Invasive species threaten Florida

A stunned iguana lies on the sidewalk after having fallen from a tree Wednesday, Jan. 6, 2010, in Surfside, Fla. With temperatures in the 40s, many of the cold-blooded non-native species became immobilized in the cold temperatures, fell from their perches and died. The non-native species'... WILFREDO LEE, THE ASSOCIATED PRESS FILE