This easy-to-read series groups dinosaur and ancient reptile species by prominent characteristics and describes the "Xtremes" in physical structure and function each possesses. Fossil explains the work of paleontologists. The illustrations feature dramatic close-ups and action poses of ferocious-looking dinosaurs and the fossil remains of their impressive teeth, jaws, beaks, and plates. Layered images and superimposed type contribute to a cluttered design. Glos., ind.