All of us are acquainted with the phenomenon of bioluminescence and most have seen it, one way or the other, with their own eyes, be it glowing plankton on the sea or a swarm of fire flies. Bioluminescence is relatively rare in land dwellers (some insects such as fireflies, earthworms, and glowing fungi build the exception) but could be called standard in ocean inhabitants. There are, in fact, many places in the open oceans where bioluminescence does occur in 80 to 90% of all organisms; it is used to find food, attract a mate, lure prey, camouflage, or fight off predators.