Temporal range: Upper Cretaceous
|Display at the Royal Ontario Museum|
Ornithomimus edmonticus was the largest species, 12 ft (3.5 meters) long, 7 feet (2.10 meters) high and weighed about 100-150 kg. It walked on two legs and looked slightly like an ostrich, except for its long tail.
In 1995, 2008 and 2009, three O. edmontonicus specimens with evidence of feathers were found. Two adults had quill knobs on the lower arm, indicating the former presence of bird-like feather shafts. A juvenile had impressions of long fluffy feathers in the form of hair-like filaments covering the rump, legs and neck.
- Claessens L; Loewen M. and Lavender Z. 2011. A re-evaluation of the genus Ornithomimus based on new preparation of the holotype of O. velox and new fossil discoveries. Journal of Vertebrate Paleontology, SVP Program and Abstracts Book, 2011, pp. 90.
- Zelenitsky D.K. et al 2012. Feathered non-avian dinosaurs from North America provide insight into wing origins. Science 338 (6106): 510–514. 
- Ornithomimus in The Dinosaur Encyclopaedia at Dino Russ' Lair