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".

Bactrian camels, also known as wild camels. Bactrian camels are mammals of the camel family in the order Artiodactyla. The body shape is similar to that of a domesticated Bactrian camel, but the hump is smaller, the hooves are narrower, and the ears are also smaller; The back has twin peaks and the neck is long and curved. The lower neck hair, upper outer body hair, and tail hair of the limbs are all short; The fur is sandy yellow brown, with a slightly gray snout. Bactrian camels have a very sensitive sense of smell and are tolerant of hunger and thirst. They can go without drinking water for more than 10 days or even longer. When they are extremely dehydrated, they can break down the fat inside their humps, producing water and heat. Bactrian camels are also resistant to high and cold temperatures, wind and sand, and are good at long-distance running. They can run hundreds of kilometers in a short period of time.

Bear is a general term for carnivorous animals in the family Ursidae. All types have a broad head; Maxillofacial protrusion; The skeleton is huge; The claws are thick, sharp and powerful; Covered with coarse hair on the body; The size varies depending on the type; Short and thick neck; The mouth and nose are pointed in shape; Short ears and small eyes. The lifespan of wild bears is about 15-20 years. Bears are more common in northern temperate regions and are widely distributed in North America, Europe, and Asia. Residing in mountainous, temperate, or tropical forests. Most of them are good at climbing trees and swimming Due to continuous hunting, the numbers around the world are decreasing. Nowadays, many countries protect it in national parks and require strict adherence to hunting regulations.

The spotted deer is a mammal of the deer family in the order Artiodactyla, also known as the spotted deer. Named after the white spots resembling plum blossoms in summer. The lifespan is generally about 20 years. Sika deer are distributed along the Pacific coast of Japan and Russia. In China, it is mainly distributed in mountainous areas such as Northeast China, Xiaoxing'an Mountains, Changbai Mountain, and East and South China. Group living, preferring to inhabit mountain forests or forest surroundings, often active in the early morning and dusk to forage, and resting in forests or more secluded places during the day. Due to human indiscriminate killing, the number has sharply decreased. Belonging to the first-class protected animals in China, overfishing is prohibited..