Given the extreme depths to which scientists must go to find these frightful–and tiny–fish, little is known about the hatchetfish. Making top models around the world jealous, the morose-looking creatures derive their name from how razor-thin they are. Anatomically speaking, the hatchetfish’s thorax is supposed to resemble the blade of the hatchet, and its cold, silver glint the metal. Their name is somewhat deceiving, though; measuring in at a mere one to five inches in length, the hatchetfish is hardly deadly. It’s just, well, pretty terrifying.