Do Swans mate with their siblings?

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Tags

1. #season
2. #finding
3. #offspring
4. #bonded
5. #other
6. #extra
7. #swans
8. #courtship
9. #these
10. #birds
11. #young
12. #unusual
13. #produce
14. #raise
15. #complete
16. #their
17. #mates
18. #really
19. #exceptions
20. #female