The footage, captured in Spain's Canary Islands, shows the female fish, whose Latin name translates to "black sea monster," swimming through the light-filled ocean waters off the coast of Tenerife.

The black seadevil (Melanocetus johnsonii), known for its bioluminescent lure and fearsome appearance, typically inhabits the ocean’s depths, between 650 and 6,500 feet. The fish was filmed by ...

So why retract them? Probably because they have a highly reflective layer that helps direct light outward. This shiny surface, in contrast to the fish's velvety black body, might inadvertently ...