Recently, more than 800 world-famous species of relict gulls have returned to a wetland in Ordos, in north China's Inner Mongolia Autonomous Region. /Xinhua Photo 

This is the first time that the wetland has spotted a large number of relict gulls, indicating the restoration of ecological system in the region. /Xinhua Photo 

The relict gull is a species under first-class station protection in China. They have almost been completely disappeared due to the shrinking water level of the Ordos wetland lake since 2006. /Xinhua Photo