The disappearance of raccoons and bobcats from the Everglades National Park can be credited to one single event, according to a new study: a python invasion. Sightings of medium sized mammals are down by 99 percent in areas where giant constricting snakes from Asia have been spotted. The growing concern is that the snakes, which can live up to 35 years are feeling quite at home in Florida and the damage they are doing to the local environment is permanent