Animal movements are usually based on where they live (land, water, or both), how they obtain food, reproduce, and how they protect themselves. Some animals travel very long distances to find warmth and food, or to give birth to their young. Some of the fastest moving mammals in the world live in the grasslands, where there are large open spaces for running. The cheetah chases its prey at speeds of up to 70 miles an hour. Zebras, antelopes, and ostriches can run fast to escape from their predators. Some animals fly such as eagles and parrots to protect themselves.