Synopsis The book presents a comprehensive synthesis of mammalian morphology, anatomy, physiology, embryology and origin and evolution. This book provides nucleus around which the teachers can plan a successful course without too much learning on complementary and supplementary readings. Efforts have been made to avoid overburdening the students with information. Many of the omissions are intentional to make the text selective.The second revised edition of the book contains the reading material in the knight of latest researchers and development in the field. These include origin and evolution of mammals, Aquatic adaptation in Mammals, Dentition, Placentation Development and Classification and affinities etc.