Crocodiles are reptiles of the order of crocodilians (which actually includes, the alligators, caimans and also the Gharial). Crocodiles are generally traced back to the Cretaceous and also the Triassic period. Crocodilians, normally, are animals of elongated body and tail, long muzzle through which they will show several sharp and conical teeth (typically 28 to 32 teeth within the upper jaw in addition to 30 to 40 teeth in lower jaw). In crocodiles, the muzzle is narrow in the end, with the 4th tooth on each side of the lower jaw visible whenever the mouth closes.
All Crocodiles are tipically semi-aquatic animals (they spend a lot of time in water, but in addition will need to go to shore) who, depending on the species, can be found in rivers, estuaries, coastal areas as well as in the open sea . They swim, usually on the surface with eyes as well as nostrils along the water line and boost their body with the help of the strong tail.
All Crocodiles are carnivores, and among them, are big predators like the Nile Crocodile as well as the Saltwater crocodile. The Saltwater crocodile is definitely the biggest reptile in existence, because it can reach seven meters in length and more than one tonne (1000 kg) in weight. There are however smaller crocodile species like the Dwarf crocodile, like its name implies.
As hatchlings they feed on small victim (insects, fish, frogs), but as they grow they start to hunt prey constantly larger, up until the size of a large antelope.
Like various other reptiles, crocodiles actually are cold-blooded animals, their body temperature will change together with the temperature of the environment) and, as a result, they need to bask in the sun, to increase the temperature of the entire body. If it is too hot, they would prefer water or shade when accessible.
Crocodilians are oviparous (they will reproduce using eggs that are deposited outside the mother) and are the only reptiles which exhibit actual parental care. Therefore, most of the crocodiles construct nests, using plenty of dirt or plant rubble, the remainder species of crocodiles dig burrows on the sand banks of rivers or beaches. Females, usually, and occasionally the male remains nearby to defend eggs against predators.
Prior to the hatching, the youngs emit vocalizations (noises), to which the mother responds to simply by scooping the top of the nest to help out the eggs after which it occasionally holding the newborn in her mouth and takes them to the water, protecting them subsequently sometimes for weeks or months. Upon birth the offspring will measure only approximately twenty cm.
Mankind is the most important enemy of crocodiles due to their hunt for the leather trade in addition to the devastation of their habitat.