Mottled, blue-gray baleen whale (Balaenoptera musculus), also called sulfur-bottom whale because of the yellowish diatoms on some individuals.

• 一种带有淡色斑点的蓝灰色须鲸，学名Balaenoptera musculus，亦称硫底鲸，因为有些个体的身上长有浅黄色的矽藻而带硫黄色。