Deinocheirus is the largest known member of the dinosaurs known as “ostrich dinosaurs” (ornithomimosaurs), which also includes Gallimimus, Ornithomimus and Struthiomimus. It had a long, narrow snout that was similar to the unrelated duck-billed hadrosaurs (like Edmontosaurus and Parasaurolophus).
It had the longest known arms of any known two-legged dinosaur. Each arm was almost eight feet in length! For a long time these were the only known bones from Deinocheirus. But later discoveries gave scientists more information about the whole animal. It was bulkier than other ostrich dinosaurs, and had a “hump-backed” appearance, due to the tall neural spines on its back vertebrae.
Ornithomimosaurs were known to be feathered, so it is believed that Deinocheirus was probably covered in feathers.
SIZE: 38 feet (11.5 meters)
WEIGHT: 5 tons (5.5 short tons)