In light of the captures of Swinhoe's Storm-petrel Oceanodroma monorhis in the Western Palearctic (Bretagnolle et al. 1991; Cubitt et al. 1992; King & Minguez 1994), it was thought unlikely that there could be more than one dark-rumped Oceanodroma species occurring in the north Atlantic. 'The Chalice petrel' became linked to the then-unidentified, trapped species (Gantlett 1988). A widely express
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