On May 24 of 2012, a total of 640 Relict Gulls (Larus relictus), including 285 individuals observed sitting on nest, were counted in Aotai Lake, a wetland located at western suburban of Hohhot City of Inner Mongolia. Those Relict Gulls were observed on the four islets in the lake and nesting in the areas 20-50 cm above the water level. This finding brought with an unknown breeding site of the Relict Gull.