According to the Jellyfish Flickr group, Jellyfish are the beautiful ghosts of the sea. The group members share fabulous striking shots of these ephemeral beauties. Remember you always can find thousands of other jellyfish pictures searching for jellyfish tag, like the one bellow.

PS.: Don't be fooled by the beauty of those incredible creatures: they aren't so nice when you know them "in person". I know, I "met" an água-viva (the Portuguese word for them) a long time ago.