Last Updated
：2025/12/05
Quizzes for review
The plumage of a bird following its first moult (or the first of a year)
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basic plumage
After the autumn moult, the young gull's basic plumage made it difficult to distinguish it from adult birds.
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After the autumn moult, the young gull's basic plumage made it difficult to distinguish it from adult birds.
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