Crocodilians are a group of reptiles that includes crocodiles, alligators, caimans, and gharials. They are known for their long bodies, powerful jaws, and tough, scaly skin. These animals are primarily found in tropical and subtropical regions, often inhabiting freshwater environments like rivers, lakes, and swamps. Crocodilians are carnivorous and are skilled hunters, using their strong sense of sight and hearing to catch prey. They are also ectothermic, meaning they rely on external temperatures to regulate their body heat. These reptiles play an important role in their ecosystems by helping to control fish and other animal populations.