Our world is in a constant state of gradual change. And Earth today is very different from the place where dinosaurs once roamed. This intriguing volume covers not just the jaw-dropping dinosaurs of the Triassic, Jurassic, and Cretaceous periods, but also the strange insects, fish, mammals, and other animal life that emerged before and after. Imaginative illustrations, captivating text, and fun fact boxes introduce readers to some of the most bizarre beasts of the prehistoric era, while a timeline aids them in tracing life-forms from their most primitive to today.