The Bactrian camel (Camelus bactrianus) is a large, even-toed ungulate native to the steppes of Central Asia. Of the two species of camels, it is by far the rarer. The Bactrian camel has two humps on its back, in contrast to the single-humped dromedary camel. Its population of two million exists mainly in the domesticated form. Some authorities, notably the International Union for Conservation of Nature (IUCN), use the binomial name Camelus ferus for the wild Bactrian camel and reserve Camelus bactrianus for the domesticated Bactrian camel. Their name comes from the ancient historical region of Bactria.