- Length
- 4 m
- Diet
- Ate plants and animals
- When
- Late Cretaceous74 to 66 million years ago
- Fossils found in
- Canada, USA
- Named by
- Marsh (1890)
- Family tree
- Dinosauria › Saurischia › Theropoda › Ornithomimosauria › Ornithomimidae
Large theropods. Big two-legged meat-eaters, such as Tyrannosaurus. See all 63
Lived at the same time
- Dryptosaurus · same country
- Edmontosaurus · same country
- Thescelosaurus · same country
- Chirostenotes · same country
- Pachyrhinosaurus · same country
- Arrhinoceratops · same country
- Achelousaurus · same country
- Alamosaurus · same country
Other large theropods
- Abelisaurus Late Cretaceous
- Dromiceiomimus Late Cretaceous
- Tarbosaurus Late Cretaceous
- Albertosaurus Late Cretaceous
- Daspletosaurus Late Cretaceous
- Rajasaurus Late Cretaceous
- Alioramus Late Cretaceous
- Indosuchus Late Cretaceous
Source: Ornithomimus 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.