Which dinosaur was the fastest?

Based on the trackways (stride lengths) found, it is difficult to name the fastest dinosaur. But scientists guess that the speediest dinosaurs were probably the small, two-legged, meat eaters, especially those with long, slim hindquarters and light bodies. These swift dinosaurs probably didn’t run any faster than the fastest modern land animals. One carnivorous dinosaur called Ornithomimus is thought to have run about 43 miles (70 kilometer) per hour—about the speed of a modern African ostrich.