The mountain sheep (species Ovis ammon) is the globally endangered wild sheep, which roams the highlands of Central Asia (Himalaya, Tibet, Altay). It is also the biggest wild sheep, standing as high as 120 cm and weighing as much as 140 kg. The Pamir argali (also called Marco Polo sheep, for they were first described by that traveller) may attain more than 6 feet in length.