Introduction to Ornithopoda

The Ornithopoda are a group of medium to large plant-eating dinosaurs. They include one of the earliest discovered dinosaurs, Iguanodon, as well as the famous crested and "duck-billed" hadrosaurs. Several of these are noted for the spacious and bizarrely shaped sinus regions in their skulls. All ornithopods were herbivores and mostly bipedal.

Ornithopods are one of three major groups of Ornithischia, or "bird-hipped" dinosaurs. They are closely related to the Marginocephalia.