Usually, sea slugs use their rough tongues to scrape food off the seafloor. But this mysterious, bioluminescent mollusk uses ...

Hypnotizing footage reveals a never-before-seen swimming sea slug that eats using a large jelly-like hood and glows to defend itself from predators. Living at depths of between 3,300 and 13,100 ...

Watch fish expert Ollie Crimmen explain more about these deep-sea dwellers. Lanternfishes have light-producing organs on their bodies that are called photophores. This light is created by a chemical ...