Species

In the abyssal plains, unique forms of life develop. Animals that live in this deep-sea zone includebasket stars, seapigs, and seaspiders. Some crustaceans living at these depths have evolved without eyes, since they must rely on other senses to survive due to the absence of sunlight.

A new study demonstrates thatlarge predatory fishes like sharks, tunas and billfish make a surprising number of visits to the deep ocean—particularly the mesopelagic zone, which is found between 200 to 1,000 meters below the surface