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A female cheetah (Acinonyx jubatus) on the Phinda Private Game Reserve, KwaZulu-Natal, South Africa. Cheetahs accelerate from 0 to 60 miles per hour (0 to 97 km/h) in less than 3 seconds and average 40 mph (64 km/h) during a chase. The species is classified as vulnerable, with only 7,000 left in the wild.Photograph: Charles J. Sharp
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