TravelNevada.com says ...

"Twice the size of Rhode Island plus 250,000 football fields, the largest national wildlife refuge in the contiguous U.S. is found in Nevada, just north of Las Vegas. Established in 1936, southern Nevada’s Desert National Wildlife Refuge was created to protect a variety of species—a handful of which thrive here, and are found nowhere else on earth—but specifically to establish a protected habitat for desert bighorn sheep, the Nevada state mammal."
 

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Corn Creek - Desert National Wildlife Refuge - NevadaTravelNevada.com says ...
"Twice the size of Rhode Island plus 250,000 football fields, the largest national wildlife refuge in the contiguous U.S. is found in Nevada, just north of Las Vegas. Established in 1936, southern Nevada’s Desert National Wildlife Refuge was created to protect a variety of species—a handful of which thrive here, and are found nowhere else on earth—but specifically to establish a protected habitat for desert bighorn sheep, the Nevada state mammal."