Juan Lopez reads meters with one eye and looks for snakes with the other. Lopez is a member of the "Python Patrol," a team of utility workers, wildlife officials, park rangers and police trying to keep Burmese pythons from gaining a foothold in the Florida Keys. Officials say the pythons — which can grow to 20 feet long and eat large animals whole — are being ditched by pet owners in the Florida Everglades, threatening the region’s endangered species and its ecosystem
