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Home > Animals> Marine Life
Sea turtles (superfamily Chelonioidea) are turtles found in all the world`s oceans except the Arctic Ocean. The East Pacific subpopulation of the green turtle was previously classified as a separate species, the black turtle, but DNA evidence indicates that it is not evolutionarily distinct from the green turtle. All species except the leatherback are in the family Cheloniidae; the leatherback belongs to the family Dermochelyidae and is its only member.
Although they have been around 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.
Sea turtles spend almost all their lives submerged but must breathe air for the oxygen needed to meet the demands of vigorous activity. With a single explosive exhalation and rapid inhalation, sea turtles can quickly replace the air in their lungs. The lungs are adapted to permit a rapid exchange of oxygen and to prevent gasses from being trapped during deep dives. The blood of sea turtles can deliver oxygen efficiently to body tissues even at the pressures encountered during diving. During routine activity green and loggerhead turtles dive for about 4 to 5 minutes and surface to breathe for 1 to 3 seconds.
Sea turtles 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. 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.
-NECK: twist, bend, side2side
-HEAD: updownJaw, side2sideTonge, updownTonge, bulgeTonge, smallerTonge, opencloseThroa
-FRONTFINS: updownFrontfins, side2sideFfins, turnFfins, bowupRFfin, bowdownRFfin, bowupLFfin, bowdownLFfin,
-BACKFINS: updownBackfins, side2sideBfins, turnBfins, bowupRBfin, bowdownRBfin, bowupLBfin, bowdownLBfin
-EYES: side2side, updown, openNick
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