Learn all about monkeys, the many species of this primate, their social behaviour, and their prehensile tails. Detailed graphics, diagrams and video images help us learn about New World monkeys, Old World monkeys, the six genuses of monkeys, monkey characteristics, trichromatic vision, their use of tools, diet, intelligence, life in a troop, the social hierarchy, vocalization, grooming, varieties of monkeys and their environments, monkeys on the endangered species list, and monkeys and people sharing the environment.