This book examines the physiology, feeding and reproductive habits, and social behavior of each group of primates, including chimpanzees, organutans, gorillas, gibbons, Old World and New World monkeys, marmosets, and humans.

What is a primate? -- The primate family tree -- A primate's body -- Get my message? -- Chimpanzees -- Bonobos -- Orangutans -- Gorillas -- Gibbons -- Old World monkeys -- New World monkeys -- Prosimians -- Marmosets and tamarins -- How are people different? -- Primates in danger -- Words to know and index.