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It's one of the greatest mysteries in the animal kingdom - how do sea turtles navigate?

Some sea turtle species can travel more than 10,000 miles in a single year. And females return to the same beach where they were born to lay their own eggs.

Nearly all species of sea turtle are threatened, so scientists are trying to understand how they navigate and where they go to help protect their habitats.

(Image: A sea turtle swimming in the ocean. Credit: Getty Images)