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Sei Whale,
B. borealis
Sei Whale和Fin Whale比較相似,而牠的名字是從挪威(Norway)所得的,命名之時Sei whale在Norwegian海岸邊出現,而時間則是coal-fish(or sei)的捕捉時期,因此而名.
Sei whale可以長至20metres,通常女的有16m,而男的有15m.牠們的背部和兩邊呈灰色,底部的後端也是灰色,有一部分是灰白色的.這白白的肚皮比藍鯨和Fin whale的白肚皮較小(比例上).
鯨須(baleen)方面,和藍鯨一樣是黑色的,不過比較精緻些,有灰色的邊緣.Sei Whale也是冷海區的鯨魚,不過和藍鯨、Fin whale比較起上來,所住的地方是較暖些.