Do pigeons sleep?

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Tags

1. #researchers
2. #presumably
3. #taking
4. #hours
5. #spend
6. #sleep
7. #during
8. #birds
9. #means
10. #recover
11. #prevented
12. #having
13. #capacity
14. #study
15. #their
16. #pigeons
17. #other
18. #generally
19. #without
20. #sleeping
21. #something