Mouflon the "Systema Naturæ", Linnaeus and Gmelin treated the mouflon and argali as one species. Von Schreiber used the combination "Ovis aries musimon" as early as 1782. In 1792, Robert Kerr listed the "Corsican argali" as a separate variety of argali ("Ovis Ammon europaea"), writing I have introduced this variety on the authority of Mr Pennant, who distinguishes between the Argali of Corsica and the Siberian, though the difference seems chiefly in colour ; one specimen brought from that island by the famous Paoli, differed from the above in colour, having a large white spot on the front of the neck,
Wild horse stock from which domesticated horses are descended. The horse family Equidae and the genus "Equus" evolved in North America, before the species moved into the Eastern Hemisphere. Studies using ancient DNA, as well as DNA of recent individuals, show the presence of two closely related horse species in North America, the wild horse and "Haringtonhippus francisci", the "New World stilt-legged horse"; the latter has been taxonomically assigned to various names. Currently, three subspecies that lived during recorded human history are recognized. One subspecies is the widespread domestic horse ("Equus ferus caballus"), as well as two wild subspecies: the recently extinct