The leatherback sea turtle is the largest living member of the order Testudines (turtles), and the heaviest reptile outside of crocodilians. Its shell can measure nearly 7 feet in length, and it can weigh well over 1,500pounds.
The leatherback is unique among other sea turtles, because its tear-drop shaped shell is covered in leathery skin and tiny osteoderms (small bony structures). Most turtles have a fully hard carapace made of bone. The skin of the leatherback is thick and rubbery, unlike the scaly skin of most sea turtles.
Like other turtles, leatherbacks lack teeth, but their beaks have teeth-like points, and their throats are lined with spines that help them swallow food.
Leatherbacks are dark gray to black in color above, and lighter below.