Struthiomimus was a fast-running dinosaur that lived during the Late Cretaceous period, around 76 to 75 million years ago. It belonged to the group of dinosaurs known as ornithomimids, which are characterized by their bird-like features. Struthiomimus had long legs, a slender body, and a long neck, resembling modern-day ostriches. This dinosaur was primarily herbivorous, feeding on plants and possibly small animals. Its beak-like mouth was well-suited for foraging. Fossils of Struthiomimus have been found in North America, providing valuable insights into the diversity of dinosaurs during its time.