This rare event, estimated to occur only once every 500 years, suggests that lethal group hostility has deep biological roots.

Primatologist Richard Wrangham noted that “You do not need ideology to generate hostilities,” indicating that human warfare may be driven more by evolutionary biology than by political or religious beliefs.

As human activity further disrupts these fragile social networks, such catastrophic internal conflicts may become increasingly common.

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