Ornithomimidae

Fossil specimen of Ornithomimus sp. (TMP 1995.110.1), Royal Tyrrell Museum. This specimen was recovered from the middle Dinosaur Park Formation of Alberta, Canada.

Skull diagram featuring the holotype skull (ROM 1790) of the ornithomimid Rativates evadens, from the Late Cretaceous period. Abbreviations: d, dentary; f, frontal; l, lacrimal; m, maxilla; n, nasal; pm, premaxila; ps, paraphenoid.