Adult winter Mongolian Gull: This bird has new primaries with white tips (Mongolian is the first of the three species to complete its primary moult).

• 蒙古银鸥成鸟冬羽：这只已有完整的初级飞羽白色羽尖新羽(蒙古银鸥是三种中最早完成换羽的)。