Egrets fly over the Heihe wetland of Gaotai County in Zhangye City, northwest China's Gansu Province, September 7, 2009. The birds Population there has increased thanks to the efforts that have been made to protect the environment of the wetland in the city. [Xinhua]

Egrets fly over the Heihe wetland of Gaotai County in Zhangye City, northwest China's Gansu Province, September 7, 2009. [Xinhua]