Florida’s Everglades National Park is one of the last great wildlife refuges in the United States, home to numerous unique and endangered mammals, trees, plants, birds and turtles, as well as half a million alligators. However, the Everglades is also the dumping ground for many animal invaders — more than 15 species of parrot, 75 kinds of fish and 30 different reptiles from places as far away as Africa, Asia and the Caribbean.