The branch of biology that deals with the study of animal kingdom, including their structure, classification, habits, embryology, evolution, and distribution is termed as zoology. It also focuses on their interactions with their ecosystems. There are various branches of zoology such as zoography, comparative anatomy, animal physiology and behavioral ecology. Zoography is the branch of zoology which describes the animals and their habitats. Comparative anatomy deals with the structure of animals. The scientific study of functions and mechanisms in animals is known as animal physiology. Behavioral ecology focuses on evolution of behavior of animals due to ecological pressure. This book provides significant information of this discipline to help develop a good understanding of zoology and related fields. It will also provide interesting topics for research which interested readers can take up. The extensive content of this book provides the readers with a thorough understanding of the subject.