Behind the scenes at a Chicago zoo, chimpanzees who spent years entertaining humans are learning to befriend their own kind. Behind the scenes at a Chicago zoo, chimpanzees who spent years entertaining humans are learning to befriend their own kind. your-feed-science, your-feed-animals, Animal Abuse, Rights and Welfare, Monkeys and Apes, Zoos, Animal Behavior, Endangered and Extinct Species, Animals, Wildlife Trade and Poaching, Television, Chimp Crazy (TV Program) NYT > Science