Crocodiles are large, semi-aquatic reptiles that belong to the Crocodilia order, along with alligators and caimans. They have a wide, powerful snout, sharp teeth, and a heavily armored body covered in tough scales. Crocodiles are found in many parts of the world, including Africa, Australia, Asia, North and South America, and are known for their strength, aggression, and ability to survive in a range of habitats, from freshwater rivers and swamps to saltwater marshes and estuaries. They are apex predators and play an important role in their ecosystems, but some species are threatened or endangered due to habitat loss, poaching, and hunting.