Includes index.

Biological principles: Zoology, an evolutionary and ecological perspective; Cells, tissues, organs, and organ systems of animals; Cell division and inheritance; Evolution, history and evidence; Evolution and gene frequencies --
Animal-like protists and animals: Animal classification, phylogency, and organization; Animal-like protists, the protozoa; Multicellular and tissue levels of organization; Triploblastic, acoelomate body plan; Pseudocoelomate body plan aschelminths; Molluscan success; Anneclida, the metameric body form; Arthropods, blueprint for success; Hexapods and myriapods, terrestrial triumphs; Echinodems; Hemichordata and invertebrate chordates; Fishes, vetrebrate success in water; Amphibians, the first terrestrial vertebrates; Reptiles, the first amniotes; Bird, feathers, flight, and endothermy; Mammals, specialized teeth, hair, endothemy, and viviparity --
Form and function, a comparative perspective: Protection, support, and movement; Communication I, nervous and sensory system; Communication II, the endocrine system and chemical messages; Circulation and gas exchange; Nutrition and digestion; Temperature and body fluid regulation; Reproduction and development; Chemical basis of animal life; Energy and enzymes, life's driving and controlling forces; How animals harvest energy stored in nutrients; Embryology; Animal behavior --
Glossary.