A bevy of swans perch in the swamp of the Yellow River delta in north China's Shandong Province, Nov. 3, 2009. This area has gradually regained a bird habitat since a series of environmental friendly measures have been carried out in the past years. (Xinhua/Fan Changguo)

Reed is seen in sunset in the swamp of the Yellow River delta in north China's Shandong Province, Nov. 3, 2009.(Xinhua/Chen Yehua)