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 through their nostrils. Often, the warning call is preceded by a nervous stomping of the front feet. The warning call is quiet when a mouflon is only slightly disturbed, but becomes much louder as danger threatens. A herd whose leader makes this sound, flees immediately. If the sound is made by another animal in the herd, the rest begin to take defensive action, but continue to wait for the reaction of the leader.. Rams make a rattling and snarling sound when chasing rutting ewes. The clashing of horns is one of the most familiar sounds of the mouflon. It is