| 11. | They have small pectoral fins to help them navigate along river bottoms.
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| 12. | The pectoral fins are large with the tip reaching the anal fin.
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| 13. | It is supposed that tunas primarily use their pectoral fins for lift.
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| 14. | The anterior lobes of the pectoral fins are free from the head.
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| 15. | Humpbacks frequently use their pectoral fins as village tom-toms, slapping the water repeatedly.
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| 16. | The pectoral fins are far forward and low on the body.
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| 17. | The pectoral fins are rather large and broad, with rounded corners.
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| 18. | The anal opening is under the head or the pectoral fins.
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| 19. | The spine of the pectoral fin is serrated on both sides.
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| 20. | The pectoral fins are fairly large and wide, with rounded tips.
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