For centuries the nomadic Tsaatan people have roamed the taiga of northern Mongolia, raising the reindeer that provide their livelihood.
But untreated disease and inbreeding now threaten the reindeer herds, and today the future of the Tsaatan's 3,000-year-old culture is uncertain Veterinarians have determined that Mongolia's domesticated reindeer population has fallen to 667 animals. The decline continues a decades-long trend. In 1990 there were more than a thousand reindeer. In 1977 the herd exceeded 2,000 animals.
(source: National Geographic.com)