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Worldwide, six of the seven sea turtle species are classified as threatened or endangered due to human actions and lifestyles. The biggest threats include: 1  Entanglement in fishing gear. 2  Poaching and illegal trade of eggs, meat, and shells. 3  Coastal development. 4  Plastic and other marine debris. 5  Global warming.
The largest of the sea turtles, the leatherback can reach over 1.8 m (6 ft) in length and 680 kg (1,500 lb) in weight.uring their long migrations, leatherbacks regularly dive to depths greater than 1,000 m (3,281 ft) in search of gelatinous zooplankton to eat. The leatherback is rapidly declining in many areas of the world.