Photo taken on May 12, 2018 shows a black vulture in Damxung County, southwest China's Tibet Autonomous Region. (Xinhua/Chogo)

Photo taken on May 12, 2018 shows black vultures fighting for food in Damxung County, southwest China's Tibet Autonomous Region. (Xinhua/Chogo)

Photo taken on May 12, 2018 shows black vultures in Damxung County, southwest China's Tibet Autonomous Region. (Xinhua/Chogo)

Photo taken on May 12, 2018 shows black vultures in Damxung County, southwest China's Tibet Autonomous Region. (Xinhua/Chogo)