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Yellowstone National ParkJuvenile Bighorn Sheep casually amble along a precipice near Tower Falls.
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Yellowstone National Park
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Prior to the establishment of the National Park Service, the U.S. Army protected Yellowstone between 1886 and 1918. Fort Yellowstone was established at Mammoth Hot Springs for that purpose.

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Last Updated: May 29, 2007 at 11:57 EST