Taking to the seas an estimated 250 million years ago, the only thing that ties these marine reptiles to land is the annual laying of their eggs. There are seven species of sea turtle, all of them having hard shells with plates, except the Letherback sea turtle. The Letherback has a shell made up of bones contained within lethery skin and can reach sizes of 7 feet and wiegh up to 1300 lbs. Almost all species are in danger in some way, mainly due to modern fishing practices. Sep 29
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Sea Turtle Evolution It is believed that the first sea turtles roamed Earth more than 250 million years ago. It is believed they were part of the late Jurassic Period based on fossil records. It is believed that these sea creatures where once land animals that evolved to spend most of their time in the water in order to survive. It is suggested that they once had four appendages instead of the flippers they have today. They were very similar to land turtles but much larger.