These Chimps Began the Bloodiest ‘War’ on Record. No One Knows Why.
The New York Times
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A long-running conflict in a Ugandan park may provide clues to the origins of human warfare, and how to avoid it.
Chimpanzee 'Civil War' Stuns Scientists
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Scientists stunned as chimpanzees turn on friends in killing spree
Sydney Morning Herald —
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Deep in a Ugandan forest, chimpanzees wage a lethal 'civil war'
ABC News —
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Chimpanzee group's violent rupture hints at evolutionary roots of war
New Scientist —
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World’s Largest Group of Chimps Waging Deadly ‘Civil War,’ Scientists Discover
404 Media —
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Chimpanzees Are Murdering Their Former Friends, and Researchers Can’t Wrap Their Heads Around It
Gizmodo —