The biological branch which deals with the study of evolutionary, structural and behavioral characteristics of animals is referred to as zoology. It also focuses on the classification, habits and distribution of living and extinct animals as well as their interaction with their ecosystems. There are various sub-disciplines of zoology such as zoography, comparative anatomy, behavioral ecology, ethology, vertebrate zoology, soil zoology, invertebrate zoology and animal physiology. Zoography is an applied science which deals with animals and their habitats. Comparative anatomy is involved in the study of the structure of animals. Behavioral ecology is concerned with the evolutionary basis for animal behavior due to ecological pressures. Zoology also branches out into various taxonomically oriented disciplines such as mammalogy, herpetology, ornithology, entomology and biological anthropology. This textbook attempts to understand the multiple branches that fall under the discipline of zoology and how such concepts have practical applications. It provides comprehensive insights into this field. This book is a complete source of knowledge on the present status of this important field.