Chimps are brutal, and it is so deliberate. The males go out and get near the boundary of their territory. And they walk very silently trying hard not to make any noise. They will climb into a tree and stare out over hostile territory for hours. They are waiting for the right opportunity. And then they attack.
Jane GoodallWe find animals doing things that we, in our arrogance, used to think was "just human".
Jane GoodallChimps are very quick to have a sudden fight or aggressive episode, but they're equally as good at reconciliation.
Jane Goodall