Flocks of migratory birds including white cranes and swans forage in the wetland of the Wuxing white crane conservation area by the Poyang Lake in Nanchang, east China's Jiangxi Province, Nov. 18. Numerous migratory birds including white cranes and swans have arrived in the wetland by the Poyang Lake, taking it as their winter habitat.Photo:Xinhua

Flocks of migratory birds including white cranes and swans forage in the wetland of the Wuxing white crane conservation area by the Poyang Lake in Nanchang, east China's Jiangxi Province, Nov. 18. Numerous migratory birds including white cranes and swans have arrived in the wetland by the Poyang Lake, taking it as their winter habitat.Photo:Xinhua

Flocks of migratory birds including white cranes and swans forage in the wetland of the Wuxing white crane conservation area by the Poyang Lake in Nanchang, east China's Jiangxi Province, Nov. 18. Numerous migratory birds including white cranes and swans have arrived in the wetland by the Poyang Lake, taking it as their winter habitat.Photo:Xinhua

Flocks of migratory birds including white cranes and swans forage in the wetland of the Wuxing white crane conservation area by the Poyang Lake in Nanchang, east China's Jiangxi Province, Nov. 18. Numerous migratory birds including white cranes and swans have arrived in the wetland by the Poyang Lake, taking it as their winter habitat.Photo:Xinhua

Flocks of migratory birds including white cranes and swans forage in the wetland of the Wuxing white crane conservation area by the Poyang Lake in Nanchang, east China's Jiangxi Province, Nov. 18. Numerous migratory birds including white cranes and swans have arrived in the wetland by the Poyang Lake, taking it as their winter habitat.Photo:Xinhua

Flocks of migratory birds including white cranes and swans forage in the wetland of the Wuxing white crane conservation area by the Poyang Lake in Nanchang, east China's Jiangxi Province, Nov. 18. Numerous migratory birds including white cranes and swans have arrived in the wetland by the Poyang Lake, taking it as their winter habitat.Photo:Xinhua

Flocks of migratory birds including white cranes and swans forage in the wetland of the Wuxing white crane conservation area by the Poyang Lake in Nanchang, east China's Jiangxi Province, Nov. 18. Numerous migratory birds including white cranes and swans have arrived in the wetland by the Poyang Lake, taking it as their winter habitat.Photo:Xinhua