Corythosaurus, whose name means "helmet lizard," had a large crest on top of its head. Corythosaurus belonged to the family of duckbill dinosaurs called hadrosaurids. Among other hadrosaurid members were Bactrosaurus, Lambeosaurus and Edmontosaurus.

Corythosaurus appeared after Bactrosaurus but just before Edmontosaurus. It was the only group of duckbills to have a crest on its head. The crest was hollow, narrow, and shaped like a dinner plate. Females and young had smaller crests than males.

Corythosaurus was probably used to feeding on small lizards, insects colonies, and plants. It had a toothless beak with which it woyld scoop up its food. From fossil remains it seems to have been about 30 feet long and probably weighed around 3 tons. Its big, heavy tail would be useful for keeping it balanced while it stood on its back legs and slowly munched food.

Location: Canado, USA

Diet: Plants

Size: Length 10m

      Weight 3.8 tonnes

Classification:

Family Lambeosauridae

Suborder Ornithopoda

Order Ornithischia

Time (million years ago): 75