1. Looks like a worn and moulting Arctic Warbler. ����������ֻ��ëĥ�����������еļ�����ݺ��
2. Moulting usually takes place in the protected moist environment of their burrows. ��������ѡ��ȫ�ҳ�ʪ�ĵض�������ѿǡ�
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. ���^���ڣ����������Ҫ������ͷ��ȫ��������ֱ������֣��Ǿͺ����ų���Щ����ϳٵ�֯Ů��Ÿ���塣
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n.
1. periodic shedding of the cuticle in arthropods or the outer skin in reptiles