Science, Tech, Math › Animals & Nature Struthiomimus Share Flipboard Email Print Struthiomimus (Wikimedia Commons). Animals & Nature Dinosaurs Herbivores Basics Paleontologists Carnivores Dinosaurs & Birds Marine Reptiles Prehistoric Mammals Amphibians Birds Habitat Profiles Mammals Reptiles Wildlife Conservation Insects Marine Life Forestry Evolution View More By Bob Strauss Science Writer B.S., Cornell University Bob Strauss is a science writer and the author of several books, including "The Big Book of What, How and Why" and "A Field Guide to the Dinosaurs of North America." our editorial process Bob Strauss Updated March 06, 2017 Name: Struthiomimus (Greek for "ostrich mimic"); pronounced STROO-thee-oh-MIME-us Habitat: Plains of western North America Historical Period: Late Cretaceous (75 million years ago) Size and Weight: About 10 feet long and 300 pounds Diet: Plants and meat Distinguishing Characteristics: Ostrich-like posture; long tail and hind legs About Struthiomimus A close relative of Ornithomimus, which it closely resembled, Struthiomimus ("ostrich mimic") galloped across the plains of western North America during the late Cretaceous period. This ornithomimid ("bird mimic") dinosaur was distinguished from its more famous cousin by its slightly longer arms and stronger fingers, but because of the position of its thumbs it couldn't grasp food quite as easily. Like other ornithomimids, Struthiomimus likely pursued an opportunistic diet, feeding on plants, small animals, insects, fish or even carrion (when a kill was left unattended by other, larger theropods). This dinosaur may have been capable of short sprints of 50 miles per hour, but had a less taxing "cruising speed" in the 30 to 40 mph range.