Zilvermeeuw | Herring Gull | Larus argentatus
Zilvermeeuw | Herring Gull | Larus argentatus
Zilvermeeuw | Herring Gull | Larus argentatus
Zilvermeeuw | Herring Gull | Larus argentatus
2cy Herring Gull / Larus argentatus, Westkapelle - sea dike (The Netherlands) on 25 October 2011
2nd winter herring gull, showing lots of characters of Smithsonian Gull (Larus smithsonianus). Present at Westkapelle briefly on the morning of the 25th October. Pim Wolf and I saw this bird under very poor conditions (rain, low clouds, more rain, no light etc..). The bird loafed in a large group of Herring Gulls (both argenteus and argentatus of various age groups), Lesser and Greater Black-backed Gulls and a few Yellow-legged and Caspian Gulls. After a time we lost the bird in the large group of gulls and we did not see it again today, despite a lot of searching!. Personally I think it's a good candidate for smitsonianus, according to this table and the article written by Pat Lonergan & Killian Mullarney, this individual reaches a nice score of features!
  • 1. The dense brownish colouration on the lower hindneck and upper mantle, extending onto the underparts. Note that the colouration in the neck looks like a dark solid brown shawl.
  • 2. The tertials are very dark centred with only a white top and no white markings along the edges.
  • 3. Undertail-coverts, nicely barred, could be slightly denser and more regular for a "classic" bird.
  • 4. Uppertail-coverts, not seen.
  • 5. The pattern of the bill resembling to that of immature Glaucous Gull. The base is flesh-pinkish coloured with a black tip.
  • 6. No mirror(s) on outer primaries.
  • 7. Underwing; again, we did not see that today.
  • 8. most of the greater coverts are uniform dark brownish without any clear barring.
  • 9. T6 (r6) is completely dark, even the outer web.
reactie
From: Ies Meulmeester, Saturday 29 October 2011, 15:06
Unfortunately, a good try but no glory! It's a nice example of a look-a-like 2nd winter Smithsonian Gull. On of the best candidates we have seen the past years at Westkapelle. But definitively a 2nd winter European Herring Gull. The undertail-coverts must show more slightly denser and regular spaced bars. Also the vent is nearly complete unmarked which is very uncommon in 2nd winter smithsonianus at early autumn. And finally the brown colouration on the neck, chest and underparts is not uniform colored and show to much markings. Thanks to Peter Adriaens, Ruud Altenburg & Mars Muusse for their comments.
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