glaucoides - kumlieni

(last update: January 26, 2012)
Coordinators:
Dave Brown (Canada)
Bruce Mactavish (Canada)
Chris Gibbins (Scotland)
Peter Adriaens (Belgium)
Mars Muusse (Netherlands)

PDF's
Ringed birds
Iris classification
Primary classification

1cy Aug - Dec

2cy January
2cy February
2cy Mar - Apr
2cy summer
2cy Sept - Dec

3cy January
3cy February
3cy Mar - Apr
3cy summer
3cy Sept - Dec

sub-ad Jan - Apr
sub-ad summer
sub-ad Sept - Dec

adult January
adult February
adult Mar - Apr
adult summer
adult Sept - Dec

Adult Thayer's Gulls (thayeri) adult, February 07 2011, Oregon, USA. Pictures: John Rakestraw.

Classic Thayer's Gull adult. Note blackish pigmentation on outer primaries and dark iris. This would be a "Stage 6" bird, with darker grey or more extensive grey marks on the outer six primaries with complete subterminal bands on three to four primaries among P6-P9. This stage 6 was scored in 5% of the adult Kumlien's at Newfoundland in the research by Howell & Mactavish. For explanation, see chart.

John's website.