The moon jellyfish (Aurelia aurita) is a common jelly that is easily recognized by its four horseshoe-shaped gonads, which are visible through the top of its translucent bell. The species gets its common name for the way its pale bell resembles a full moon. People frequently encounter moon jellyfish because of their abundance and preference for coastal waters. These jellyfish do sting, but their venom is mild and considered harmless. Any clinging tentacles may be rinsed off with salt water. The venom may then be deactivated with heat, vinegar, or baking soda.