European Herring Gull, Larus argentatus argenteus:

: 3rd-Alternate (standing) from Scotland (Jun)
: adult-Basic (flying) from England (Dec) - but is it an argentatus?
: first-basic (standing) from England (Mar)
: first-basic (standing) from England (Mar)
: two first-basics (flying) from England (Mar)
: third-basic (flying) from England (Mar)
: definitive-basic (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
: 3rd-basic (standing) from Belgium (Aug) 10/09/99