Ornithomimusis a genus of ornithomimid dinosaur from the Late CretaceousPeriod of what is now North America. Ornithomimus was a swift bipedal theropod which fossil evidence indicates was covered in feathers. They were up to 3.7 meters (12 ft) long and weight up to 158.8 kilograms (350 lbs). Ornithomimus had legs that seem clearly suited for rapid locomotion, with the tibia about 20% longer than the femur. The large eye sockets suggest a keen visual sense, and also suggest the possibility that they were nocturnal. The diet of Ornithomimus is still debated since it had a toothless beak. As theropods, ornithomimids might have been carnivorous but their body shape would also have been suited for a partly or largely herbivorous lifestyle. Suggested food includes insects, crustaceans, fruit, leaves, branches, eggs, and the meat of lizards and small mammals.
Feathered ornithomimids make a brief cameo in the Late Cretaceous segment, living with Triceratops and Edmontosaurus possibly hunting for insects or small vertebrates. It was revealed on the website that these certain kind of ornithomimids are, in fact, Ornithomimus. After a while, the Ornithomimus runs away and is never seen again.