Leatherback

The largest of the sea turtles, leatherbacks reach more than 1.8 m (6 ft) in length and more than 640 kg (1,410 lbs) in weight. During their long migrations, leatherbacks regularly dive to depths greater than 1,000 m (3,281 ft) in search of gelatinous zooplankton to eat. Leatherbacks are rapidly declining in many areas of the world.