The domesticated Bactrian camel has served as a pack animal in inner Asia since ancient times. With its tolerance for cold, drought, and high altitudes, it enabled travel such as the caravans of the Silk Road. The wild form has dwindled to a population estimated at 800 in October 2002 and has been classified as critically endangered on the red List of Threatened Species. Its range in the wild is restricted to remote regions of the Gobi and Taklamakan Deserts of Mongolia and China, migrating from the desert to rivers in Siberia during winter. A small number of wild Bactrian camels still roam the Mangystau Province of southwest Kazakhstan and the Kashmir valley in Pakistan and India. There are feral herds of Bactrian camels in Australia.