LHUNZHUB, Feb. 1 (Xinhua) -- This aerial drone video shows view of black-necked cranes at a reservoir in Lhunzhub County of Lhasa, southwest China's Xizang Autonomous Region. Lhunzhub County is one of the main habitats for black-necked cranes to spend winter. The black-necked crane, a species under first-class state protection in China, mainly inhabits plateau meadows and marshes at an altitude of 2,500 to 5,000 meters.