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).

 
  • 蒙古銀鷗成鳥(niǎo)冬羽:這只已有完整的初級飛羽白色羽尖新羽(蒙古銀鷗是三種中最早完成換羽的)。
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