large and rare Arctic falcon having white and dark color phases 同义词：gerfalcon, Falco rusticolus,
例句与用法
1.
These are the signs of the coming arctic winter : the color of the tundra changes as the water grasses turn brilliant red . the migratory birds gather in flocks along the coast and gradually drift southward . most of the birds that have spent the brief summer on the tundra now disappear , leaving only the golden eagle , the gyrfalcon , the ptarmigan , and the snowy owl to brave the sunless northern winter 这些都是北极地区冬季即将来临的征候：随着水草变成艳红色，北极苔原的颜色也改变了候鸟沿着海岸成群聚集，并逐渐南移在苔原度过短暂夏天的大部分鸟类现已消失，只剩下金鹰白隼松鸡和雪白色的猫头鹰来迎接这没有太阳的北极之冬。
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