Sika deer (scientific name: Cervus nippon) belongs to the genus Cervidae, with a body length of 140-170cm, a shoulder height of 85-100cm, a tail length of 12-13cm, and a weight of 100-150kg. Males have horns, while females have no horns. The horns of stags are usually divided into 3-4 forks. The sika deer has large, erect ears, slender limbs, a well-proportioned trunk, and a short tail. The fur is red, with multiple rows of irregular white spots along the sides of the spine, the lower jaw is white, the nasal surface and cheeks are sandy yellow, the back of the tail is dark brown, the lower part of the tail and the groin are white, and the abdominal hair is pale brown.

Red deer, a species of deer in the family Deer. Red deer were widely distributed in many parts of the world, originally found in Asia, Europe, and North America, and later introduced to New Zealand. Red deer usually live separately for both sexes and only gather together during the mating season. At this point, the male deer engages in intense combat with the female deer in order to mate. Red deer living in the forest have long been the best prey for humans, with the purpose of not only consuming their delicious meat, but also widely regarded as a great form of entertainment and exercise. Many subspecies of red deer are now at risk of extinction. This includes North African red deer, Kashmir red deer, and Corsican red deer.

Deer is the only deer species in the family Deer and genus Deer. Because its head and face are long and narrow like a horse, its horns are slightly different from other deer, its hooves are wide like cows, and its tail is slender like a donkey, it is also known as the Four Elephant. Its horn shape is unique, opposite to the horns of other deer. The front branch splits into smaller branches, while the back branch hardly splits. The head has a long and narrow snout, the exposed part of the nose is wide, the eyes are small, and the infraorbital glands are very prominent. The limbs are thick and the main hooves are broad and fleshy, with well-developed hanging hooves and a loud knocking sound when walking. Deer prefer swamp and wetland habitats, feeding on green grass and aquatic plants. Good at socializing, good at swimming, and enjoys eating tender grass and aquatic plants.

The Canadian red deer is a designated subspecies of the large animal red deer in the ungulates and artiodactyls order. The male deer has large antlers that begin to grow in spring and shed each winter. Their fur varies in color depending on the season and the type of habitat. In winter, the fur color is generally gray or other lighter colors, while in summer, the color is reddish and darker. Residing in forests and forest edges. During estrus, male deer will perform various actions to compete for mating rights, including posing, antler wrestling, and vocalizing. The male deer will continuously make sharp calls to ensure its dominant position and attract the female deer.

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..