Carolina Wrens are one of the loudest birds for their size. These guys have a set of pipes to make Bessie Smith jealous. They are our most common wren in Florida, and they're the only wren we have the privilege of seeing and hearing year-round. If you're lucky, you may see one sporting white spots on its rump. I don't know the purpose of these spots, or why they are only sometimes visible. It may be a display of some sort, but I've also seen photos of them with their spots visible while resting.