Can a black swan mate with a white swan?

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Tags

1. #offspring
2. #white
3. #mottled
4. #preferentially
5. #hybridised
6. #selecting
7. #black
8. #species
9. #relative
10. #swans
11. #select
12. #nearer
13. #large
14. #producing
15. #recorded
16. #therefore
17. #young
18. #other