Clumsy object that it is, the shell has helped ensure the survival of the turtles for 175 million years. Today it is still worn by all species, although it has been modified to suit a variety of environments. Sea turtles, for example, have jettisoned much of their shell bone and are among the fastest-moving of modern reptiles. Land turtles have thinned theirs down to make tiptoe locomotion on their elephantine feet less ponderous. Soft-shelled turtles, which live in fresh water, have developed pancake-shaped shells with flexible edges which they use to help bury themselves. Lying hidden in shallow water, waiting for prey, they occasionally crane their long necks to breathe air with their snorkel-like nostrils.
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