University of Idaho zoologist John Byers has suggested that the Pronghorn evolved its running ability to escape from extinct predators such as the American cheetah, since its speed greatly exceeds that of extant North American predators. Pronghorn can reach top speeds of around 55 mph and can run at a steady clip of 30 mph for over 20 miles! this is the pronghorn, probably the fastest antelope on earth. Read on to find out … Krasemann / Getty Images. Fastest animals in the world, ranked by their top speed on land. Pronghorn antelope – one of the fastest land animals, and the fastest antelope. For … It has shock-absorbing toes, hollow hair, thirteen “gears” (gaits, i.e. The pronghorn is the second fastest land animal in the world, and the fastest in North America. Conservation. Pronghorn 88.5 km / 55 m per hour. Fun cheetah fact: Whilst sprinting cheetahs spend more time in the air than on the ground…. They are able to run at speeds of about 60 miles per hour. The pronghorn is the second fastest land mammal in the world, after the cheetah. It might also be fun to know that the world's fastest animal all categories is the peregrine falcon, which can reach speeds of 389 km/h (242 mph) when diving. so they’re the fastest animal on land, but not actually on the ground too much when sprinting! Scientists believe that the pronghorn’s great speed is due to the animal’s evolution alongside the now-extinct American cheetah. Pronghorn bodies are incredibly designed for … S.J. The American antelope, or pronghorn, has the longest migration of any land mammal in the lower 48. It is also the fastest land mammal on the continent, capable of reaching speeds in excess of 55 mph. American cheetahs most likely fed primarily on American pronghorn, which are the second fastest land mammals on the planet. 2. pronghorn speed vs cheetah. The American antelope, or pronghorn, has the longest migration of land. 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