Why do swifts fly in circles?

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Tags

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  2. #breaking
  3. #extreme
  4. #enhanced
  5. #turns
  6. #tunnel
  7. #flying
  8. #changes
  9. #night
  10. #sweep
  11. #reveals
  12. #these
  13. #almost
  14. #study
  15. #different
  16. #their
  17. #roost
  18. #altitude
  19. #swift
  20. #ability
  21. #spend
  22. #conditions
  23. #wings