👉 The term "ornithomimus" is a name given to a type of dinosaur that lived during the late Jurassic period. It was one of the largest dinosaurs known, reaching up to 35 feet (10 meters) long and weighing over 25 tons (18 tons). The ornithomimus had four legs with six toes each, which it used for walking and running. Its teeth were also very large, allowing it to crush its prey into small pieces before swallowing.