The demand for their pelts also puts the chiru in danger of being hunted to extinction.

NPR: Chang Tang's Endangered Antelope

Ridgeway set up a team of four men who would try to find and follow the migration route of the chiru more than 200 miles across the remote Chang Tang Plateau.

NPR: Chang Tang's Endangered Antelope

There was some doubt as to whether the team would be able to locate a migrating herd of pregnant females, but one week into the search, they stumbled upon 70 to 80 chiru grazing in a valley below their camp.

NPR: Chang Tang's Endangered Antelope