Hey, Bird-brain, This Review's for You! (Chapter 17)

1234567891011121314151617181920212223
Across
  1. 3. the bird's specialized voice box, creates the "song"
  2. 6. wing feathers supported by the bird's "thumb" bones
  3. 7. flying which allows spiraling to great heights
  4. 8. filaments that help form the vane of the feather
  5. 10. the flat surface of the feather
  6. 15. a clear protective eyelid in birds
  7. 16. in marine birds it eradicates excess sodium chloride
  8. 18. UV revealed flower part used to find nectar by birds
  9. 20. soft, fluffy feathers used for insulation
  10. 21. extensions of the trachea used during respiration
  11. 22. a storage sac in the esophagus of a bird
  12. 23. probably the most remarkable sense in birds.
Down
  1. 1. in young birds, it produces lymphocytes
  2. 2. special contour feathers of the wings
  3. 4. organ used for both elimination and reproduction in birds
  4. 5. avian red blood cells containing nuclei
  5. 9. the stiff quill of a feather
  6. 11. flight generated by flapping the wings
  7. 12. feathers that streamline the shape of the bird
  8. 13. a fiber subdivision of a barb (a smaller part)
  9. 14. a flight pattern used by the albatross(low energy)
  10. 17. in birds, it grinds food into smaller pieces for digestion
  11. 19. a special helicopter-action of hummingbird flight