| 1. | Male right whales have a higher density of callosities than females.
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| 2. | Male right whales have bigger callosities than female right whales.
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| 3. | Bowhead whales completely lack callosities, the easiest way to distinguish the two species.
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| 4. | Large head covered with bumps ( callosities)
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| 5. | The evolutionary purpose of callosities is unknown.
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| 6. | The columella is nearly straight, covered by the inner lip which forms a callosity.
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| 7. | The edge of the callosity is always of a more or less deep orange color.
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| 8. | Whale louse infestations are especially evident in right whales, where colonies propagate on their callosities.
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| 9. | The six columella is wrinkled and covered at its base with a thin, raised callosity.
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| 10. | In them the lip is thin, smooth, and the callosity does not exist upon the columella.
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