An American crocodile, Crocodylus acutus, resting on a bed of seagrass. These medium-sized crocodiles live in freshwater and saltwater habitats of Central America, the northern coasts of South America, the Caribbean Islands, and the southern tip of Florida. They're most commonly found in mangrove-lined estuaries and saltwater lagoons. American crocodiles are listed as "Vulnerable" by the IUCN.