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A whalebone whale(Balaena mysticetus) of Arctic seas, having a very large head and an arched upper jaw. 北極露脊鯨，弓頭鯨生活在北冰洋的一種有鯨須的鯨魚（北極露脊鯨露脊鯨屬），具有大的頭部和拱形的上顎。