How can something so pretty be so deadly? Maybe it’s their hypnotic movement or their iridescent appearance when the light reflects in the shallow waters. Whatever it is, you don’t want to bump into one and if you’re a fish, you better swim far and wide. The gelatinous umbrella-shaped bell makes jellyfish unique in appearance. It is said that they are the oldest multi-organ animal and they are found in every ocean and at all depths.