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  1. DMW

    Oceanodroma monorhys at Portugal

    There's a paper online somewhere, from memory one specimen with an all dark rump, a few with reduced white probably related to late-summer wear. Swinhoe's is rare, but pretty much annual in WP waters. It seems to be the equivalent of the runt Manx theory!
  2. DMW

    Oceanodroma monorhys at Portugal

    I know this always gets brought up in conversations about dark-rumped petrels in the North Atlantic, but doesn't the evidence suggest that such aberrant Leach's Petrels are vanishingly rare?