429 pp. Fifth impression, 1976. B & W illustrations and plates. This superbly documented report describes, tabulates, analyzes, and evaluates every aspect of a gorilla's life: its habits of eating, nesting, mating, playing; its methods of communication; and its expressions of emotions. Sections on population dynamics, including mortality factors, on group dynamics, and on the gorilla's response to weather, to other animals, and to man.