Go wild at the zoo
DENVER – A lizard lazily lays along a tree branch at the Denver Zoo July 21, 2012. The zoo is home to 188 species that are considered to be threatened or endangered, while three species are actually extinct in the wild. (U.S. Air Force photo by Staff Sgt. Nicholas Rau)

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Photo by: Staff Sgt. Nicholas Rau |  VIRIN: 120725-F-EB935-022.JPG