The black-necked cranes, a species under first-class state protection in China, stop by and forage at the A Rag Wetland in Damxung County during their returning journey to the north every spring.

The wildlife conservators of the county are the busiest during this period. Nyima Dondrup, one of the local wildlife conservators, has been guarding the black-necked cranes at the wetland for 15 years.

"I find my efforts valuable when I watch the black-necked cranes flying," said Nyima Dondrup.