European Herring Gull, Larus argentatus argenteus:

: a series of 50+ first-cycle birds (standing and flying) from NE Scotland (late Feb) - added 03/29/10
: two first-cycle birds (flying) from England that show some smithsonianus-like traits - added 01/07/15
: first-basic (standing) from England (Mar)
: first-basic (standing) from England (Mar)
: two first-basics (flying) from England (Mar)
: group of 1st & 2nd-basic birds (standing) from England (Mar)
: another group of 1st & 2nd-basic birds (standing) from England (Mar)
: group of 1st & 2nd-basic birds (standing) from Belgium (Aug) 10/09/99
: another group of 1st & 2nd-basic birds (standing) from Belgium (Aug) 10/09/99
: 2nd-basic (standing) from Belgium (Aug) 10/09/99
: a pair of 2nd-cycle HERGs from Chicago and Scotland - they look like they've swapped continents.... - added 03/04/09
: 3rd-basic (standing) from Belgium (Aug) 10/09/99
: third-basic (flying) from England (Mar)
: 3rd-Alternate (standing) from Scotland (Jun)
: adult-Basic (flying) from England (Dec) - but is it an argentatus?
: definitive-basic (flying) from England (Mar)
: adults from Scotland with some smith-like patterns in the primaries - added 01/07/15
: adults from Scotland with small gray "mirrors" on P9/P10 - added 01/07/15 .