| 1. | Baleen record method
鲸须年龄查定法
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| 2. | Large baleen whales primarily use the lower frequencies and are often limited in their repertoire
大长须鲸最初使用低频，他们的全套本领很有限。
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| 3. | However , the position of the eyes so restricts the field of vision in baleen whales that they probably do not have stereoscopic vision
但是，由于眼睛的位置太受约束，长须鲸可能没有立体视觉。
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| 4. | They have also unearthed some clues from the ensuing oligocene , when the modern suborders of cetaceans ? the mysticetes ( baleen whales ) and the odontocetes ( toothed whales ) ? arose
在随后的渐新世地层中，他们也找到了一些线索；须鲸亚目（有鲸须的鲸鱼）与齿鲸亚目（有齿的鲸鱼）就是在那时候分化的。
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| 5. | Toothed species in general employ more of the frequency spectrum , and produce a wider variety of sounds , than baleen species ( though the sperm whale apparently produces a monotonous series of high - energy clicks and little else )
齿鲸一般是用更多频率并且产生一个广的变化的声音，和长须鲸相比(尽管抹香鲸显然能发出一系列单调的高能咔嚓声，其他基本不会) 。
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