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This is what the blue sea slug that I talked about yesterday eats, the venomous, Portuguese man-of-war.The Portuguese man-of-war is a siphonophore, an animal made up of a colony of organisms working together. It gets its name from the uppermost polyp, a gas-filled bladder, or pneumatophore, which sits above the water and somewhat resembles an old warship at full sail. The tentacles of the man-of-war can extend 165 feet in length below the surface, although 30 feet is more the average. They are covered in venom-filled nematocysts used to paralyze and kill fish and other small creatures. They have no independent means of propulsion and either drift on the currents or catch the wind with their pneumatophores.