what do they look like? is esay~~

Sea turtles (Superfamily Chelonioidea) are turtles found in all the world's oceans except the Arctic Ocean. There are seven living species of sea turtles: flatback, green, hawksbill, Kemp's Ridley, leatherback, loggerhead and olive ridley. The East Pacific subpopulation of the green turtle has been classified as a separate species in the past as the black turtle. However, DNA evidence indicates that it is not evolutionarily distinct from the green turtle.
All but the leatherback are in the family Cheloniidae; the leatherback belongs to the family Dermochelyidae and is its only member.The Flatback turtle is found solely on the northern coast of Australia.
Although they have been present for tens of millions of years since the Mesozoic, the body plan of sea turtles has remained relatively constant. Sea turtles possess dorsoventrally-flattened bodies with two hind legs and highly-evolved paddle-like front arms. Different species are distinguished by varying anatomical aspects: for instance, the prefrontal scales on the head, the number of and shape of scutes on the carapace, and the type of inframarginal scutes on the plastron. The leatherback is the only sea turtle that does not have a hard shell, instead carrying a mosaic of bony plates beneath its leathery skin. It is the largest of the sea turtles, 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 1300 pounds (600 kg). Other species are smaller, being mostly two to four feet in length (0.5 to 1 m) and proportionally narrower.
The members of the superfamily have a general worldwide distribution. Sea turtles can be found in all oceans around the world except for the polar regions.[citation needed] Some species travel between oceans.
Sea turtles have an extraordinary sense of time and location. They are highly sensitive to the Earth's magnetic field and use it to navigate. The longevity of sea turtles has been speculated at 80 years. The fact that most species return to nest at the locations where they were born seems to indicate an imprint of that location's magnetic features. The Ridley turtles are especially peculiar because instead of nesting individually like the other species, they come ashore in one mass arrival known as an "arribada" (arrival). With the Kemp's Ridley this occurs during the day and on only one beach in the entire world. Their numbers used to range in the thousands but due to the effects of extensive egg poaching and hunting in previous years the numbers are now in the hundreds.
After about 30 years of maturing, adult female sea turtles return to the land to nest at night, usually on the same beach from which they hatched. This can take place every two to four years in maturity. They make from four to seven nests per nesting season.
All sea turtles generally employ the same methods when making a nest. A mature nesting female hauls herself onto the beach until she finds suitable sand on which to create a nest. Using its hind flippers, the female proceeds to dig a circular hole 40 to 50 centimeters deep. After the hole is dug, the female then starts filling the nest with eggs one by one until it has deposited around 150 to 200 eggs, depending on the turtle's species. The nest is then re-filled with loose sand by the female, re-sculpting and smoothening the sand over the nest until it is relatively undetectable visually. The whole process takes around thirty minutes to a little over an hour. After the nest is laid, the female then returns to the ocean.
You may find more about them in the webside

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請瀏覽以下網址:

http://www.cccturtle.org/sea-turtle-information.php?page=green
http://earthtrust.org/wlcurric/turtles.html
http://www.earlham.edu/~klostma/greenseaturtle.htm
http://www.seaturtleinc.com/turtles/green.html
http://en.wikipedia.org/wiki/Green_turtle