By Martin Collinson, Amanda Murcia Sanches, Gustavo Ferreira, Kirsty Dewars, Florence Roberts and Thomas Shannon Abstract Three subspecies of Common Chiffchaff Phylloscopus collybita have occurred in Britain. ‘Siberian Chiffchaff’ P. c. tristis is now recognised as a scarce but regular migrant to western Europe, but the extralimital status of presumed Scandinavian individuals of P. c. ab

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