Definition: The delayed development of a bird's definitive plumage such that the bird reaches sexual maturity before its immature plumage has been relaced. Occurs more frequently in the males of a species.
definitive plumage such that the bird reaches sexual maturity before its replaces its immature plumage has been relaced. Occurs more frequently in the males of a species.">
By Laura Klappenbach, About.com Guide