re: "The Naked Ape"
I have a friend who used to work at Busch Gardens in Tampa, one of her coworkers, the animal curator, drove her to the Baboon Habitat, an island surrounded by a wide moat, and walked out to the edge of the water. The man elevated his arms in the baboon threat gesture, and the alpha male on guard across the water rushed to the shore, displaying those awful teeth and screaming a horrid howl of violence and aggression that completely took my friend, safely seated in the Land Rover, by surprise. She said it was terrifying.
Later, after she related the story to me, she remarked that at that moment she finally realized how close we still were, to that.