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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.
Estimated numbers left in the wild: 60,000 (very approximate). Leatherback sea turtles are the largest turtles in the world, and are fourth in size among all current reptiles. Their body is protected only by leathery, oily skin, rather than a hard shell. The leatherbackâs front flippers can grow to a spread of 2.7 meters, and the animal itself measures from 1.8 to 2.2 meters long.