Conducting a census of the wildlife is a test for eyesight. And the trick to finding a Przewalski's gazelle from the vast grassland is to look for its white butt cheeks.

Przewalski's gazelle was first found in 1875 when the species was widespread across China's Xinjiang, Gansu, Ningxia, Inner Mongolia, and Qinghai. Until the 1950s, the animal was wiped out in other provinces, only a few survived around Qinghai Lake.

After years of conservation, the species' population has seen an increase. Check the video to learn more.

About 'Yes! Sir'

Until 2018, China has more than 2,700 nature reserves in which countless protection stations have been settled. And now, China has made major strides in building national parks to protect the environment as well as the biodiversity. "Yes! Sir" is a new series by CGTN Nature. We visit those protection stations and learn about the stories of those working on the front line of nature conservation.

(Cover image designed by Yu Peng, video filmed and edited by Xing Fangyu, Yue Feng, Gao Xin and Ban Jinting)

(If you want to contribute and have specific expertise, please contact us at nature@cgtn.com.)