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".

It is a mammal of the platypus genus in the platypus family. The platypus is named after its snout that resembles a duck's beak. It is a mammal of the platypus genus in the platypus family. The platypus is named after its snout that resembles a duck's beak. It is a mammal of the platypus genus in the platypus family. The platypus is named after its snout that resembles a duck's beak. Mainly foraging underwater, preying on invertebrates such as worms, insect larvae, freshwater shrimp, and crayfish. The platypus holds an important position in Australian culture and often appears in mythological stories, songs, poems, or stamps. At the beginning of the 20th century, humans were still hunting platypus for fur. Except for the extinction of populations in southern Australia, platypus were still common in their distribution areas