well, pretty much anybody. And now chimps. Apparently the urge to
engage in expansionist warfare and seize one's neighbor's land is
another thing that is no longer exclusive to the human race. So
if territorial expansion is hard-wired into our DNA, does that give
us an alibi to invade our neighbors and shrug it off as "evolution, baby".
Chimp-on-chimp attacks in the wild are very common, especially among small packs of males on patrol. Now research suggests the motive for these crimes is to gain territory.