![Black-necked cranes fly over the in Doqen Co (Lake) Yadong County, southwest China\'s Tibet Autonomous Region, May 29, 2019. (Xinhua/Zhang Rufeng)](http://www.ecns.cn/hd/2019/05/31/0158b1a415684f559d1a5c4e75d56266.jpg)
Black-necked cranes fly over the in Doqen Co (Lake) Yadong County, southwest China's Tibet Autonomous Region, May 29, 2019. (Xinhua/Zhang Rufeng)
![Black-necked cranes rest on the Doqen Co (Lake) in Yadong County, southwest China\'s Tibet Autonomous Region, May 29, 2019. (Xinhua/Zhang Rufeng)](http://www.ecns.cn/hd/2019/05/31/a9de0f0c52ef47c4bce181ae80f22c6d.jpg)
Black-necked cranes rest on the Doqen Co (Lake) in Yadong County, southwest China's Tibet Autonomous Region, May 29, 2019. (Xinhua/Zhang Rufeng)
![Black-necked cranes forage on the Doqen Co (Lake) in Yadong County, southwest China\'s Tibet Autonomous Region, May 29, 2019. (Xinhua/Zhang Rufeng)](http://www.ecns.cn/hd/2019/05/31/03d4c13caac74737b1e94c5fba8cf38c.jpg)
Black-necked cranes forage on the Doqen Co (Lake) in Yadong County, southwest China's Tibet Autonomous Region, May 29, 2019. (Xinhua/Zhang Rufeng)
![Black-necked cranes rest on the Doqen Co (Lake) in Yadong County, southwest China\'s Tibet Autonomous Region, May 29, 2019. (Xinhua/Zhang Rufeng)](http://www.ecns.cn/hd/2019/05/31/f89555e8f98749979c405b598338fa7e.jpg)
Black-necked cranes rest on the Doqen Co (Lake) in Yadong County, southwest China's Tibet Autonomous Region, May 29, 2019. (Xinhua/Zhang Rufeng)