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Juvenile

See here.

Post-juvenile

See here.

Young

See here.

Immature

See here.

1st-autumn

A bird it its first autumn, 2-5 months old. It refers to its age and not its plumage [1].

1st-winter

An age category usually referring to the plumage following that of a juvenile bird, usually gained through a partial or complete (in some species) moult in late summer/autumn of the 1st calendar year and is worn until the next spring of the 2nd calendar year [1].

1st-summer

An age category usually referring to the plumage worn at the approximate age of one year and attained in late winter/spring through partial or complete moult from 1st winter plumage; worn into the next moult usually in late summer/autumn of the same year, replaced with the 2nd winter plumage [1].

2nd-winter

A complete or partial moult in late summer of the 2nd calendar year and worn until the next moult, it is followed by the 1st-summer plumage [1]


2nd-summer

References

  1. ^ a b c d 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 This article is part of Project Glossary, a All Birds project that aims to write comprehensive articles on each term related to animals.


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