nuptial plumage

zoology

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In anseriform: Life history
…“basic”) plumage, acquiring the first nuptial (or “alternate”) plumage in the second autumn. Other species molt directly from juvenal to nuptial and are practically indistinguishable from adults in plumage and size at the age of six months. Swans and geese do not reach full size until the end of their…
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