It is difficult to name the fastest dinosaur based on the few trackways found, but some information has been gathered by analyzing the tracks. The speediest dinosaurs were probably the small, bipedal carnivores, especially those with long, slim hind limbs and light bodies. These swift dinosaurs probably didn’t run any faster than the fastest modern land animals. One carnivorous dinosaur called an Ornithomimus is thought to have run about 43 miles (70 kilometers) per hour, which is about the speed of a modern African ostrich.