Crystal, a female gray wolf, roams the new wold enclosure during a sneak peak of the new American Trail at the Smithsonian National Zoo August 29, 2012 in Washington, D.C. The trail, featuring animals... more 
Crystal, a female gray wolf, roams the new wold enclosure during a sneak peak of the new American Trail at the Smithsonian National Zoo August 29, 2012 in Washington, D.C. The trail, featuring animals and horticulture native to the Americas, opens to the public on September 1. (Photo by Allison Shelley/Getty Images) less 
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Sat, Sep 1, 2012 1:00 PM EDT