>>13706971Lethal aggression in Pan (2014)
https://www.nature.com/articles/nature13727recorded every chimp killing at every study site in Africa and found that 60% of all chimp-on-chimp deaths were the result of between-group violence committed by males. One of the study’s authors, Michael Wilson, said that the evidence they gathered “suggests that chimpanzees just do this naturally.”
Chimps are by no means the only animals to wage large-scale or prolonged warfare. Within-species turf wars are common among many group-living animals, including meerkats, lions, and wolves. An interesting study by the University of Minnesota’s Voyageurs Wolf Project used GPS collars to track the movements of six wolf packs around Voyageurs National Park.
https://archive.vn/U7QcMThe animation linked demonstrates that wolves are intensely territorial and generally avoid encroaching on other packs (unless food resources become scarce, in which case they go to war). It also disproves the ridiculous myth that borders are nothing more than “arbitrary and meaningless lines on a map.”