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→Ornithischia
===''Ornithischia''===
===''Ornithischia''===
Species of this group were all herbivorous; most were quadrupedal. Front teeth were lacking, while a predentary bone was present in the front of the lower jaw. Several species (mainly within ''Ceratopsia'') had a distinctive parrot-like beak.
Species of this group were all herbivorous; most were quadrupedal. Front teeth were lacking, while a predentary bone was present in the front of the lower jaw. Many species had beaks, which leads many people to refer to them as beaked dinosaurs. Despite their name, which means "bird-hipped," Ornithischians were not the ancestors of modern birds.
*Ceratopsia
*Ceratopsia
::Species of this infraorder carried one or more horns on their heads, as well as a shield-like frill to protect the neck.
::Species of this infraorder carried one or more horns on their heads, as well as a shield-like frill to protect the neck.