Dracorex, meaning “dragon king”, is a genus of dinosaur from the Late Cretaceous Period of North America. The type species, D. hogwartsia, is known from one nearly complete skull and four cervical vertebrae. The remains were discovered in the Hell Creek Formation in South Dakota by a group of amateur paleontologists from Sioux City, Iowa. It was formally described by Bob Bakker and Robert Sullivan in 2006. The species name hogwartsia was inspired by the Harry Potter series of books by J.K. Rowling. The name came from the Hogwarts School of Witchcraft and Wizardry, a fictional school from the popular series.
Dracorex was an herbivore. Its skull had spiked horns, bumps, and a long muzzle. The flat skull was also heavily armored. Aside from having an unusually flattened skull, a prominent feature of the dinosaur was a pair of huge, unrestricted temporal openings in the skull. The presence of these temporal openings may indicate primitiveness in the specimen. The specimen recovered was most likely a young adult, or nearly matured. Although, some other evidence may indicate that the specimen was in fact a juvenile. The recovered Dracorex was about 10 feet long.