A group of animals belonging to the order Artiodactyla, family Oxidae, and subfamily Oxinae, commonly known as "cattle", with a total of 5 genera. Most of them are large to extremely large herbivorous animals. This includes African buffalo and American bison, as well as yellow cattle, water buffalo, and yaks that are very important to humans. Habitats vary greatly among different species. It can survive in grasslands, savannas, wetlands, tropical rainforests, and temperate forests. Bison are highly social animals. Cattle are herbivorous animals that feed on open grassland habitats. As herbivores, they consume high fiber vegetation, which contains more cellulose and lignin than forest animals.

Pigs (Pig, Swine) are vertebrates, mammals, domestic animals, and ancient omnivorous mammals, mainly divided into domestic pigs and wild boars. Currently, people believe that pigs are the abbreviation for animals in the pig family, and pigs have different physical characteristics depending on their breed; Usually characterized by large ears, long head, short limbs, straight nose, fat body, and narrow waist and back. The hair is coarse and hard, and the fur colors are usually white, pink, black, brown, and floral. Domestic pigs are a subspecies of wild boars that have been domesticated by humans. They have shorter tusks than wild boars and are one of the domesticated livestock by humans.