These creatures fall under the category of "Invertebrates." This jelly fish can grow to 10" with a gas-filled balloon-like body. His tentacles can grow to 60' in length. He changes shape to catch wind and alter course. CAUTION! Tentacles should be avoided! They sting and can cause severe burns and blisters! Follow this link to learn more about Florida's unique marine environment, and how to treat a Man-O-War sting: