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