Living near the end of the Dinosaur Age, Corythosaurus, or helmet head, was a large hadrosaur. A hadrosaur is a duck-billed dinosaur. Like other hadrosaurs, it had a toothless beak with rows of sharp teeth located in the back of its mouth.
The name Corythosaurus comes from its crest, which looks like a helmet worn by ancient soldiers. This crest was probably used to make a loud horn noise. Air from the animal’s nostrils was forced through the crest making it vibrant loudly.
Corythosaurus was named in 1914 by Barnum Brown. Since that time, a large number of Corythosaurus fossils have been discovered throughout western North America.