Two wild ducks prepare to fly in Yellow River Wetland in Zhengzhou, capital of Central China's Henan province, May 24, 2014. 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]