Many jellyfish are colored and are considered to be among the most beautiful of animals.
A mouth is located on the underside and tentacles dangle from the bell margin. Most catch their prey with stinging cells located in the tentacles and most are marine, living in ocean depths and along the coasts. A potato genetically-modified with jellyfish genes which glows when it needs watering is created by Edinburgh scientists. The genetically altered baby mice glow green in the dark. Portuguese Man O'War Australia's box jelly is the world's most dangerous jellyfish.