1. Looks like a worn and moulting Arctic Warbler. 看起来像是只羽毛磨损且正换羽中的极北柳莺。
2. Moulting usually takes place in the protected moist environment of their burrows. 它们总是选择安全且潮湿的地洞来完成脱壳。
3. 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. 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。
英英解释
n.
1. periodic shedding of the cuticle in arthropods or the outer skin in reptiles