You may have seen some videos of large chicken farms online. Chickens are kept in narrow cages. The chicken farms are still dark and dark everywhere. Why should chicken farms create such unnatural living conditions for chickens? It is true that there is a cruel rule of pecking order in the world of chickens. The high pecking order represents the high status, and the chickens with high pecking order can eat first and bully the chickens with low status. The other habit of chickens is that after seeing the chickens who are bullied to the chickens with hair and bald bleeding, the other chickens not only do not help the weak, but meet with the blood to go away and enter the mode of killing hegemony. In short, the despised chain inside all kinds of white cut chicken and spicy chicken is really bloody. The researchers only understand some of the reasons for the chicken’s frailty. If there are many chickens, in order to ensure their position, the chickens will fight frequently and cause casualties. This is why we see some large farms with bald chickens with some hair pecked out. Sometimes, the lack of methionine can lead to pecking of the same kind. Methionine is an essential amino acid for chickens, and cannot be synthesized by the body, and it must be taken through food. Because the feathers of birds contain sulfur methionine, the chickens without sulfur will peck at the feathers of other chickens, which leads to similar food. In addition, chickens have a gland called licking gland. If food is short of salt, the secretion of licking glands is not salty and tasteless, and the chicken will peck the other chickens’ licking glands to supplement the salt. It is not surprising that the bullied hens are often the favorite ones because when the rooster and the hen give birth to the chickens, they often catch the hen bald. Bald chicken let other hens think she is good bullying, so they will be bullied by the group. To prevent the cock from being bald, sometimes the chicken farm will wear a similar small vest to the pet chicken. Because the beak neurons of poultry are densely distributed, they are sensitive, and they will feel pain when they peck at others after pruning, and violence will decrease. Of course, this method is cruel and has been criticized. About a decade ago, McDonald’s chicken farm was controversial about the video of breaking the beak of its chickens. The chickens have good color discrimination ability, and they can see which chicken has bleeding and injured. In 1903, there was a man called Andrew Jackson Jr. According to this characteristic of chicken, the person applied for the patent of chicken glasses. In the early 20th century, the chicken farm began to wear colored glasses for chickens. In the 1950s, the national farm equipment company of Brooklyn, the American company that produces eye for chickens, could sell millions of pairs of eyes a year. From this data, we can feel the frequency of chicken killing each other and the popularity of chicken glasses. This is the 1947 national band and tag company’s chicken glasses advertisement. The slogan is: “the life-saving hen glasses. The girls opened up a new world. ” Robert L, President of the American Society for the history of poultry (aphs). Hogue said that in addition to chicken glasses, some people have invented contact lenses for chickens, but they can make the eyes uncomfortable and therefore less popular. It is often necessary to insert the glasses in the nostril of the chicken because of the need to wear glasses for chickens. For the sake of animal welfare, this operation was banned in some developed countries, such as the UK. But online can still buy this kind of chicken glasses, small chicken owners buy to wear for the chicken bully, to prevent it from making the wrong chicken. Phillip J, an animal researcher at Pennsylvania State University. Clauer said that in order to prevent the strong light induced mutual killing, the chicken farm generally does not need to use more than 40 watt bulbs; if the chickens are raised for more than 12 weeks, the number of bulb tiles will be reduced to 15-25 watts, and only hanging in the feeding place; in order to further reduce the possibility of blood riot in the chickens, some chicken farms simply use red light bulbs or window glass.