Crocodile (subfamily Crocodylinae) crocodiles are large semiiaquatic or amfibi reptiles that live throughout the tropics throughout the world. Crocodylinae, whose members are considered true crocodiles, are classified as biological subfamilies. A broader definition of crocodile, which includes Tomistoma. All crocodiles are semiquatic and tend to gather in freshwater habitats such as rivers, lakes, and sometimes in brackish water and salt water. They are carnivorous animals, eating mostly in vertebrates such as fish, reptiles, birds and mammals, and sometimes in invertebrates such as mollusks and crustaceans, depending on species and age. All crocodiles are tropical species, are very sensitive to cold. They separated from other crocodiles during the Eocene era, around 55 million years ago. Many species are threatened with extinction, some are classified as highly endangered. The word "crocodile" comes from the Ancient G...