Late every March, black-necked cranes that winter in the Yarlung Tsangpo River Valley fly to Shanza to nest, lay eggs and hatch their young. Around November, as the grasslands enter winter on the plateau, the cranes fly to warmer southern regions.

From March to November is Kyizom's busiest time. She is responsible for recording the number of the wild animals, especially the migration patterns of black-necked cranes, and preventing human activities that may harm their habitats.

"During the breeding season, they are more vulnerable and in need of my protection," she said. "Seeing the hatching of black-necked crane chicks makes me both happy and fearful because I worry wild dogs and foxes may eat them. Therefore, I increase the frequency of my patrols.

"The survival status and migration patterns of black-necked cranes reflect changes in the highland wetland ecology, serving as a pointer for the health of highland wetlands," she said.

In recent years, Xizang has increased efforts to protect their habitats, and the scattered wetlands in Shanza have attracted a large number of black-necked cranes for breeding and raising their young.