This book introduces the social behavior of Tibetan monkeys Tibetan macaques at Mt. Huangshan in China. Like other macaques, they live in multiple female and male groups with female philopatry and male dispersal. Unlike most other macaques, however, male Tibetan monkeys carry an infant to another male, hold up the infant, and suck the infant s penis together. Males show their penises to other males and suck the penises of other males. In antagonistic interactions, females form a coalition with unrelated females as well as with their mother and daughters. At night, they huddle and sleep on the ledge of a steep cliff.