Mammals are animals of the Mammalia, a large class of warm blooded vertebrates having mammary glands in the female, a thoracic diaphragm, and a four chambered heart. The class includes the whales, carnivores, rodents, bats, primates etc. Amidst the plenty of literature on the topic in one shape and other, this work is unique which encompasses complete encyclopaedic information on Mammals. This text is designed to approach the morphology, anatomy, physiology and development of the Mammals in a coherent way. Profusely illustrated, the book features both a text and a laboratory guide. It deals with the structures and physiological phenomena of each system. Origin, adaptative radiation and other general topics are also dealt in details. It is hoped that this work will not only meet the requirement of Indian students but will also be useful as a dependable reference work to the teachers in their teaching.