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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 is the only sea turtle that does not have a hard shell. Instead, it bears a mosaic of bony plates beneath its leathery skin. It is the largest sea turtle, measuring 6 to 9 feet (1.8 to 2.7 m) in length at maturity, and 3 to 5 feet (0.91 to 1.52 m) in width, weighing up to 1,500 pounds (680 kg). Other species are smaller, being mostly 2 to 4 feet (0.61 to 1.22 m) and proportionally narrower. The origin of sea turtles goes back to the Late Jurassic (150 million years ago) with genera such as Plesiochelys, from Europe.