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,
Wild water buffalo International Commission on Zoological Nomenclature placed "Bubalus arnee" on the "Official List of Specific Names in Zoology", recognizing the validity of this name for a wild species. Most authors have adopted the binomen "Bubalus arnee" for the wild water buffalo as valid for the taxon. Only a few DNA sequences are available from wild water buffalo populations. Wild populations are considered to be the progenitor of modern domesticated water buffalo, but the genetic variation within "B. arnee" is unclear, and also how they are related to the domesticated river and swamp forms. Wild water buffalo The wild water buffalo ("Bubalus