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Loggerhead sea turtle hatchlings are packed into containers at the Gumbo Limbo Nature Center before being taken to a U.S. Coast Guard vessel for release in Boca Raton, Fla. Wilfredo Lee/AP hide caption

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Wilfredo Lee/AP

An illustration of Pappochelys, based on its 240-million-year-old fossilized remains. This ancestor to today's turtle was about 8 inches long. Rainer Schoch/Nature hide caption

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Rainer Schoch/Nature

How The Turtle Got Its Shell

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