The traditional view, that a Phylloscopus warbler in Britain which displayed a single wing-bar must be either an Arctic Warbler P. borealis or a Greenish Warbler P. trochiloides, has received support in all but the most recent identification literature. During the late 1950s and early 1960s, a number of decidedly grey, drab Phylloscopus warblers, each with a single, narrow, whitish wing-bar, were

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