Identification of Blyth's Reed and Paddyfield Warblers

I have seen only one Blyth's Reed Warbler Acrocephalus dumetorum (Brit. Birds 63: 214216) and no Paddyfield Warblers A. agricola, but I have examined a large number of published and unpublished black-and-white photographs and colour transparencies of die two species. In every instance, the portrait has been instantly identifiable by one featu


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