Triplefin fish found to have controlled iris radiance
(PHYSorg.com Biology)

A team of researchers with the University of Tübingen in Germany has found an example of a fish that is able to control light reflected from organs next to its pupils-a form of photolocation. In their paper published in the journal Royal Society Open Science, the group describes their study of the fish and their findings and also offers some theories on the purpose of the skill.