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Glow in the Dark Deep-Sea Species

The phenomenon of bioluminescence

The kitefin shark is now the biggest-known luminous vertebrate and inhabits the deep sea. PC: Dr. J. Mallefet - FNRS, UCLouvain
Comb-jelly luminescence isn't fully understood. It's thought to be defensive, but we don't know for sure. PC: Steve Haddock/Monterey Bay Aquarium Research Institute.
The Abraliopsis Squid uses illumination to blend in with the sky. PC: Steve Haddock/Monterey Bay Aquarium Research Institute.
The bioluminescent blackbelly lanternshark, as seen from a view beneath the animal. PC: Jérôme Mallefet.