Dinosaurs · Large ornithopod

Prosaurolophus

Say it proh-sore-oh-lof-us. The name means ‘before lizard crest [Saurolophus]’.

Prosaurolophus beside a person 1.75 m tall. Ticks mark every metre.Body shape drawn for this site, showing the general build of large ornithopods

Length: 7.6 m
Diet: Plant-eater
When: Late Cretaceous77 to 75 million years ago
Fossils found in: Canada, USA
Named by: Brown (1916)
Family tree: Dinosauria › Ornithischia › Ornithopoda › Hadrosauridae › Euhadrosauria › Hadrosaurinae

Where Prosaurolophus sits in the age of dinosaurs.Periods from the ICS chart; dinosaur dates from the Natural History Museum

Large ornithopods. Big plant-eaters that walked on two or four legs, including the duck-billed dinosaurs. See all 36

Lived at the same time

Achelousaurus · same country
Albertaceratops · same country
Avaceratops · same country
Bambiraptor · same country
Chirostenotes · same country
Dryptosaurus · same country
Gorgosaurus · same country
Gryposaurus · same country

Other large ornithopods

Parasaurolophus Late Cretaceous
Corythosaurus Late Cretaceous
Edmontosaurus Late Cretaceous
Gilmoreosaurus Late Cretaceous
Hadrosaurus Late Cretaceous
Kritosaurus Late Cretaceous
Lambeosaurus Late Cretaceous
Rhabdodon Late Cretaceous

Source: Prosaurolophus in the Natural History Museum Dino Directory, read 12 November 2026. Sizes are the museum's estimates for a typical adult. "Lived at the same time" lists dinosaurs whose dates overlap, which does not always mean they met.