The largest sea turtle, the Leatherback, can reach up to 2,200 pounds. Unlike other species of sea turtles, Leatherback turtles have a rubbery shell composed of cartilage-like tissues rather than a hard, bony shell. Leatherback turtles also live in waters of more of the world than any other sea turtle.
Green Sea Turtles are the only species of sea turtle that is an herbivore. These turtles got their name because their diet consists of seagrass and algae which contributes to the green color of their fatty tissue.