Herring Gull- Zilvermeeuw (argentatus & argenteus)(last update: December 15, 2011
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Herring Gull - 1cy JulyIntroduction This website deals with the Herring Gulls of the taxa argentatus and argenteus. Argenteus is an abundant breeding species on Iceland, Britain, NW France, Belgium, the Netherlands and N Germany. The taxon argentatus breeds in NE Europe, from Denmark, the coast of the Baltic Sea, Scandinavia and coast of the White Sea. In the centre of the breeding range (Denmark and the NW German coast), birds show intermediate characteristics, indicating there is a cline in argenteus-argentatus. Argenteus in Western Europe is pale-backed, slightly smaller and with relatively much black in the wing-tip; argentatus in the NE Europe is larger, slightly darker on upper-parts and show less black in the wing-tip. 1cy Herring Gull: description for July In juvenile plumage, the head and under-parts are streaked grey-brown, rather pale on forehead and throat and with dark ear-coverts. The mantle and scapulars are brown based with buffish-yellowish fringes when the feathers are fresh. The notched pattern is repeated on the lesser, lower lesser and median coverts, although the medians often have paler centres. The greater coverts show a 'piano-key' pattern, obvious on the outer greater coverts as well in western populations (British argenteus). Some 1cy July argentatus (e.g. this argenteus and this argentatus) may have the outer greater coverts with extensive dark centres, lacking obvious notching and thin fringes on the tertials, like in michahellis. On average, the tertials have an obvious notched pale fringe and transversal bar. Again, this is more pronounced in argenteus than in argentatus. The secondaries, primaries and primary coverts are dark with a small white tip, but the inner primaries show an obvious, sometimes translucent, pale window, prominent from below and above. The under-wing is rather uniform grey-brown patterned. The tail has a broad sub-terminal band and isolated dark bars on the basal half. Some argentatus show a broken tail-band, reminiscent to Great Black-backed Gull (L. marinus). The iris is very dark, the bill is blackish, sometimes with a paler base, and the legs are flesh-pink with dark shins. 1cy Herring Gull: post-juvenile moult The partial autumn moult (moult into so-called "first winter" plumage) includes the body and head feathers. This moult starts as soon as the nest is abandoned (especially in southern populations) and continues until January. Early argenteus juveniles fledge by late-June in the Netherlands, argentatus fledge mid-July in northern USSR. The post-juvenile moult is most extensive in southern Herring Gull populations. Northern juvenile argentatus may postponed the post-juvenile moult until February, hence retain a juvenile plumage (e.g. this Russian 2cy argentatus in February). 1cy July argenteus is normally in complete juvenile plumage. Most advanced birds have a few upper scapulars and some mantle feathers replaced. Active moult is obvious by the moult gaps. 1cy argenteus in the Netherlands still have to grown the outer primaries by mid-July, as can be seen in the images. 1cy Herring Gull July: tables to include: |
rings argenteus: the Netherlands |
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Herring Gull K.C 1cy (argenteus), July 24 2013, Katwijk, the Netherlands. | ||
Herring Gull Y.BTH 1CY (argenteus), July 30 2014, IJmuiden, the Netherlands. | ||
Herring Gull K.ACM 1cy (argenteus), July 25 2010, Texel, the Netherlands. | ||
Herring Gull K.ACS 1cy (argenteus), July 25 2010, Texel, the Netherlands. | ||
Herring Gull K.ACX 1cy (argenteus), July 25 2010, Texel, the Netherlands. | ||
Herring Gull K.AFN 1cy (argenteus), July 25 2010, Texel, the Netherlands. | ||
unringed 1cy Herring Gulls |
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Herring Gull 1cy (argenteus), July 30 2014, IJmuiden, the Netherlands. | ||
Herring Gull 1cy (argenteus), July 30 2014, IJmuiden, the Netherlands. | ||
Herring Gull 1cy (argenteus), July 30 2014, IJmuiden, the Netherlands. | ||
Herring Gull 1cy (argenteus), July 30 2014, IJmuiden, the Netherlands. | ||
Herring Gull 1cy (argenteus), July 30 2014, IJmuiden, the Netherlands. | ||
Herring Gull 1cy (argenteus), July 30 2014, IJmuiden, the Netherlands. | ||
Herring Gull 1cy (argenteus), July 30 2014, IJmuiden, the Netherlands. | ||
Herring Gull 1cy (argenteus), July 30 2014, IJmuiden, the Netherlands. | ||
Herring Gull 1cy (argenteus), July 30 2014, IJmuiden, the Netherlands. | ||
Herring Gull (argenteus) 1CY, July 31 2015, Noordwijk, the Netherlands. | ||
Herring Gull (argenteus) 1CY, July 31 2015, Noordwijk, the Netherlands. | ||
Herring Gull (argenteus) 1CY, July 31 2015, Noordwijk, the Netherlands. | ||
Herring Gull (argenteus) 1CY, July 31 2015, Noordwijk, the Netherlands. | ||
Herring Gull (argenteus) 1CY, July 31 2015, Noordwijk, the Netherlands. | ||
Herring Gull 1cy (argenteus), July 18 2013, Katwijk, the Netherlands. P6/P9. | ||
Herring Gull 1cy (argenteus), July 18 2013, Katwijk, the Netherlands. P6/P9. | ||
Herring Gull 1cy (argenteus), July 18 2013, Katwijk, the Netherlands. P6/P9. | ||
Herring Gull (argenteus) 1CY, July 31 2015, Noordwijk, the Netherlands. | ||
Herring Gull (argenteus) 1CY, July 31 2015, Noordwijk, the Netherlands. | ||
Herring Gull (argenteus) 1CY, July 31 2015, Noordwijk, the Netherlands. | ||
Herring Gull 1cy (argentatus), July 11 2003, Tampere, Finland (61.31N, 23.43E). | ||
Herring Gull 1cy (argentatus), July 15 2003, Tampere, Finland (61.31N, 23.43E). |