Here are some of the deep-sea animals that we do know something about. The pelican eel (Eurypharynx pelecanoides) is a type of gulper eel that uses its large, pelican-like mouth to gulp up its prey.

Some are terrifying... others are so bizarre, lurking in the depths of the ocean. Many otherworldly deep-sea creatures, though, are so beautiful and mysterious that you won't believe they exist.