Information All turtles and tortoises have a shell which is built into the skeleton. Much of the backbone is fused to the inner boney layer of the shell, which in many species, has enough room for the animal to pull its head inside for protection from predators. The shell also prevents moisture loss and absorbs heat to warm these cold-blooded animals. A female lays her eggs in a nest, covers them up, and leaves the eggs to incubate on their own. The eggs develop at a temperature determined by the surrounding sand and soil of their nest. Temperature variations determine the sex of the incubating eggs. Lower temperatures produce males, higher temperatures produce females.

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