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Cats, dogs and robots built for speed

by Meredith Hanel, guest writer When it comes to speed, the cheetah reigns. Crowned the fastest land animal, the cheetah can reach 110 km per hour. The fastest dog, the greyhound, can run about 70 km per hour. To find tune their bodies for speed, cheetahs have had 8.5 million years of natural selection and dogs