A pair of unstreaked Acrocephalus warblers nested in Orkney in 1993 (Adam & Meek 1994; Ogilvie et al. 1996). Based on (1) comparison of measurements with Walinder et al. (1988), (2) the birds' general coloration and (3) the comparative frequency of Marsh Warblers A. palustris and Reed Warblers A. scirpaceus in Scotland in spring, identification as Marsh Warblers was felt to be almost certain, b

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