The Suborder Ceratosaura is a group of reptiles that includes the horned dinosaurs, also known as ceratopsians. Some synonyms for this subgroup include the infraorder Neoceratopsia, and the superfamily Ceratopsia. These names refer to the characteristic horned frills and beaks of these animals. Ceratopsians were herbivorous and ranged in size from small, dog-sized creatures to massive, rhinoceros-like beasts. They lived during the Late Cretaceous Period, between 100 and 66 million years ago, and evolved in North America before spreading to Asia. Famous examples of ceratopsians include Triceratops, Styracosaurus, and Protoceratops.