Anatomy and Physiology are complementary fields of study especially for disciplines associated with biology. This book exclusively covers the topics related to anatomy and physiology of animals. It aims to shed light on the multidisciplinary facets of zoology by focusing on the structural, physiological and evolutionary advancements in animals which have been extensively covered in this book. Students, researchers, experts and all associated with zoology, veterinary sciences and related fields will benefit alike from this book.