Wind-driven bubble of Portuguese man o'war (Physalia physalis). - stock photo

Over/under view of a Man of War, also known as Portuguese Man of War, Physalia physalis. The Man of War is a jelly-like marine invertebrate of the family Physaliidae. The name "man-of-war" is borrowed from the man-of-war, an 16th century English armed sailing ship, more than likely due to the bladder which acts as a sail for the marine organism. View shows both the air bladder keeping the organism afloat and the stinging tentacles. Winds, seas and currents drive the movement of this organism.