A group of white swans forage in a lake in Yellow River Wetland in Sanmenxia, Central China's Henan province, Jan. 4, 2013. Yellow River Wetland is a National Natural Reserve with a total area of 68 thousands hectare in Henan province. It's a bird breeding place with over 41 types of animals under first-grade and second-grade protection at the state level. [Photo/Xinhua]