Ornithomimus is from the Cretaceous and may have been an omnivore. That means it could have eaten plants- like fruits and leaves and animals like insects, small reptiles and mammals, maybe even eggs. They are the fastest dinosaur that existed. They can move at speeds of 50 miles per hour. They lived in Western North America during the Cretaceous. The most famous is Oren and Ollie the Ornithomimus twins and Mrs.Ornithomimus.