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".

Elephants are mammals in the family Elephantidae, belonging to two genera, and are the largest terrestrial animals in the world. Its pillar like limbs and wide feet can stably support its massive body. Elephants are very intelligent, highly social, and good at learning, so they are often domesticated by humans. Elephants have been listed as one of the top ten species most threatened by trade activities in the world. In order to protect endangered elephants, countries such as Kenya have called for a 20-year ban on ivory trade, curb illegal ivory trade, punish poaching, and prevent elephant extinction.