Researchers studying chimpanzees in Uganda’s Kibale National Park say the once-unified troop has split into rival factions, with no clear end in sight to the growing hostility.
The division became apparent in June 2015 when Aaron Sandel, who oversees the chimpanzee research project, noticed the animals behaving unusually. Instead of their typical greetings—loud calls, back slaps, and hand-holding—many chimpanzees avoided interaction, some even fleeing the area.
By 2019, the group had clearly divided into western and central factions. Observers reported seeing central chimpanzees surrounded by western rivals, baring their teeth in tense standoffs.
John Mitani, who has studied the chimpanzees for two decades, said he could not explain the sudden shift in behavior when asked by Sandel. The former companions now act as if they are strangers.
Sandel believes the event planted the seeds of polarization that led to the troop’s fragmentation. Once numbering over 200 at its peak, the community has since broken apart.
The ongoing split highlights how deeply social bonds can erode even among our closest relatives, offering a stark parallel to human societal divisions. Scientists continue to monitor the situation, though reconciliation remains uncertain.
