In this work, S. A. Barnett, one of the world's foremost authorities on animal behavior, describes the roles of instinct and intelligence in the animal kingdom. It discusses the senses of animals, their rites and realms, ways of communication, social communities, responses to tension and stress, migratory habits, mating, reproduction, and the sources of human behavior. The text examines man's behavior regarding property and that of animals in the areas in which they live. Can the two be compared? The author demonstrates a keen understanding of the subtle interplay of "instinct" and "intelligence" while offering a comprehensive treatment of how and to what ends the variety of life on this planet acts and reacts. From this exploration, the startlingly significant role of "intelligence" in the whole of the animal kingdom emerges. The text presents an all-encompassing and up-to-the-minute survey of what we know about the behavior of our fellow creatures and its importance for humankind.