Why do seals slap their bellies?

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Tags

1. #produces
2. #communication
3. #aggression
4. #girth
5. #seals
6. #slaps
7. #their
8. #courtship
9. #hitting
10. #variety
11. #study
12. #seismic
13. #waves
14. #blubbery
15. #scientists
16. #including
17. #belly
18. #display
19. #actually
20. #harbor