Mammals form the highest group in the animal kingdom and are called 'Vertebrates on top'. This book is an effort to bring under one roof, whatever one needs to know about mammals. The reptilian origin, their classification which covers all the existing prototheria, metatheria and eutheria, and all orders are discussed with examples and relevant diagrams. It brings to the reader, various facts about mammals in a sequential and systematic way. The book also discusses the economic importance as wel