These are guys are everywhere in South Florida. Locals call them muscovy ducks, not sure why, they are not from Moscow. They are not even from Europe. These ducks are from South America. Their proper name is Cairina moschata. And, yes, they are invasive species. Apparently someone had brought them to Florida to farm them for food. But as you can tell, they have escaped and are running wild.
Here is one trying to get some food out of me. Surprisingly, they can fly. I was kind of shocked because they are so fat.