Ngogo 'Chimp Wars' Losses
TourismBoardUg posted dramatic images and figures from a rare territorial conflict in Uganda's Ngogo community that reportedly killed 24 chimpanzees — 17 infants and 7 males — a loss the post described as mirroring human patterns of conflict (x.com). The social post combined vivid photography with the casualty breakdown to highlight the event (x.com).
A once-unified chimpanzee community in Uganda’s Kibale National Park split in two and then turned lethal, with researchers documenting at least 24 killings after the break. (science.org) The killings happened in the Ngogo community, the largest wild chimpanzee group ever recorded, after a permanent split that researchers say was already visible by 2018. The dead included at least seven adult males and 17 infants from the Central group, mostly in attacks by the smaller Western group. (news.utexas.edu) Researchers tracked the Ngogo chimpanzees from 1995 through 2024 and recorded 24 targeted attacks after the split. The paper, published in *Science* on April 9, 2026, describes the first clearly documented permanent fission of a wild chimpanzee community followed by sustained intergroup violence. (news.umich.edu) Chimpanzees already fight neighboring groups over territory, food and mates, but Ngogo was different because the attackers and victims had lived in the same community for years before the rupture. Researchers and outside experts described the case as the clearest observed example of a chimpanzee “civil war.” (science.org) The Ngogo group had about 200 chimpanzees before the split, far larger than most chimpanzee communities, and scientists say that size may have made internal divisions harder to manage. Social network data showed the community had separated into Western and Central clusters years before the break became permanent. (news.asu.edu) The smaller Western faction gained ground after the split, expanding into parts of the former shared range and growing in numbers, while the Central group lost males, infants and territory. Reuters reported that researchers were still observing hostilities as of 2024. (usnews.com) Scientists do not know exactly what triggered the rupture. Aaron Sandel of the University of Texas at Austin said the team found no evidence that disease, habitat destruction or direct human interference caused the split, and the paper points instead to changing social ties and competition within an unusually large group. (news.utexas.edu) The only comparable case came from Gombe National Park in Tanzania in the 1970s, when Jane Goodall documented a smaller community split followed by killings. The Ngogo conflict lasted longer, involved more animals and was observed with far richer behavioral data than the Gombe case. (smithsonianmag.com) Ngogo is also familiar to many viewers from Netflix’s 2023 series *Chimp Empire*, which filmed the same Kibale population before this study was published. The new paper turns that well-known group into one of the most closely watched cases of long-term violence ever recorded in wild chimpanzees. (phys.org)
