autumn molt
... 春季换羽 spring molt 秋季换羽 autumn molt 雏后换羽 postnatal molt ...
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在秋季后期,我们如果主要是利用头部全白与否来分辨这两种,那就很难排除那些换羽较迟的织女银鸥个体。
In the late autumn period, it may be more difficult to rule out late - moulting Vega Gulls if we are to use "white heads" as our main method of separating the two.
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