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A chimp civil war has raged for 8 years in Uganda. What it says about human violence

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Researchers have documented what they describe as a rare permanent split in the largest known group of wild chimpanzees, the Ngogo community in Uganda's Kibale National Park. The study, published in the journal Science, drew on 30 years of demographic data and behavioral observations.

Researchers have documented what they describe as a rare permanent split in the largest known group of wild chimpanzees, the Ngogo community in Uganda's Kibale National Park. The study, published in the journal Science, drew on 30 years of demographic data and behavioral observations.

The Ngogo chimpanzee community, which numbered nearly 200 individuals, began fracturing in 2015 before fully dividing into two distinct groups — the Western and Central clusters — by 2018. Social, spatial and reproductive ties between the two groups ceased entirely after the split.

The Ngogo chimpanzee community, which numbered nearly 200 individuals, began fracturing in 2015 before fully dividing into two distinct groups — the Western and Central clusters — by 2018. Social, spatial and reproductive ties between the two groups ceased entirely after the split.

Researchers identified several factors that may have contributed to the split, including the 2014 deaths of five adult males and one adult female, a change in alpha male in 2015 and a respiratory disease outbreak in 2017 that killed 25 chimpanzees.

Researchers identified several factors that may have contributed to the split, including the 2014 deaths of five adult males and one adult female, a change in alpha male in 2015 and a respiratory disease outbreak in 2017 that killed 25 chimpanzees.

Following the permanent fission, members of the Western group carried out 24 coordinated attacks on the Central group between 2018 and 2024, killing at least seven adult males and 17 infants. Researchers noted the true death toll is likely higher, as many individuals disappeared without confirmed cause.

Following the permanent fission, members of the Western group carried out 24 coordinated attacks on the Central group between 2018 and 2024, killing at least seven adult males and 17 infants. Researchers noted the true death toll is likely higher, as many individuals disappeared without confirmed cause.

The only previously recorded comparable event occurred in the 1970s, when Jane Goodall observed a violent split among chimpanzees in Tanzania's Gombe National Park. That case has remained contested because the chimps were regularly provisioned with food by researchers, which may have altered their behavior.

The only previously recorded comparable event occurred in the 1970s, when Jane Goodall observed a violent split among chimpanzees in Tanzania's Gombe National Park. That case has remained contested because the chimps were regularly provisioned with food by researchers, which may have altered their behavior.

Genetic evidence suggests permanent fissions in chimpanzee communities occur roughly once every 500 years. Researchers said human activities such as deforestation, climate change and disease outbreaks could make such conflicts more frequent.

Genetic evidence suggests permanent fissions in chimpanzee communities occur roughly once every 500 years. Researchers said human activities such as deforestation, climate change and disease outbreaks could make such conflicts more frequent.

Rare Chimp Community Split Turns Deadly in Uganda

Rare Chimp Community Split Turns Deadly in Uganda

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Rare Chimp Community Split Turns Deadly in Uganda

Rare Chimp Community Split Turns Deadly in Uganda

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