How do Swans stay warm in the winter?

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Tags

  1. #secret
  2. #climate
  3. #clean
  4. #bodies
  5. #these
  6. #birds
  7. #pockets
  8. #flexible
  9. #maintaining
  10. #winter
  11. #layers
  12. #important
  13. #having
  14. #their
  15. #summer
  16. #around
  17. #anticipation
  18. #weight
  19. #trapping
  20. #feathers