Ornithomimosauria (meaning "bird-like lizards), is an extinct clade of theropod dinosaurs that resembles very much 

Gallimimus-head and neck

Ornithomimid typical head

the modern ostrich. They appeared as a clade in the early Cretaceous, as very basal forms, and l asted until the late Cretaceous era. Fossils of the clade's members have been found in Europe, Asia, North America and Africa.


General characteristicsEdit

Ornithomimids were herbivorous or homnivorous dinosaurs, that extracted most of their energy from plants.

Furthermore, they had some distinctive characteristics, as a relatively elongated skull, with large Orbital windows, a long S-shaped neck, long forelimbs, with three-digitated hands, and long hind limbs, that allowed them to reach high speeds, among the highest speeds among dinosaurs. Their skin-covering is not known, but ornithomimids, being Coelurosaurian dinosaurs, are considered to be covered in feathers.

Almost all ornithomimids had tooth-less beaks, apart from some species, as Pelecanimimus and Harpymimus, that had teeth in their mouth.


Ornithomimids were small to medium-sized dinosaurs, the biggest recorded Ornithomimid being Gallimimus bullatus , with high estimates at 8m (26ft) long. However, if Deinocheirus is considered to be an ornithomimid, it takes the primacy of
Human-gallimimus size comparison

Gallimimus size comparison

the biggest from the Gallimimus.


  • Pelicanimimus polydon;
  • Archaeornithomimus asiaticus;
  • Shenzhousaurus orientalis;
  • Harpymimus okladnikovi;
  • Hexing quingyi;
  • Beishanlong grandis;
  • Garudimimus brevipes;
  • Ornithomimidae:

Dubious SpeciesEdit

  • Deinocheirus mirificus