White swans rest on the Qinghai Lake, northwest China's Qinghai Province, Jan. 1, 2013. The improving environment of the Qinghai Lake has attracted more swans to spend the winter here. Photo: Xinhua
White swans fly along the Qinghai Lake, northwest China's Qinghai Province, Jan. 1, 2013. The improving environment of the Qinghai Lake has attracted more swans to spend the winter here. Photo: Xinhua
A white swan is seen on the Qinghai Lake, northwest China's Qinghai Province, Jan. 1, 2013. The improving environment of the Qinghai Lake has attracted more swans to spend the winter here. Photo: Xinhua
White swans are seen on the grassland along the Qinghai Lake, northwest China's Qinghai Province, Jan. 1, 2013. The improving environment of the Qinghai Lake has attracted more swans to spend the winter here. Photo: Xinhua