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A fully developed, mature bird that is able to breed. It is in its final plumage, which no longer changes pattern with age, although it may change with season [1].


  1. ^ France, Peter; et al. (2007). Bird: The Definitive Visual Guide. Dorling Kindersley Inc. ISBN 9780756631536. 
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.