Big Bear Eagles - Feathered Friends

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Across
  1. 7. Innermost flight feathers, attached to humerus ('upper arm') bone
  2. 8. Yearly process of losing/regrowing plumage
  3. 9. Gland near base of tail, providing oil to waterproof feathers
  4. 11. Where feathers originate (like hair on mammals). Two 'foci' in BAEA, forming outer and inner shaft of feather
  5. 13. Feathers on back of BAEA head, raised when alarmed
  6. 14. Flight feathers, attached to wing bones
  7. 15. (2 words) Developing feathers, in keratin sheath with blood circulation
  8. 16. 'Spine' or shaft of a single feather
  9. 18. Short wing feathers on Eagle's 'thumb' bone
  10. 19. 'Feather tracts' on Eagle's body - noticeable on growing eaglets
  11. 20. Feather bodies radiating out from feather's shaft, branching into barbules
Down
  1. 1. (2 words) "Spread Eagle" posture, helps regulate temperature
  2. 2. (2 words) Hatchling's first feather layer, replaced by Juvenile/Adult plumage
  3. 3. (2 words) Inner feather layer, provides insulation, retains heat
  4. 4. Flight feathers on Eagles' wings
  5. 5. Flight feathers attached to wing's ulna ('forearm') bone
  6. 6. Flight feathers on tail - 'rudders'
  7. 10. (2 words) Short, specialized sensory feathers found around eagle's beak, like a cat's whiskers
  8. 12. Outer layer of BAEA's feathers, covers, protects from rain, snow
  9. 15. Outermost flight feathers, attached to metacarpals ('hand')on wing
  10. 17. Using beak to spread oil, groom feathers