Living in salty ocean water is not easy and many marine organisms have special adaptations in order to survive in the excessive salt of their environment. The seven sea turtle species are part of a group of about 100 living marine reptile species in the world. In females, the hind flippers have another purpose as well-they are used to dig an egg chamber in the sand when they come ashore to nest. The large and strong front flippers act like paddles to propel them through the water, while the smaller back flippers function as rudders to help them steer. To help them efficiently power their bodies through water, sea turtles have long flippers instead of the webbed feet of their freshwater counterparts. ![]() Usually, they cruise at around 0.9 to 5.8 mph (1.4 to 9.3 km/h), but have been found to swim up to 22 mph (35 km/hr) when frightened. Sea turtles are generally not extremely fast swimmers. Their streamline shell and flippers make them hydrodynamic swimmers. Sea turtles are adapted for a life at sea.
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