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The second plumage of a bird that takes more than one year to obtain adult plumage (e.g. eagles). Usually but not always acquired at one year of age and usually worn for a year. It is followed by Basic II, Basic II, etc. [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, a 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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