Pig is a vertebrate, mammal, domestic animal, and also an ancient omnivorous mammal, 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. Generally speaking, domestic pigs refer to pig breeds that humans raise for food.