Researchers at Kyoto University spent more than 600 hours studying 20 captive chimps to determine if urination is socially contagious among them.

Koko the chimpanzee was a happy-go-lucky fellow, but he couldn't shake one nagging thought: his lack of a tail.

Listeners are truly shocked—"Wait what?" they say, "Chimps eat other animals?" They do, I say. They eat piglets, and small deer, but mostly monkeys. The chimps of Ngogo, Uganda, spend a good ...