The leatherback turtle, or sometimes referred to as the lute turtle, is the largest of all living turtles, and is the fourth-heaviest modern reptile, behind three crocodilians. It is the only living species in the genus Dermochelys. It gets its name, because it is easily distinguishable from modern turtles from the lack of a bony shell, it is instead covered by skin and oily flesh. Leatherback turtles diet mainly on jellyfish, and are found throughout almost the entire open ocean.
Mating takes place at sea. Male turtles never return back to land, unlike females, who show up only to lay their offspring. Females mate every two to three years, but they can breed annually. Fertilization is internal, and the female is usually mated with several males.