The hadrosaur was an Earth dinosaur that lived in the Cretaceous period.

It was the most highly evolved cold-blooded organism to develop from the Eryops and was believed to have vanished when a mass extinction occurred at the end of the Cretaceous period. The hadrosaur was considered potentially to be a direct evolutionary predecessor of the Voth. (VOY: "Distant Origin", "Friendship One")

External link

• Hadrosaur at Wikipedia