Note
Bioluminescence, which is the ability of an organism
to emit ~ible light, is a common attribute of
marine creatures. The phenomenon is relatively rare
on land, where fireflies are the best-known example.
In the oceans it is ubiquitous, and is found at
all depths. The most common sources in the marine
environment are bacteria, dinoflagellates, jellyfish,
crustaceans, cephalopods, and fish.