Ornithopods, or bird-like dinosaurs, were herbivores that thrived mostly in North America during the Cretaceous period, between 145 million and 65 million years ago. This title explores many different ornithopods and why they had unusual features such as crested heads or duck bills. From fossil evidence, paleontologists have determined more and more about how these dinosaurs ate, moved, communicated, and cared for their young. Fascinating subjects such as what we know about prehistoric plants and dinosaur food chains are explored in this engaging guide.