Thayer's Gull, Larus thayeri:

: juvenile (standing + flying) from Texas in November
: a juvenile (standing) from Washington in Nov; poss. intergrade? - added 01/25/00
: a juvenile (standing) from Washington in November
: a juvenile (standing) from Washington in December
: juvenile (standing) - from Texas in Dec; and I thought I'd figured these things out.....
: juvenile (standing + flying) from Texas in November - a dark example - added 12/28/00
: juvenile (standing + flying) from Texas in December - added 12/28/00
: a juvenile (standing) from Washington in January
: a chunky juvenile -? (standing + flying) from Texas in December - added 01/06/05
: a small, pale juvenile (standing + flying) from Texas in January - added 01/06/05
: a 1st-basic (standing) from Washington in January
: a 1st-basic (standing) from Washington in January
: a 1st-basic (standing) from Washington in Dec. - is this a kumlieni intergrade?
: 1st-basic Thayer's-type with pale primaries and kumlieni-like scapulars
: 1st-basic (standing + flying) with worn/faded plumage
: 1st-basic (standing) from NW Mexico in January
: 1st-basic (standing) three different birds from NW Mexico in January
: 1st-basic (flying) from NW Mexico in January
: 1st-basic (flying) from NW Mexico in January
: 1st-basic (flying) - an unusual bird from Colorado in February
: 1st-basic (standing,flying) - an intergrade bird from Colorado in February?
: 1st-basic (standing + flying) from Texas in February - with some GWGU features
: 1st-basic (standing + flying) from Texas in February - a finely-marked bird
: 1st-basic (standing + flying) from Texas in February - a coarsely-marked bird
: 1st-basic (standing + flying) from Texas in February - added 02/13/08
: 1st-alternate (standing); very faded; bill more like kumlieni in color for this age?
: a chunky 2nd-cycle -? (standing) from Texas in late March - added 04/02/06
: 3rd-alternate (standing) with very kumlieni-like wings; can fading really do this?
: definitive-alternate (standing) with adult California Gulls
: definitive-alternate (standing) from Churchill, Manitoba
: a definitive-basic (standing) from Washington in November
: a definitive-basic (standing) from Washington in November
: two def.-basics (head shots) from Washington in December & November
: a def.-basic (standing) (plus adult GWGU) from Washington in December
: a def-basic (standing) from Washington in Nov - with paler eye - added 01/25/00
: def-basic (standing + flying) from Texas in December - added 12/28/00
: def-basic (standing + flying) from Texas in February - added 02/23/05
: def-basic (standing + flying) from Texas in February - added 04/02/06