Crocodiles are the largest living reptiles and the only ones that regularly venture into the sea. Two species in particular, the saltwater crocodile of Australia and Asia and the American crocodile of the Caribbean and Central America, live in estuaries, mangroves and coastal waters and can swim long distances between islands. Armoured, patient and powerful, they are ambush hunters that have changed little in 200 million years, and special glands on the tongue let them get rid of the salt they swallow with every meal.
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