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 800. In Sardinia, the numbers in 1955 were around 700, but in 1967 this had fallen to just 300. Through protection programmes, the population rose however to over 1,000 in 1980. In 2015 there were an estimated 6,000 mouflon in Sardinia. The relatively low numbers in Corsica contrast with the rest of the current range of the mouflon. Today the largest numbers live in the Czech Republic, Germany, Hungary and Austria and there are still large populations in France, Slovakia, Serbia, Croatia and Bulgaria. In the introduced populations of Central Europe it is estimated that there are over 60,000 mouflon