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Usually the upperwing coverts (or at least the foremost of these) on the 'arm' of of a spread wing [1].

References

  1. ^ Mullarney, Killian; Lars Svensson, Dan Zetterström and Peter J. Grant (1999). Birds of Europe. Princeton University Press. ISBN 0691050538.  Cite uses deprecated parameter |coauthor= (help)
Anatomy of an amiotic egg.svg This article is part of Project Glossary, a All Birds project that aims to write comprehensive articles on each term related to animals.


Little Pied Cormorant.jpg 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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