Herring Gull (argentatus & argenteus)

(last update: February 11, 2013)

Thayer's Gull thayeri 2nd cycle (3CY), February 18 2012, Davis, CA. Picture: Steve Hampton.

Advanced bird with almost completely grey saddle. Dark iris. Dark centres of tertials. Note the rather solid brown, slightly marbled greater coverts and outer primaries darkest part in resting bird (dark brown, not blackish).