BADLANDS NATIONAL PARK, SOUTH DAKOTA - June16, 2014: A sign provided by the National Park Service that explains about Mesohippus or horse fossils that have been found in Badlands National Park, SD on June 16, 2014.

BADLANDS NATIONAL PARK, SOUTH DAKOTA - June16, 2014: A sign provided by the National Park Service that explains about Mesohippus or horse fossils that have been found in Badlands National Park, SD on June 16, 2014. - 139325995

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