The ornithischians were all herbivores and had two-and four-legged types. There were the four-legged armored dinosaurs such as Ankylosaurus and Stegosaurus. There were large, horned dinosaurs such as Eucentrosaurus and Triceratops. Two-legged types included Iguanodon, and many of the duck-billed dinosaurs (hadrosaurs), such as Corythosaurus, Lambeosaurus, and Maiasaura.