Green sea turtles (Chelonia mydas) are known to migrate up to 1,600 miles to reach their spawning grounds. They usually return to the same beach where they were born to lay their eggs. Female green sea turtles lay between 60 to 200 eggs, but it is estimated that less than 1% of green sea turtles reach adulthood. Turtles must breathe air from the surface, but they can hold their breath for several hours at a time and even sleep underwater. We encountered this turtle while diving Gili Air. Read more in our post, A Scuba Divers Guide to Lombok, Indonesia.