The term 'EXTREMELY FAST RUNNER' can be summed up by the crossword solution 'CHEETAH'. Cheetahs are the fastest land animals in the world, capable of reaching speeds of up to 75 miles per hour. They are found in parts of Africa and the Middle East, and are known for their distinctive spotted coats and long tails. Cheetahs are also the only big cats that cannot roar, instead they purr like a house cat.