Class Aves Introduction Crossword

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Across
  1. 6. shedding and new growth of feathers
  2. 7. transitional bird fossil
  3. 10. protein making up feathers
  4. 12. wingspan in feet of the albatross
  5. 15. class of pheasants
  6. 18. the rate used to measure energy
  7. 20. the collective feathers of a bird
  8. 23. class of birds with raptor feet
  9. 24. horned bill
  10. 25. vocal organ
Down
  1. 1. the muscle birds lack for respiration
  2. 2. claw winged bird
  3. 3. attachment for flight muscles
  4. 4. skeletal connection with dinosaurs
  5. 5. class birds belong
  6. 8. subphylum birds belong
  7. 9. one purpose of feathers
  8. 11. animal generating its own heat
  9. 13. common name for furcula
  10. 14. one reason bones are hollow
  11. 16. modified scales
  12. 17. helpless state of young
  13. 19. bird with the shortest wingspan
  14. 21. another name for dinosaurs
  15. 22. modified appendages