Swans fly over a river in Datan Town in Man Autonomous County of Fengning, north China's Hebei province, April 16, 2015. Better environment here has attracted an increasing number of swans in recent years. (Photo: Xinhua/Chen Qijia)
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Swans fly over a river in Datan Town in Man Autonomous County of Fengning, north China's Hebei province, April 16, 2015. Better environment here has attracted an increasing number of swans in recent years. (Photo: Xinhua/Chen Qijia)
