Just something i am wondering about. I just posted some information about flourescence in a mantis shrimp: http://www.blueboard.com/mantis http://www.blueboard.com/mantis/pics/caldwell_shining.htm in a linked article someone noted that that this was the first case where a link between fluorescence and communication was found. Stomatopods have the most complex eyes in nature, and the hypothesis is that it uses this as a way to signal to other mantis shrimps. However, i remember reading about squids (or octopus?) using flourescence for communication as well...or am i mistaken?