Deinocheirus mirificus is an exceptionally large ornithomimosaur from Asia. The largest theropod that isn't a strict carnivore, Deinocheirus is from the Late Cretaceous and is comparable in size to Tyrannosaurus.

An exceptionally bizarre animal, Deinocheirus is an extremely unique theropod with a body plan like no other. Often compared to a giant goose, Deinocheirus's skull is more comparable to its smaller relative Gallimimus than similar sized theropods. With its long arms and humpback, Deinocheirus appeared to have a sort of "potbelly", giving it a uniquely slouched appearance. It is covered from head to toe in a layer of shaggy feathers in two of its 3 skins. Deinocheirus's impressive size and unique adaptations has helped it stand out and become one of the most interesting dinosaurs ever known.