| 21. | Most baleen whales make sounds at about 15 20 hertz.
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| 22. | Baleen whales have bristles made of keratin instead of teeth.
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| 23. | Unlike other mammals, the lungs of baleen whales lack lobes and are more sacculated.
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| 24. | The sei whale looks similar to other large baleen whales.
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| 25. | Baleen whales have a small, yet functional, vomeronasal organ.
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| 26. | Unlike in toothed whales, baleen whales have sweat glands.
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| 27. | Baleen whales are polygynous, in that a male may mate with more than one female.
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| 28. | Scientists currently recognize 70 whale species, including as many as 12 types of baleen whales.
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| 29. | Baleen whales are largely monogamous within each reproductive period.
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| 30. | The meat, blubber, baleen, and oil of baleen whales have traditionally been used by the strandings.
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