Watch full episodes and play Dinosaur Train games at http://pbskids.org/dinosaurtrain !
Why do some dinosaurs have horns? Dr. Scott teaches us that we used to think they had them so they could fight with big predators, but now we understand that they were to intimidate, show off, and fight with their own species.
Watch and play more games at http://pbskids.org or download the *FREE* PBS KIDS Video and Games app at http://pbskids.org/apps/
