What makes a bird a bird?

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Tags

  1. #birds
  2. #creatures
  3. #animal
  4. #beaks
  5. #scales
  6. #mammal
  7. #feathers
  8. #hooves
  9. #human
  10. #horns
  11. #living
  12. #lizard
  13. #fingernails
  14. #makes
  15. #protein
  16. #keratin