An expanding network of trails will let creatures great and small roam around to bring them closer to visitors and raise conservation awareness. Source: With Treetop Trail, Philadelphia Zoo Opens Grounds to Prowlers ; ;Related ArticlesTons of Coal, Destination UnknownNuclear Plants, Old and Uncompetitive, Are Closing Earlier Than ExpectedIn Colorado, Nature Takes a Fiery Toll Despite a Community’s Efforts to Prepare ;

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With Treetop Trail, Philadelphia Zoo Opens Grounds to Prowlers