As part of the process of maintaining the totals of species falling within the ambit of the British Birds Rarities Committee*, we have been collating records of certain 'sub-rarities'. The species studied include (a) those which were formerly included in the BBRC's annual reports, (b) those considered as 'scarce migrants' (Sharrock 1969-73), (c) a group of commoner (though still scarce) migrants, (d) s

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