A whalebone whale(Balaena mysticetus)of Arctic seas,having a very large head and an arched upper jaw.

• 北极露脊鲸，弓头鲸生活在北冰洋的一种有鲸须的鲸鱼(北极露脊鲸露脊鲸属)，具有大的头部和拱形的上颚