With some of the most advanced chewing apparatus ever developed by a reptile, ornithopod dinosaurs became a most successful group of herbivorous dinosaurs. They rapidly became a prominent feature on North America's Cretaceous landscape, until they were wiped out by the famous Cretaceous-Tertiary, or K-T, extinction event. Learn more about ornithopod dinosaurs in this well-constructed overview produced by the BBC. This resource includes a series of videos and images showcasing ornithopod dinosaurs, as well as information on their habitat, distribution, behaviors, and more.