Further genetic study is needed for the confirmation of proposed species under the genus Osteolaemus. The use of -y- in the scientific name Crocodylus (and forms derived from it) is a corruption introduced by Laurenti (1768).Ī total of 18 extant species have been recognized. The Modern English form crocodile was adapted directly from the Classical Latin crocodīlus in the 16th century, replacing the earlier form. A (further) corrupted form cocodrille is found in Old French and was borrowed into Middle English as cocodril(le). It is not clear whether this is a medieval corruption or derives from alternative Greco-Latin forms (late Greek corcodrillos and corcodrillion are attested). The form crocodrillus is attested in Medieval Latin. It is ascribed to Herodotus, and supposedly describes the basking habits of the Egyptian crocodile. It has been suggested, but it is not certain that the word crocodilos or crocodeilos is a compound of krokè ('pebbles'), and drilos/dreilos ('worm'), although drilos is only attested as a colloquial term for 'penis'. In the Koine Greek of Roman times, krokodilos and krokodeilos would have been pronounced identically, and either or both may be the source of the Latinized form crocodīlus used by the ancient Romans. There are several variant Greek forms of the word attested, including the later form krokódeilos ( κροκόδειλος) found cited in many English reference works. The word crocodile comes from the Ancient Greek krokódilos ( κροκόδιλος) meaning 'lizard', used in the phrase ho krokódilos tou potamoú, 'the lizard of the ( Nile) river'.

Many species are at the risk of extinction, some being classified as critically endangered. They separated from other crocodilians during the Eocene epoch, about 55 million years ago. All crocodiles are tropical species that, unlike alligators, are very sensitive to cold. They are carnivorous animals, feeding mostly on vertebrates such as fish, reptiles, birds and mammals, and sometimes on invertebrates such as molluscs and crustaceans, depending on species and age. All crocodiles are semiaquatic and tend to congregate in freshwater habitats such as rivers, lakes, wetlands and sometimes in brackish water and saltwater. However, they have many similarities in these areas as well. Ĭrocodile size, morphology, behaviour and ecology differ somewhat among species. Another trait that separates crocodiles from other crocodilians is their much higher levels of aggression. Crocodiles have more webbing on the toes of the hind feet and can better tolerate saltwater due to specialized salt glands for filtering out salt, which are present, but non-functioning, in alligators. For hard-to-distinguish specimens, the protruding tooth is the most reliable feature to define the species' family. Also, when the crocodile's mouth is closed, the large fourth tooth in the lower jaw fits into a constriction in the upper jaw. Another obvious trait is that the upper and lower jaws of the crocodiles are the same width, and the teeth in the lower jaw fall along the edge or outside the upper jaw when the mouth is closed therefore, all teeth are visible, unlike an alligator, which possesses in the upper jaw small depressions into which the lower teeth fit. The most obvious external differences are visible in the head, with crocodiles having narrower and longer heads, with a more V-shaped than a U-shaped snout compared to alligators and caimans. The gharial, with its narrow snout, is easier to distinguish, while morphological differences are more difficult to spot in crocodiles and alligators. The term crocodile is sometimes used even more loosely to include all extant members of the order Crocodilia, which includes the alligators and caimans (family Alligatoridae), the gharial and false gharial (family Gavialidae) among other extinct taxa.Īlthough they appear similar, crocodiles, alligators and the gharial belong to separate biological families.

Crocodiles ( family Crocodylidae) or true crocodiles are large semiaquatic reptiles that live throughout the tropics in Africa, Asia, the Americas and Australia.

Jaws of extinction demo