 This is another National Wildlife Refuge Minute. Crystal River National Wildlife Refuge in Florida is home to a myriad of species, but there's one in particular for which it's known, the West Indian manatee. Manatees inhabit these shelter waters year-round, and Crystal River Refuge was created specifically for their protection. But manatees float right beneath the surface, making them very hard to see, especially from a moving boat. And deep cuts from low propellers are one of their biggest threats.