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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.
Leatherback turtle consuming a jellyfish off Cape Cod. (NMFS Permit #1557-03). Weighing in at between 550 and 2,000 pounds with lengths of up to six feet, the leatherback is a big turtle! Leatherback sea turtles can be distinguished from other species of sea turtle by its lack of a hard shell or scales. Instead, leatherbacks are covered with a firm, rubbery skin. You can find leatherback sea turtles as far north as Canada and the northern Pacific Ocean. They tend to nest in the tropics, however. Within the United States, the leatherback is known to nest in southeast Florida, Puerto Rico, and the U.S. Virgin Islands.