Cheetahs are the fastest land animals in the world, they can run up to 61 miles per hour. The main reason why cheetahs can run so fast is that they have a hyper flexible spine. Unlike ours, a Cheetahs spine can bend and flex in almost any direction. Another helpful feature is the black markings on their face. Just like we wear eye black, cheetahs have there's built always on. This helps to improve their vision and reduce the glare from the sun.