Photo shows a few whooper swans flying above the Qinghai Lake in winter, northwest China's Qinghai Province. Renowned as one of the world's key wetlands and state-level natural reserves in China, the Qinghai Lake is located on the Qinghai-Tibet Plateau, 4,500 meters above the sea level. It is well-known as a paradise for wild animals including various birds. Bar-headed geese, gulls and cormorants nest and breed here in summer, while migrant birds including whooper swans spend winter on the lake, which forms a fascinating scenery in winter. [Photo/Xinhua]

Photo shows a few whooper swans flying above the Qinghai Lake in winter, northwest China's Qinghai Province. Renowned as one of the world's key wetlands and state-level natural reserves in China, the Qinghai Lake is located on the Qinghai-Tibet Plateau, 4,500 meters above the sea level. It is well-known as a paradise for wild animals including various birds. Bar-headed geese, gulls and cormorants nest and breed here in summer, while migrant birds including whooper swans spend winter on the lake, which forms a fascinating scenery in winter. [Photo/Xinhua] 

Photo shows a few whooper swans on the Qinghai Lake in winter, northwest China's Qinghai Province. Renowned as one of the world's key wetlands and state-level natural reserves in China, the Qinghai Lake is located on the Qinghai-Tibet Plateau, 4,500 meters above the sea level. It is well-known as a paradise for wild animals including various birds. Bar-headed geese, gulls and cormorants nest and breed here in summer, while migrant birds including whooper swans spend winter on the lake, which forms a fascinating scenery in winter. [Photo/Xinhua] 

Photo shows a few whooper swans on the Qinghai Lake in winter, northwest China's Qinghai Province. Renowned as one of the world's key wetlands and state-level natural reserves in China, the Qinghai Lake is located on the Qinghai-Tibet Plateau, 4,500 meters above the sea level. It is well-known as a paradise for wild animals including various birds. Bar-headed geese, gulls and cormorants nest and breed here in summer, while migrant birds including whooper swans spend winter on the lake, which forms a fascinating scenery in winter. [Photo/Xinhua] 

Photo shows a few whooper swans on the Qinghai Lake in winter, northwest China's Qinghai Province. Renowned as one of the world's key wetlands and state-level natural reserves in China, the Qinghai Lake is located on the Qinghai-Tibet Plateau, 4,500 meters above the sea level. It is well-known as a paradise for wild animals including various birds. Bar-headed geese, gulls and cormorants nest and breed here in summer, while migrant birds including whooper swans spend winter on the lake, which forms a fascinating scenery in winter. [Photo/Xinhua] 

Photo shows a few whooper swans on the Qinghai Lake in winter, northwest China's Qinghai Province. Renowned as one of the world's key wetlands and state-level natural reserves in China, the Qinghai Lake is located on the Qinghai-Tibet Plateau, 4,500 meters above the sea level. It is well-known as a paradise for wild animals including various birds. Bar-headed geese, gulls and cormorants nest and breed here in summer, while migrant birds including whooper swans spend winter on the lake, which forms a fascinating scenery in winter. [Photo/Xinhua]