Triceratops and its relatives were large plant-eating dinosaurs very similar to the modern rhinoceros. They even had large horns like the modern animal. Members of the Triceratops family were large, bulky animals that walked on all fours. They are thought to have lived in herds. As well as their huge horn, they had an enormous bony frill. It extended from the back of the head and over the shoulders, often with more spikes and horns attached. Triceratops reached a length of 9 m and a weight of about 5.5 tonnes.
Triceratops and its relatives probably used their horns in defence against attacks from flesh-eating dinosaurs. The frill might have been used by rival animals to create a threatening display.
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