Plumage Stage
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<birdfyi-glossary slug="plumage-stage"></birdfyi-glossary>Định Nghĩa
A recognizable phase of feather appearance (juvenile, immature, breeding, nonbreeding) useful for aging birds.
Giải Thích Chi Tiết
Age terminologies vary by system: the Humphrey-Parkes system uses 'first basic', 'second alternate' etc.; the European 'calendar year' system (1CY, 2CY) counts years from hatching. Plumage stages are essential for identifying species with delayed plumage maturity (large gulls, eagles) where birds take 3-5 years to reach definitive adult plumage. Field guides for these groups often devote separate plates to each plumage stage, reflecting the complexity and identification challenge they present.