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.

In this new translation, derived from the most recently updated edition, each dinosaur is explored in just the right amount of detail for young paleontologists, as this book brings these magnificent creatures to life again. The book communicates the scientific facts about dinosaurs in ways kids can understand through both simple but informative Spanish-language text and kid-friendly illustrations clearly labeled in Spanish.

Gail Gibbons's books have won many honors, including the Washington Post/Children's Book Guild Nonfiction Award and the NSTA Outstanding Science Trade Book awards.