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 這些都是北極地區冬季即將來臨的征候:隨著水草變成艷紅色,北極苔原的顏色也改變了候鳥沿著海岸成群聚集,并逐漸南移在苔原度過短暫夏天的大部分鳥類現已消失,只剩下金鷹白隼松雞和雪白色的貓頭鷹來迎接這沒有太陽的北極之冬。