This book describes the major events in the history of dinosaurs and surrounding events in the Age of Reptiles. It is written about the world that dinosaurs lived in: environments, climate, bird evolution, origin of mammals, migrating continents, mass extinctions, asteroids and massive volcanic flows. For example, all three major episodes of volcanism are tied directly to major changes in dinosaur origin and evolution. Climates varied from intense heat in a single supercontinent at the beginning to equable climates and densely clothed forests as continents drifted apart. The book is well-illustrated. It includes 65 images taken from fossil specimens located mostly in the major museums of natural history