Or Florida Swamp Ape. Different folks call it different things. Me, I reckon that, like the monkeys of Silver Springs*, it was an animal (I'm guessing an orangutan, or more than one) left or escaped during the filming of a B jungle picture and set up shop along I-75. Though I also dig the idea that it's an indigenous species that attacked conquistadors when they came to close to the fabled fountain, Either way, Pee-yoo!
*yes, I know the Tooey version of the monkey story, I prefer the Tarzan version, anachronistic though it may be)