Primitive Mammals eBook

Mammals, fascinating and diverse vertebrates whose origins are unclear and which are often confused with the times when dinosaurs and other reptiles lived. This book reviews the geologic calendar to determine when mammals appeared, explains the reptiles from which they originated, and describes the first members of this amazing group of animals. The text explores how climate and geographical changes have influenced the emergence and extinction of different mammal types, tracing back to the beginnings of human beings.