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Sea turtles (Chelonioidea) are turtles found in all the world's oceans except the Arctic Ocean, and some species travel between oceans. The term is US English. In British English they are simply called "turtles"; fresh-water chelonians are called "terrapins" and land chelonians are called tortoises.
All but the leatherback are in the family Chelonioidea. The leatherback belongs to the family Dermochelyidae and is its only member. The leatherback sea turtle is the largest, measuring six or seven feet (2 m) in length at maturity, and three to five feet (1 to 1.5 m) in width, weighing up to 2000 pounds (about 900 kg). Most other species are smaller, being two to four feet in length (0.5 to 1 m) and proportionally less wide. The flatback turtle is found only on the northern coast of Australia.
- Joyce, Walter G. (2017). "A review of the fossil record of basal Mesozoic turtles". Bulletin of the Peabody Museum of Natural History 58 (1): 65–113. . https://pdfs.semanticscholar.org/1376/536c2532f31d85abb717ad953a4b283d7cab.pdf?_ga=2.250513540.362473231.1559202212-723086894.1556281898. Retrieved June 2, 2019.
- Spotila, James R. 2004. Sea turtles: a complete guide to their biology, behavior, and conservation. Baltimore: Johns Hopkins University Press. ISBN 0-8018-8007-6
- Davidson, Osha Gray. 2001. Fire in the turtle house: the green sea turtle and the fate of the ocean. United States: United States of Public Affairs. ISBN 1-5864-8199-1
- Witherington, Blair E. 2006. Sea turtles: an extraordinary natural history of some uncommon turtles.
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- Underwater video of turtles in the Red Sea, Egypt
- Preserving Turtles