Hadrosaurs are known as duck-billed dinosaurs because of their long flattened snouts. This book explores what scientists know about these plant-eating dinosaurs and how this knowledge has changed over time. Young dinosaur enthusiasts will find out the latest information about where these dinosaurs lived, what they ate, and what ate them. They will learn about the purpose of the duck-shaped bills and their hundreds of sharp teeth, too. All this information is presented in an age-appropriate and friendly way and is supported by the full-color illustrations and photographs.