Photo taken on April 21, 2010, shows brown-headed gulls playing on the Pangong Lake, Rutog County, western Tibet's Ngari Prefecture. Lying on the China-India border, the lake is one of the three major boundary lakes in the country. With a host of islands, the lake has attracted various precious species of birds, including those under national protection such as brown-headed gulls, cygnets, yellow ducks, bar-headed geese and black-necked cranes. (Xinhua Photo) 

Brown-headed gulls fly against the sun over the Pangong Lake, Rutog County, Ngari Prefecture, western Tibet. (XInhua Photo)

Photo taken on April 21, 2010, shows brown-headed gulls ready to flap their wings on an island in the Pangong Lake. (XInhua Photo)

 Photo taken on April 21, 2010, shows eggs of a brown-headed gull in the Bird Island, Pangong Lake, Rutug County, western Tibet's Ngari Prefecture. (XInhua Photo)

 
Photo taken on April 21, 2010, shows brown-headed gulls dancing on the Pangong Lake, Rutog County, western Tibet's Ngari Prefecture. (XInhua Photo)