雖然普通潛鳥看似無害,但只要有任何闖入者侵入了牠們的淡水棲地,這種領域性鳥類就會發起猛烈攻擊。PHOTOGRAPH BY CHARLIE HAMILTON JAMES, NAT GEO IMAGE COLLECTION
歸功於保育工作,數十萬隻白頭海鵰如今在美國的天際翱翔。PHOTOGRAPH BY GEORGE GRALL, NAT GEO IMAGE COLLECTION
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