FILE - This May 28, 2009 file photo shows Skip Snow, left, and Theresa Walters, right, taking a Burmese python out of its cage before showing it to Interior Secretary Ken Salazar, not shown, in the Florida Everglades. The Burmese python is an invasive species is an invasive species in the Everglades. U.S. Sen. Bill Nelson called Tuesday, July 14, 2009 for organized hunts of thousands of pythons believed to be living in the Everglades to kill the snakes and prevent potential attacks. (AP Photo/Lynne Sladky, File)