ABSTRACT The systematics and morphology of Common Chiffchaff Phylloscopus collybita of the Siberian subspecies tristis are much debated. Many putative tristis in Britain are distinctly pale and frequently attributed to `fulvescens', a form initially described by Severtzov in 1873 from a series collected in Central Asia. Treatment of the taxonomy and appearance of `fulvescens' is inconsistent. It is


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