The Atlantic Portuguese Man of War actually is not a jellyfish but a siphonophore. It has a very complicated makeup. The color is a blue bottle hue that could be easily be mistaken for a rounded off granite rock. It lives on the surface of the water, has no way of propulsion and moves according to the wind, currents and tides. Many hundreds washed up one the South Wales Coast this week after a large storm at sea. Unfortunately the whitish one we saw did not live.