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Temporal range: Late Cretaceous
Corythosaurus casuarius
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Ornithischia
Family: Hadrosauridae
Subfamily: Lambeosaurinae
Genus: Corythosaurus
Brown, 1914
  • C. casuarius Brown, 1914 (type)

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 weighed 3-5 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.