Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Ornithischia
Family: Hadrosauridae
Subfamily: Hadrosaurinae
Genus: Gryposaurus
Species: G. Notabilis

Like all other hadrosaurids, Gryposaurus was a large herbivore (8m long) capable of both quadrupedal and bipedal locomotion. It lived in the North American continent during the Cretaceous, about 75 to 85 million years ago. It suffers from a long and complicated taxonomic history, like most dinosaurs, but the modern consensus is that there were at least 4 different species of the genus. The most distinctive feature of Gryposaurus is the raised nasal arch located above the 'duckbill' snout. The true behavioural purpose of this structure has raged for years, but it is likely some sort of intraspecies identifier, either as a visual trait or an organ capable of vocalization.

Type Specimen: NMC 2278. (1913). Sternberg, GF.

Type Species: Gryposaurus notabilis

Lambe, LM. (1914). On Gryposaurus notabilis, a new genus and species of trachodont dinosaur from the Belly River Formation of Alberta, with a description of the skull of Chasmosaurus belli. The Ottawa Naturalist Vol. 27, No. 11, pp. 145-155.

Locality:

Dinosaur Park Formation, Alberta, Canada.

Scientific Resources:

Gates, TA; Sampson, SD. (2007). A new species of Gryposaurus (Dinosauria: Hadrosauridae) from the late Campanian Kaiparowits Formation, southern Utah, USA. Zoological Journal of the Linnean Society Vol. 151, Issue 2, pp. 351–376

Ryan, MJ; and Evans, DC. (2005). "Ornithischian Dinosaurs", Dinosaur Provincial Park: A Spectacular Ancient Ecosystem Revealed. Bloomington: Indiana University Press, pp. 312-348

Horner, JR. (1979). Upper Cretaceous Dinosaurs from the Bearpaw Shale (Marine) of South-Central Montana with a Checklist of Upper Cretaceous Dinosaur Remains from Marine Sediments in North America. Journal of Paleontology, Vol. 53, No. 3, pp. 566-577.

Hopson, JA. (1975). The evolution of cranial display structures in hadrosaurian dinosaurs. Paleobiology Vol. 1, Issue 1, pp. 21-43.