Despite alligators ruling the swamplands of the Everglades for millennia, the last 500 years have brought deadly new predators that challenge their reign. And the origins of these international invaders are just as unexpected as their impact on the Everglades. So, what exactly is threatening this biodiverse region? Kenny Coogan explores the unique and precious ecosystem. Lesson by Kenny Coogan, directed by Doug Alberts, Noodle.