Overview
- The peer-reviewed Science study published Thursday, built on decades of data, documents the first clearly observed permanent split and sustained killings within a wild chimp community.
- The Ngogo group in Uganda polarized from 2015 to 2018 into Western and Central factions that now hold separate ranges in what researchers say is a once-in-centuries event.
- From 2018 to 2024, Western chimps carried out coordinated raids that killed at least seven adult males and 17 infants from the Central group, targeting former long-term companions.
- Western numbers rose from 76 to 108 as Central declined, and researchers warn the Central faction may be headed toward local extinction if the losses continue.
- Possible triggers include an oversized community, the deaths of key “bridge” males, and a 2015 shift in alpha leadership, though the cause remains unresolved and the violence continues under close monitoring.