It's March in South Florida. The beach towns are flush with young people looking for action and excitement. For one unlucky group of thrill-seeking spring breakers, their adventure leads to the black waters of the Florida Everglades - a place with mosquitoes the size of birds, snakes as long as school buses and tens of thousands of flesh-ripping alligators. But beyond the scope of the traditional predators famous for keeping the glades wild is another phenomenon - one with two legs and an insatiable thirst for killing.