Herring Gull - Zilvermeeuw (argentatus & argenteus)

(last update: 14 september 2004)

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Herring Gull CU378cy (argentatus), January 16 2004, Lubna rubbish dump, Poland (52°02'N 21°08'E).

CU37 was ringed as pullus on July 06 1997, in Savonlinna, Mikkeli, Finland (61°59'N 28°40'E).

Adult birds from the western populations argenteus show more black in the outer primaries, compared to northern argentatus. In argenteus, P5 normally shows small black sub-terminal markings, concentrated on the outer-web as a clear-cut black angular spot and in some birds extending on the inner-web as a diffuse streak. There may be some black on P4 as well, although this might be a clue for near-adult birds. In argentatus, especially from far northern Scandinavia, the black marking on P5 is completely lacking or is very limited and diffuse.
Argenteus
often has a black sub-terminal band on the top of P10, dividing the tip from the mirror. If the black sub-terminal band on P10 is broken, there is often still black on the inner and outer-web's edge of P10. Normally argentatus lacks sub-terminal markings on the outer-web of P10.
In adult Herring Gull, the scapular coverts are plain grey, lacking white crescents. The tertials show obvious white tips. The iris is yellow. The bill is yellow with a red gonydeal spot, confined to the lower mandible. The orbital ring is yellowish or yellow-orange in argenteus; slightly orange-red or coral red in most argentatus; especially birds from the Baltic region show a bias to reddish orbital rings. The legs are flesh-pink in argenteus, but may show a yellowish hue or appear very clear yellow in some argentatus (from either the Baltic region or far northern Finnmark). Furthermore, adult argentatus from Finnmark also seem to develop "bubble-gum" pink legs.