The scary-looking fish is usually to be found more than a mile below the surface, where little to no light penetrates.

But scientists have observed a free-living mushroom coral, Cycloseris cyclolites, actively “walking” toward blue light waves in a ... Indian Ocean and the Red Sea, according to Dr. Brett ...

But as the water gets deeper, the light able ... eye itself is a “blue silvery-blue circle (surrounding a) darker, central part of (the) iris,” according to the study. The fish’s forehead ...