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Abrupt narrowing of the inner web of an outer primary feather [1].

References[]

  1. ^ Clark, William S.; Brian K. Wheeler (2011). Hawks of North America, 2nd Edition. Boston, MA: Houghton Mifflin Company. p. 12. ISBN 0395670675.  Cite uses deprecated parameter |coauthors= (help);
Anatomy of an amiotic egg This article is part of Project Glossary, an All Birds project that aims to write comprehensive articles on each term related to animals.


Little Pied Cormorant 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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