Why do horses sleep standing up? They do this primarily to protect their own security. Before being domesticated by humans, (wild) horses lived in desert and steppe areas. In nature, they have many natural enemies, such as jackals and wolves, and their only way to avoid danger is to run. However, most of the "natural enemies" of horses are nocturnal animals, so in order to avoid danger in time, they have to stand and nap during the day and sleep at night to maintain a high degree of vigilance, and once there is danger, they can quickly dodge. In addition, in order to ensure their own safety, horses have also made changes in their physical evolution. Of the mammals on land, horse eyes are the largest. Because of its big eyes, the horse's field of view can reach 350 degrees. It can be said that except for the back of the head, the horse can see everything around it. This enhances the ability to spot enemies!
