Do ducks talk to each other?

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Tags

1. #voices
2. #scientists
3. #while
4. #communicate
5. #country
6. #birds
7. #shouting
8. #ducks
9. #other
10. #quack
11. #hustle
12. #bustle
13. #vocalizations
14. #found
15. #softer
16. #above
17. #language