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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, a All Birds project that aims to write comprehensive articles on each term related to animals.

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