Dracolestia xengola

The Dracolestia xengola, also called the Eurpoan Dragon, due to it's appearance, can be found under the surface of the moon Europa of Jupiter. It gives of a lot of bioluminescent light to attract small prey, however it can 'turn off' this natural form of lighting when it is threatend or when it has eaten it's fill to disappear back into the abyss.