Lions, for example, are highly territorial beasts; most people seem well aware of this. But as it turns out, geese will defend their turf as well—and quite aggressively at times.
Chimps seem so friendly and lovable but as one woman found out more than 2 years ago that isn't always the case. They are indeed a wild animal and when they go rogue it can be deadly at the worst, disfiguring at the least. Charla Nash's face and hands were ripped off during an attack by Travis the chimp, a friends pet, and changed her life forever.