Bioluminescence (light produced by a chemical reaction that originates from the organism) is common in deep sea creatures such as squids and cuttlefish, but it is very rare among octopods. Light organs have only been seen in breeding octopod females of two genera. The exciting discovery of bioluminescence in a deep-sea finned octopod, Stauroteuthis syrtensis, is the focus of this week's In the...