The small feathers covering the bases of the flight feathers and tail, above and below .
- ^ Clark, William S.; Brian K. Wheeler (2011). Hawks of North America, 2nd Edition. Boston, MA: Houghton Mifflin Company. p. 12. ISBN 0395670675.
|| This article is part of Project Glossary, a All Birds project that aims to write comprehensive articles on each term related to animals.
|| This article is part of Project Anatomy, a All Birds project that aims to write comprehensive articles on each anatomical term related to birds.
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