It is a type of mammal that lives around the world and belongs to the deer family. They are known for their majestic physique, strong limbs, and spectacular antlers unique to males. They usually live in forests, grasslands, and swamps, with plants as their staple food, including grass, leaves, fruits, and bark. Antlers shed and regrow every year, which is a significant sign of their sexual maturity. Bucks compete for mates during the breeding season through the collision of antlers, which is part of their survival competition. In addition, male deer are also important species in many ecosystems, playing a crucial role in maintaining biodiversity and ecological balance.

The red deer is a mammal belonging to the deer family and the deer genus. It is a large deer species second only to the moose, with a total of 8 subspecies. It is named after its body shape resembling a galloping horse. Body length is about 180 centimeters, shoulder height is 110-130 centimeters, adult male weighs about 200 kilograms, and female weighs about 150 kilograms. Due to different origins, there are also some differences in the morphology of deer. The body is dark brown with some white spots on the back and sides. Males have horns, usually divided into 6 forks, with a maximum of 8 forks, and the second fork of the furry horn is closely adjacent to the eyebrow fork. Summer fur is relatively short, without fuzz, generally reddish brown in color, with a darker back and a lighter belly, hence it is called "red deer".

Reindeer, belonging to the family Reindeer in the order Artiodactyla, are animals of the genus Reindeer. Reindeer have a large body shape, with thick and dense coarse fur all over their body. Their head is long and straight, their mouth is thick, their eyes are large, their neck is thick and short, their nostrils are large, they do not have a nose mirror, their nostrils have short fur, their tail is short, and their hooves are wide. Females have smaller horns than males. Reindeer have features such as horse heads, antlers, donkey bodies, and cow hooves, and are commonly known as "four unlike". Reindeer are widely distributed in the cold regions of northern Eurasia, North America, and southern Siberia, generally inhabiting coniferous forests in cold temperate zones. Every year, reindeer undergo a large-scale migration of several hundred kilometers, with female deer leading the entire migration team and male deer following closely behind.

White tailed deer is an animal belonging to the subfamily of hollow toothed deer and the genus of hollow toothed deer. The white tailed deer has a wide white tail, with a slightly reddish brown fur in summer and a slightly gray brown fur in winter. White tailed deer have strong adaptability and are distributed in most parts of North America, northern South America, and Africa. They mainly live in forests, swamps, tundra, and even deserts. White tailed deer are also common in the United States, usually living alone or in groups of one male deer and two or three female deer.

White tailed deer is an animal belonging to the subfamily of hollow toothed deer and the genus of hollow toothed deer. The white tailed deer has a wide white tail, with a slightly reddish brown fur in summer and a slightly gray brown fur in winter. An adult white tailed deer has antlers, which extend forward on the main trunk and grow upward on the forked branch. The horns of the white tailed deer do not split, and its broad brown tail is covered with a patch of white fur. When the white tailed deer encounters a danger warning and rushes forward, its tail lifts upward, revealing its white color. It is said to have the effect of confusing pursuers, and the name of the white tailed deer comes from this.