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Chimpanzee factions in Uganda kill dozens in brutal fighting

Apr 9, 2026, 8:00 PM10
(Update: Apr 9, 2026, 8:00 PM)
country in East-central Africa

Chimpanzee factions in Uganda kill dozens in brutal fighting

  • Chimpanzee community in Uganda split into violent factions, leading to intense conflict.
  • Since 2015, documented violence resulted in the deaths of at least 28 chimpanzees, primarily due to aggressive behavior from the Western group.
  • These findings provide insights into aggression and group identity, raising parallels to human society.
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In Uganda, an intense and violent conflict has erupted among chimpanzees, particularly in the Ngogo region, starting in 2015. Researchers John Mitani from the University of Michigan and Aaron Sandel from the University of Texas have documented these events closely. The violence resulted in a division within the chimpanzee community, which had previously operated cohesively. The two groups, identified as the Western and Central Ngogo chimpanzees, have become embroiled in bloodshed that could be likened to a human civil war. Social bonds have disintegrated over time due to various factors, such as the deaths of key adult males and the resulting territorial divisions. By 2018, both chimpanzee factions had markedly turned against each other, not sharing the same territory and displaying increased aggression towards each other. Since 2018, all attacks have been initiated by the Western group, which was initially the minority before aggression escalated. This ongoing violence has resulted in the loss of numerous lives, with at least 28 chimpanzees killed, including 19 infants, distinguished amongst brutal attacks where innocent young ones were often ripped from their mothers during conflicts. The study highlights the broader implications for understanding violence both in chimpanzees and as a comparative lens toward human behaviors and warfare dynamics. Mitani and Sandel suggest that these findings could reveal important lessons about group identities and aggression among humans, underscoring that while chimpanzees exhibit violent tendencies, humans have evolved to be more cooperative and pro-social.

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