The dromedary's karyotype is similar to that of the Bactrian camel. He also described what was then considered to be a wild population of Bactrian camel. Asian species include the Amur tiger and Bactrian camel. The hair of the Bactrian camel is also used for more luxurious clothing. The Bactrian camel belongs to the family Camelidae. It is closely related to the Bactrian camel ("Camelus bactrianus"). Domestication of the Bactrian camel and use of the horse for transport then followed. The valley is also the natural home of the double-humped Bactrian camel. The dromedary and the Bactrian camel often interbreed to produce fertile offspring. The Wild Bactrian camel is a separate species and is now critically endangered. The Bactrian camel and the dromedary often interbreed to produce fertile offspring. The wild Bactrian camel has been classified as Critically Endangered since 2002. A thirsty Bactrian camel can drink 135 liters (30 gallons) in only 13 minutes.