Orangutan

Sure, they seem like inelegent, pudgy, slow and gentle creatures, even feeble or sluggish. Given how gentle they appear most of the time, when they do decide to fly off the handle, which is rare, they are spine-chilling to watch. They can, when push comes to shove, move disconcertingly fast, and flaunt surprisingly quick reflexes. Their faces look different, their fur poofs up, and it's common to see two males really rip and tear into each other. A male orangutan would effortlessly kill a male chimpanzee. The souns an angry orangutan make are like nightmarish howls and shrieks.