Meet the anglerfish.
Spending their lives between 980 and 16,400 feet below the waves, anglerfish live in constant, complete darkness, luring prey using a bioluminescent protrusion in front of their mouths (hence the name).
With the help of this glowing lure, deep-sea anglerfish are a small marine creature’s worst nightmare.
These unusual creatures are noteworthy for their unusual mating habits, in which the males fuse to the female by biting into her belly and latching on for good. The male anglerfish spends the rest of his life like a parasite, being fed by nutrients from her blood, while he dangles there to fertilize her eggs.
Watch the first mating pair ever caught on camera in the video below.