The fastest land animal is the CHEETAH, which is a large feline that can reach speeds of up to 75 mph. Cheetahs are native to Africa and parts of the Middle East, and they are the only species of big cat that cannot roar. They are also the only species of big cat that can purr. Cheetahs have long legs and a slender body, which helps them to run quickly. They are also known for their distinctive black tear-like markings on their faces.