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Pachyrhinosaurus canadensis skull, Royal Tyrrell Museum.
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Superorder: Dinosauria
Order: Ornithischia
Suborder: Cerapoda
Family: Pachyrhinosauridae
Genus: Pachyrhinosaurus
Sternberg, 1950

Pachyrhinosaurus was a large, plant-eating dinosaur that had a bony, spiked neck frill, four short legs, and a short tail. Pachyrhinosaurus was a short-frilled ceratopsian dinosaur that was 18 to 23 feet (5.5 to 7 m) long. Pachyrhinosaurus had many small horns on the middle of its frill.

Pachyrhinosaurus lived during the Late Cretaoeus period, about 73.5-69 million years ago and was similar to Achelousaurus.

Type specimen of Pachyrhinosaurus perotorum.
Type specimen of Pachyrhinosaurus vacniclod