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Viking Gull - Larus hypergentatus

Posted: Sun Sep 27, 2009 7:23 pm
by marsmuusse
There will always be a question whether to name it argentatus or hypergentatus.

Bird in Holland:
Image
on: http://www.gull-research.org/hypergenta ... tus01.html

Bird in Gotenborg:
Image
on: http://www.gull-research.org/hg/hg1cy/1cyaugust09.htm


References.
Harry Lehto - Finland:

http://users.utu.fi/hlehto/photo/gull/largxhyp.shtml

Mars

Re: Viking Gull - Larus hypergentatus

Posted: Sun Sep 27, 2009 8:00 pm
by marsmuusse
Norway, hyperboreus x argentatus can be found as south as S Norway (!);

http://cyberbirding.uib.no/gull/ind_ufo.php

Mars

Re: Viking Gull - Larus hypergentatus

Posted: Wed Oct 14, 2009 3:48 pm
by marsmuusse
I've just added a few images of the Viking Gull from IJmuiden, when it returned in its 2nd winter. Pictures are from Febr 2008, so bird in 3cy:

http://www.gull-research.org/hypergenta ... tus01.html

I also came across a few pictures which I feel could be used in this category. Its a 2cy (Febr 2008 as well) bird which I put in the books as the 'palest end of the spectrum' in argentatus. But of course its plumage may also be explained by 'at least some' influences from hyperboreus. Bird was photographed in IJmuide (Netherlands) as well...

Image

Image

Image

Image

Re: Viking Gull - Larus hypergentatus

Posted: Wed Oct 14, 2009 4:05 pm
by adriaens
See also this one, taken in foggy conditions:
http://picasaweb.google.be/Zorkyyy/Viking

Re: Viking Gull - Larus hypergentatus

Posted: Sun Oct 25, 2009 4:53 pm
by Ruud Altenburg
The bot-belly, short legs and 'facial expression' remind me of Glaucous. Also the primaries were paler brown. Or is it just the bill? Amsterdam, 25-10-09.

Re: Viking Gull - Larus hypergentatus

Posted: Sun Nov 01, 2009 2:33 pm
by Ruud Altenburg
One more Herring from the paler end, Heemskerk 31-10-09. Don't see any Glaucous influence here.

Re: Viking Gull - Larus hypergentatus

Posted: Tue Nov 03, 2009 1:33 pm
by Derek Charles
Hi agree that Ruuds gull does look to have a past history with a Glaucous!

Here are a mixture of "presumed" hybrids all from Ireland.

derek

Re: Viking Gull - Larus hypergentatus

Posted: Wed Jan 27, 2010 11:52 pm
by Spinus
Hi, two birds from Poland, both of theme have been seen in summer season.

Re: Viking Gull - Larus hypergentatus

Posted: Thu Jan 28, 2010 9:05 pm
by Theo Muusse
Nelson B1 and B2 may very well have a GBBG as a parent.

Theo

Re: Viking Gull - Larus hypergentatus

Posted: Sun Jan 31, 2010 7:36 pm
by Spinus
Thanks Theo for answer. This bird indeed doesn't looks like other "typical" hyperargentatus, but I have seen only few pictures of hybrid with GBBG.
Can you explain your presumption, is there any diagnostic details (bil, plumage pattern)?
Do you know any sites with pictures of hybrids?
One more pictures of this ineresting gull.