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A desert reserve on the edge of a big city

You don't have to spend several days on the back of a mule to find yourself deep within a desert where mountain lions still roam free.  The McDowell Sonoran Preserve is just a few minutes' drive from downtown Scottsdale, Arizona. It's the largest urban nature reserve in the United States - home to more than 750 species of native plants and animals. Eventually, the McDowell Sonoran Preserve will be linked by wildlife corridors to the enormous Tonto National Forest to create the largest protected desert in the country.