Crocodiles are reptiles belonging to the Crocodylidae and Alligatoridae families, with a total of 8 genera and 23 species. Crocodiles have a longer torso; Muscular development; Crocodiles are mostly distributed in tropical regions of Africa, Asia, North and South America, and Australia, with only Yangtze alligators and American alligators living in temperate regions. Crocodiles inhabit areas such as lakes, swamps, and shallow waters. Living together in common groups; Enjoy a warm environment. Crocodiles mainly prey on vertebrates, as well as mollusks and crustaceans. Crocodiles, as one of the oldest species on Earth to date, retain many features of early dinosaur reptiles and are also known as "living fossils".