Herring Gull (argentatus & argenteus)

(last update: February 11, 2013)

Coordinators:
Jean-Michel Sauvage (France)
Mars Muusse (the Netherlands)

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Herring Gull plumages:

HG 1cy July
HG 1cy August
HG 1cy September
HG 1cy October
HG 1cy November
HG 1cy December

HG 2cy January
HG 2cy February
HG 2cy March
HG 2cy April
HG 2cy May
HG 2cy June
HG 2cy July
HG 2cy August
HG 2cy September
HG 2cy October
HG 2cy November
HG 2cy December

HG 3cy January
HG 3cy February
HG 3cy March
HG 3cy April
HG 3cy May
HG 3cy June
HG 3cy July
HG 3cy August
HG 3cy September
HG 3cy October
HG 3cy November
HG 3cy December

HG sub-ad Jan.
HG sub-ad Feb.
HG sub-ad March
HG sub-ad April
HG sub-ad May
HG sub-ad June
HG sub-ad July
HG sub-ad Aug.
HG sub-ad Sept.
HG sub-ad Oct.
HG sub-ad Nov.
HG sub-ad Dec.

HG adult January
HG adult February
HG adult March
HG adult April
HG adult May
HG adult June
HG adult July
HG adult August
HG adult September
HG adult October
HG adult November
HG adult December

Great Black-backed Gull marinus x Herring Gull argentatus hybrid? HT-252852 4CY, November 14 2007,
Kalote dump Klaipeda, Lithuania. Picture: Vytautas Pareigis.

4cy bird, probably hybrid Larus argentatus x marinus, HT-252852 ringed as pullus on June 26 2004 in Kuusamo, N. Finland (65.57'N 29.14'E).

Bird recalling Slaty-backed Gull, but some differences, notably wingtip pattern.
Upperpart grey tone as in Lesser Black-backed Gull, with speckled iris and much head streaking. Large mirrors on outer two primaries, no sub-terminal band on P10. Not very broad white tips of tertials which is normal in Slaty-backed, where it continues on the tips of the secondaries.