Pacifism is not usually a winning survival strategy in the harsh wilderness of natural selection. But bonobos have made excess friendliness into a success story. Bonobos are incredibly social chimpanzees, who use grooming, games, and tons of hanky panky as a way to resolve conflicts, reinforce bonds, reduce stress, and celebrate. Biologists who study bonobos are baffled by their relative peacefulness compared to other great ape species (including humans). They have little interest in fighting each other, and are not threatened by other bonobo tribes — on the contrary, they enjoy partying with their neighbors! In a world where most species have to armor up to stay alive, it's comforting to see an animal get ahead with the opposite tack.