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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 leatherback sea turtle is the largest sea turtle. It can grow up to 6.5 feet (2 m) long and weigh 1,400 pounds (636 kg). The leatherback gets its name from its shell, which is like a thick leathery skin, with the texture of hard rubber.eatherback sea turtles require warm tropical beaches to incubate their eggs. After mating with a male just off shore, the female waits for nightfall to clamber up the beach, dig a shallow pit in the sand, and deposit her eggs.