“鲸类”的英语？

鲸类动物在休息时减少它们的呼吸次数.Cetaceans reduce the number of breaths they take during rest periods.鲸类动物是否经历梦睡眠还不清楚.It is not clear whether cetaceans undergo dream sleep.须鲸类;露脊鲸;长须鲸; 蓝鲸;座头鲸.Any of various similar cetaceans, such as t...