"A giant meteor blasts an enormous crater into Earth's surface, causing the end of what scientists call the Age of Dinosaurs. Gail Gibbons presents the most recent and up-to-date theories about the history of dinosaurs and dinosaur discoveries. She discusses the Triassic, Jurassic, and Cretaceous periods and the dinosaurs that lived during each time. This newly revised edition reflects the newest paleontological discoveries... includes revised dinosaur classifications, new information on the clubbed tails of the ankylosaurus, and new evidence of how dinosaurs used their excellent senses of sight, smell, and hearing."--