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Crocodilians are large reptiles with powerful limbs and tails and heavy plates of bone (osteoderms) beneath the skin. All crocodilian species have webbed feet, a transparent membrane drawn across the eye underwater, nostrils at the top of the snout, and other adaptations for an aquatic lifestyle. Crocodilians also have well-developed senses of smell, sight, and hearing. Of the 23 crocodilian species that exist in the world, the American crocodile and the American alligator are native to the United States. A third species, the common caiman, is an introduced species in Florida.