![Photo taken on Nov. 14, 2018 shows a gull at Duchang wetland of Poyang Lake, east China\'s Jiangxi Province. The Poyang Lake, China\'s largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)](http://www.ecns.cn/hd/2018/11/16/3b5db91263ab41bcaf96a347bcf50b1b.jpg)
Photo taken on Nov. 14, 2018 shows a gull at Duchang wetland of Poyang Lake, east China's Jiangxi Province. The Poyang Lake, China's largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)
![Photo taken on Nov. 14, 2018 shows the migrant birds at Duchang wetland of Poyang Lake, east China\'s Jiangxi Province. The Poyang Lake, China\'s largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)](http://www.ecns.cn/hd/2018/11/16/49c94bf407174d37b34d16eafd26c349.jpg)
Photo taken on Nov. 14, 2018 shows the migrant birds at Duchang wetland of Poyang Lake, east China's Jiangxi Province. The Poyang Lake, China's largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)
![Grey cranes are seen at Duchang wetland of Poyang Lake, east China\'s Jiangxi Province, Nov. 14, 2018. The Poyang Lake, China\'s largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)](http://www.ecns.cn/hd/2018/11/16/5036f6f211a2414e9db8b64fdc1bc2c9.jpg)
Grey cranes are seen at Duchang wetland of Poyang Lake, east China's Jiangxi Province, Nov. 14, 2018. The Poyang Lake, China's largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)
![Photo taken on Nov. 9, 2018 shows migrant birds at Duchang wetland of Poyang Lake, east China\'s Jiangxi Province. The Poyang Lake, China\'s largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)](http://www.ecns.cn/hd/2018/11/16/7a45b3e0b5234f0ba113129c54de9670.jpg)
Photo taken on Nov. 9, 2018 shows migrant birds at Duchang wetland of Poyang Lake, east China's Jiangxi Province. The Poyang Lake, China's largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)
![Migrant birds are seen at Duchang wetland of Poyang Lake, east China\'s Jiangxi Province, Nov. 14, 2018. The Poyang Lake, China\'s largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)](http://www.ecns.cn/hd/2018/11/16/445d1d7928ae4c8aa80665c973490c32.jpg)
Migrant birds are seen at Duchang wetland of Poyang Lake, east China's Jiangxi Province, Nov. 14, 2018. The Poyang Lake, China's largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)
![Aerial photo taken on Nov. 9, 2018 shows migrant birds at Duchang wetland of Poyang Lake, east China\'s Jiangxi Province. The Poyang Lake, China\'s largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)](http://www.ecns.cn/hd/2018/11/16/24ffbe2e60ce4b369fea26b8eab71be2.jpg)
Aerial photo taken on Nov. 9, 2018 shows migrant birds at Duchang wetland of Poyang Lake, east China's Jiangxi Province. The Poyang Lake, China's largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)
![Grey cranes are seen at Duchang wetland of Poyang Lake, east China\'s Jiangxi Province, Nov. 14, 2018. The Poyang Lake, China\'s largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)](http://www.ecns.cn/hd/2018/11/16/87fb39d10bda4a50bf8c09b968228713.jpg)
Grey cranes are seen at Duchang wetland of Poyang Lake, east China's Jiangxi Province, Nov. 14, 2018. The Poyang Lake, China's largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)
![Grey cranes are seen at Duchang wetland of Poyang Lake, east China\'s Jiangxi Province, Nov. 14, 2018. The Poyang Lake, China\'s largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)](http://www.ecns.cn/hd/2018/11/16/5dd4a49c49e04efb8a3aa77d1a37dafc.jpg)
Grey cranes are seen at Duchang wetland of Poyang Lake, east China's Jiangxi Province, Nov. 14, 2018. The Poyang Lake, China's largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)
![Aerial photo taken on Nov. 9, 2018 shows grey cranes at Duchang wetland of Poyang Lake, east China\'s Jiangxi Province. The Poyang Lake, China\'s largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)](http://www.ecns.cn/hd/2018/11/16/684fbc447806447aaa1a5bfa1c08ac67.jpg)
Aerial photo taken on Nov. 9, 2018 shows grey cranes at Duchang wetland of Poyang Lake, east China's Jiangxi Province. The Poyang Lake, China's largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)
![Aerial photo taken on Nov. 9, 2018 shows migrant birds at Duchang wetland of Poyang Lake, east China\'s Jiangxi Province. The Poyang Lake, China\'s largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)](http://www.ecns.cn/hd/2018/11/16/f88d373466ba475da2d4f0d2ca1d1e28.jpg)
Aerial photo taken on Nov. 9, 2018 shows migrant birds at Duchang wetland of Poyang Lake, east China's Jiangxi Province. The Poyang Lake, China's largest freshwater lake, saw a flock of migratory birds overwintering in it. (Xinhua/Fu Jianbin)