This new volume fully explores zoology, the branch of biology that studies the animal kingdom, including the structure, embryology, evolution, classification, habit, and distribution of all animals, and how they interact with their ecosystems. Easy-to-understand essays cover the following areas of zoology investigation: Zoography; Invertebrate Zoology; Animal Physiology; Vertebrate Zoology; Behavioral Ecology; Soil Zoology; Ethology; and Taxonomic Disciplines. The volume provides high school and college students with a history of zoology from ancient to modern times, including the transformation work of Thomas Henry Huxley, who brought the teaching of zoology out of the lecture hall and into the laboratory.