The second constituent of the great jelly population of the plankton community, these supremely transparent predators appear to be limp, lifeless and lazy. In reality they are as carnivorous and cunning as many a science fiction felon. Mixed swarms of gigantic proportions inhabit parts of all the major oceans and recently some have invaded inland water bodies such as the Balck Sea and now threaten to annihilate the local fishing industry. Some comb jellies feed avidly on their own cousins, as exhibited in this panel.

Many comb jellies are relatively large, up to 180 cm in the case of one weird strap-shaped species, and all are characterised by the most spectacular flashing comb plates that catch the sunlight and split it like a prism into its rainbow colours. Most individuals also glow with shifting bioluminescence at night giving whole acres of ocean an eerie, flashing green glow, as ships pass through. Many comb jellies frequent the North Sea and are easily seen in calm conditions from ferries and cruise ships.