![Photo taken on Dec. 18, 2018 shows black-necked cranes in Linzhou County of Lhasa, capital of southwest China\'s Tibet Autonomous Region. Thousands of black-necked cranes have arrived here to spend the winter time. (Xinhua/Purbu Zhaxi)](http://www.ecns.cn/hd/2018/12/20/ced8c069c7d44848b818b6e018cacd88.jpg)
Photo taken on Dec. 18, 2018 shows black-necked cranes in Linzhou County of Lhasa, capital of southwest China's Tibet Autonomous Region. Thousands of black-necked cranes have arrived here to spend the winter time. (Xinhua/Purbu Zhaxi)
![Photo taken on Dec. 18, 2018 shows a black-necked crane in Linzhou County of Lhasa, capital of southwest China\'s Tibet Autonomous Region. Thousands of black-necked cranes have arrived here to spend the winter time. (Xinhua/Purbu Zhaxi)](http://www.ecns.cn/hd/2018/12/20/9f9034bf6f7e47268f48bb7f0c5892b6.jpg)
Photo taken on Dec. 18, 2018 shows a black-necked crane in Linzhou County of Lhasa, capital of southwest China's Tibet Autonomous Region. Thousands of black-necked cranes have arrived here to spend the winter time. (Xinhua/Purbu Zhaxi)
![Photo taken on Dec. 18, 2018 shows black-necked cranes in Linzhou County of Lhasa, capital of southwest China\'s Tibet Autonomous Region. Thousands of black-necked cranes have arrived here to spend the winter time. (Xinhua/Purbu Zhaxi)](http://www.ecns.cn/hd/2018/12/20/a7895d822fa94a218c4faab2c1cd2cc6.jpg)
Photo taken on Dec. 18, 2018 shows black-necked cranes in Linzhou County of Lhasa, capital of southwest China's Tibet Autonomous Region. Thousands of black-necked cranes have arrived here to spend the winter time. (Xinhua/Purbu Zhaxi)
![Photo taken on Dec. 18, 2018 shows black-necked cranes in Linzhou County of Lhasa, capital of southwest China\'s Tibet Autonomous Region. Thousands of black-necked cranes have arrived here to spend the winter time. (Xinhua/Purbu Zhaxi)](http://www.ecns.cn/hd/2018/12/20/129c70e95f4e40cf898c18c44925fd25.jpg)
Photo taken on Dec. 18, 2018 shows black-necked cranes in Linzhou County of Lhasa, capital of southwest China's Tibet Autonomous Region. Thousands of black-necked cranes have arrived here to spend the winter time. (Xinhua/Purbu Zhaxi)
![Photo taken on Dec. 18, 2018 shows black-necked cranes in Linzhou County of Lhasa, capital of southwest China\'s Tibet Autonomous Region. Thousands of black-necked cranes have arrived here to spend the winter time. (Xinhua/Purbu Zhaxi)](http://www.ecns.cn/hd/2018/12/20/a35d733c0d154a8088fe4e0500fb6cd5.jpg)
Photo taken on Dec. 18, 2018 shows black-necked cranes in Linzhou County of Lhasa, capital of southwest China's Tibet Autonomous Region. Thousands of black-necked cranes have arrived here to spend the winter time. (Xinhua/Purbu Zhaxi)
![Photo taken on Dec. 18, 2018 shows black-necked cranes in Linzhou County of Lhasa, capital of southwest China\'s Tibet Autonomous Region. Thousands of black-necked cranes have arrived here to spend the winter time. (Xinhua/Purbu Zhaxi)](http://www.ecns.cn/hd/2018/12/20/4f9df6fd2b2040378de48c5a9731aca7.jpg)
Photo taken on Dec. 18, 2018 shows black-necked cranes in Linzhou County of Lhasa, capital of southwest China's Tibet Autonomous Region. Thousands of black-necked cranes have arrived here to spend the winter time. (Xinhua/Purbu Zhaxi)
![Photo taken on Dec. 18, 2018 shows black-necked cranes in Linzhou County of Lhasa, capital of southwest China\'s Tibet Autonomous Region. Thousands of black-necked cranes have arrived here to spend the winter time. (Xinhua/Purbu Zhaxi)](http://www.ecns.cn/hd/2018/12/20/f0250910cc194096bcd92647c06b88d7.jpg)
Photo taken on Dec. 18, 2018 shows black-necked cranes in Linzhou County of Lhasa, capital of southwest China's Tibet Autonomous Region. Thousands of black-necked cranes have arrived here to spend the winter time. (Xinhua/Purbu Zhaxi)
![Photo taken on Dec. 18, 2018 shows black-necked cranes in Linzhou County of Lhasa, capital of southwest China\'s Tibet Autonomous Region. Thousands of black-necked cranes have arrived here to spend the winter time. (Xinhua/Purbu Zhaxi)](http://www.ecns.cn/hd/2018/12/20/de6a1199eb054c8fa2b9fa5bc48550ba.jpg)
Photo taken on Dec. 18, 2018 shows black-necked cranes in Linzhou County of Lhasa, capital of southwest China's Tibet Autonomous Region. Thousands of black-necked cranes have arrived here to spend the winter time. (Xinhua/Purbu Zhaxi)
![Photo taken on Dec. 18, 2018 shows black-necked cranes in Linzhou County of Lhasa, capital of southwest China\'s Tibet Autonomous Region. Thousands of black-necked cranes have arrived here to spend the winter time. (Xinhua/Purbu Zhaxi)](http://www.ecns.cn/hd/2018/12/20/76b18693da1e474fb3933bced52c6509.jpg)
Photo taken on Dec. 18, 2018 shows black-necked cranes in Linzhou County of Lhasa, capital of southwest China's Tibet Autonomous Region. Thousands of black-necked cranes have arrived here to spend the winter time. (Xinhua/Purbu Zhaxi)