Washington's National Zoo Previews "American Trail" Exhibit

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Crystal, a female gray wolf, roams the new wold enclosure during a... News PhotoAnimal,Enclosure,Gray,Gray Wolf,Horizontal,Horticulture,Human Interest,Mountain Peak,New,Smithsonian National Zoological Park,The Americas,USA,Washington DC,WolfPhotographer Collection: Getty Images News 2012 Getty ImagesWASHINGTON - AUGUST 29: 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)