Allosaurus was a large dinosaur that lived during the Late Jurassic Period, more than 145 million years ago. This carnivore, with its sharp teeth and hooked claws, was a terror to its prey. Readers of this enlightening volume will learn where these meat eaters roamed, what they hunted, and how their terrifying teeth compared to the teeth of the mighty T. rex! Well-organized and appealing information in tables, maps, and images will aid young paleontologists in their understanding of this reptile as well as the environment in which it lived.