Nov. 18, 2011: A photo provided by the USDA Wildlife Services shows a python curled up in a test trap at their research facility in Gainesville, Fla.  The trap patented by the USDA will test if pythons can be lured into traps. Pythons are invasive species that researchers believe are decimating populations of native mammals, especially in the Florida Everglades. (AP/USDA Wildlife Services, HO)