History of the domestic sheep exact line of descent between domestic sheep and their wild ancestors is unclear. The most common hypothesis states that "Ovis aries" is descended from the Asiatic ("O. orientalis") species of mouflon. A few breeds of sheep, such as the Castlemilk Moorit from Scotland, were formed through crossbreeding with wild European mouflon. The urial ("O. vignei") was once thought to have been a forebear of domestic sheep, as they occasionally interbreed with mouflon in the Iranian part of their range. However, the urial, argali ("O. ammon"), and snow sheep ("O. nivicola") have a different number of chromosomes than other Ovis species,
European mouflon view may be restricted by the position of the horn tip. As a result, rams begin to wear down these horns. Their binocular vision is limited to a relatively small facial arc of 60 percent; only in this area can they see any depth of field; in the rest of their visual arc, mouflon can mainly just perceive movement. If mouflon are disturbed by a movement in their lateral field of vision, they turn their head toward the object, thereby locating it within the depth of the landscape. Only then do they try to gain additional information by testing the