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.

Additionally, many deep-sea fish have eel-like body shapes, which helps make backward swimming possible. The backward-swimming deep-sea fish typically measured between 1 and 2 feet in length and ...

At four hundred feet there came into view the first real deep-sea fish—Cyclothones, lanternfish, and bronze eels. The former meant nothing at first. I took them for dark-colored worms or shrimps.