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the most curious thing about the pronghorn antelope, I find, is that it really isn't an antelope at all. It is the only surviving member of a family of mammals unique to America- the others all being extinct. And its existence supports the fact that prehistoric cheetahs once roamed North America- the only other land mammal faster than a pronghorn is the African cheetah; it evolved to escape a speedy predator that is no longer here.

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