Triceratop was a dinosaur from the late Cretacous period. It had the largest head for any dinosaur. It has a frill which can tell if it is a Triceratop, or to inteminate preditories. As for the horns it is used to defended it self. Mainly chargeing like a rhino. But a Triceratop does not use its horns just for defense but for fighting other males. Triceratops live in large heards consiting many males and females.