The answer to this question is difficult to determine definitively as there are a number of factors that can affect an animal's speed and endurance. However, some experts believe that the cheetah is the fastest land animal, while the ostrich is considered to be the animal with the greatest endurance.
The cheetah, a member of the cat family, is built for speed. It has long legs and a slender body, which helps it to reach speeds of up to 70 miles per hour (mph). The cheetah also has special pads on its feet that give it traction when running. These adaptations make the cheetah well-suited for short bursts of high-speed running, but not for long distances.
The ostrich, on the other hand, is built more for endurance than speed. It can run at speeds of up to 40 mph but can maintain this pace for much longer periods of time than a cheetah. The ostrich also has large lungs and heart that help it to process oxygen more efficiently and keep going even when fatigued. Additionally, its two-toed feet allow it to cover more ground with each stride than other animals with four toes or hooves.
So which animal is faster? It depends on what you mean by "fast." If you are looking for an animal that can reach high speeds quickly but only over short distances, then the cheetah is probably your best bet. But if you want an animal that can sustain a fast pace over long distances, then the ostrich may be your best choice.