Did the American Cheetah Make the Pronghorn Fast?

The American pronghorn is the second fastest land mammal on the planet - reaching speeds of fifty miles an hour. But it’s pace long baffled scientists. It’s speculated that an arms race between the american cheetah and the pronghorn may be the reason for the antelope’s remarkable speed.

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Clip Season 35 Episode 5 Length 01:46 Premiere: 11/09/16

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