Study Documents Lethal Split in Uganda's Ngogo Chimp Community
A Science study shows the long-studied Ngogo community split by 2018 and has seen repeated lethal attacks, suggesting relational dynamics may drive violent group breakdowns.
New York PostHundreds of chimpanzees are killing each other in a ‘civil war’ — scientists captured the ‘lethal violence’ for the first time
BBC NewsChimpanzees in Uganda locked in vicious 'civil war', say researchers
IFL ScienceIn 2018, The World’s Largest Wild Chimpanzee Group Split In Two – And There’s Been Violence Between Them Ever Since
The Daily WireBloody Civil War Between Two Factions Of Chimpanzees Has Scientists Baffled
Overview
A study published April 9 in Science reports a long-studied Ngogo chimpanzee community split into two groups and has experienced sustained lethal violence.
Researchers say polarization began in June 2015 and the community fully separated by 2018 after changes in dominance and the deaths of key individuals.
Lead author Aaron Sandel and colleagues argue the pattern may illuminate relational drivers of human conflict, while other primatologists said the case is rare and unsettling.
Researchers documented 24 targeted attacks from 2018 that killed at least seven adult males and roughly 17 to 19 infants, and other accounts put total deaths in a roughly 24-to-more-than-28 range.
The authors said the conflict continued through 2024 and that the true toll may be higher, leaving the long-term outcome unresolved.
Analysis
Center-leaning sources frame the story by emphasizing human parallels and conflict, using charged terms like 'collective violence' and 'polarization' while highlighting dramatic details ("killing former group members") and long-term data. Editorial choices—headline focus and selective emphasis on human insight despite a quoted caution against 'civil war'—steer readers toward analogy.