Horns, bony frills, and a parrotlike beak were the trademarks of the ceratopsians. They were all quadrupedal herbivores, and many ceratopsians lived in great herds. Most ceratopsians can be divided into two groups. One group had short neck frills, the other had long neck frills. The ceratopsians were among the last dinosaurs to become extinct.

Psittacosaurus skull

Psittacosaurus This dinosaur was a 61/2-ft-long (2 m) bipedal ancestor of the ceratopsians. It had a parrotlike beak and a very small neck frill, but lacked the horns of ceratopsians.

Ceratopsian facts

• The name ceratopsian means "horned face."

• They ranged in length from 6 ft (1.8 m) to 24 ft (7.5 m).

• Lived 110-65 million years ago

• Most had a toothless beak, horns, and a decorative head frill.

Protoceratops Protoceratops was the first true ceratopsian, with a turtlelike beak and a small frill. The first dinosaur eggs ever to be found belonged to protoceratops.

• The name ceratopsian means "horned face."

Dinosaurs Anatomy Triceratops
Rostral bone at tip

Triceratops Among the ceratopsians, Triceratops was one of the last and the largest. Herds of Triceratops roamed through forests, chopping vegetation with their beaks. At the tip of the beak was a rostral bone, which was common to all ceratopsians.

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