Temporal range: Late Cretaceous
Corythosaurus is a genus of ornithopod was a large are plant-eating, duck-billed dinosaur. It was about 30-33 feet (9-10 m) long, 6.6 feet (2 m) tall at the hips, and may have weighed up to 5 tons. It had a hollow, bony crest on top of its long head in the shape of a helmet flattened on the sides (Corythosaurus means "helmet lizard"). Males had larger crests than females and juveniles.