Dinosaurs · Small ornithopod

Orodromeus

Say it or-oh-DROM-ee-us. The name means ‘mountain runner’.

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

Length: 2 m
Weight: 50 kg
Diet: Plant-eatertough plant material
Walked: On 2 legs
When: Late Cretaceousabout 74 million years ago
Fossils found in: USA
Named by: Horner and Weishampel (1988)
Family tree: Dinosauria › Ornithischia › Ornithopoda › Euornithopoda

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

Small ornithopods. Small, fast, two-legged plant-eaters. See all 12

Lived at the same time

Achelousaurus · same country
Bambiraptor · same country
Corythosaurus · same country
Dromaeosaurus · same country
Dryptosaurus · same country
Einiosaurus · same country
Euoplocephalus · same country
Gorgosaurus · same country

Other small ornithopods

Parksosaurus Late Cretaceous
Thescelosaurus Late Cretaceous
Zalmoxes Late Cretaceous
Gasparinisaura Late Cretaceous
Oryctodromeus Late Cretaceous
Leaellynasaura Early Cretaceous
Zephyrosaurus Early Cretaceous
Atlascopcosaurus Early Cretaceous

Source: Orodromeus 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.