Did dinosaurs really die out or is it possible they are still with us today? And what's bigger and scarier than the T-rex? From A to Z, D is for Dinosaur: A Prehistoric Alphabet provides the answers and current theories behind these questions, along with other fascinating aspects of prehistoric life. Paleontologists aren't the only ones who have made contributions to the study of dinosaurs. Some important discoveries were found by children, including 12-year-old Mary Anning Dramatic, action-filled paintings let readers of all ages roam the prehistoric world. From the ferocious Giganotosaurus (the biggest meat-eater known) to the most famous dinosaur that never lived (Ultrasaurus), budding scientists will discover new facts and explore challenging new theories in D is for Dinosaur.