www.gull-research.org

There will always be a question whether to name it argentatus or hypergentatus.

Bird in Holland:

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

Bird in Gotenborg:

on: http://www.gull-research.org/hg/hg1cy/1cyaugust09.htm


References.
Harry Lehto - Finland:

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

Mars

Norway, hyperboreus x argentatus can be found as south as S Norway (!);

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

Mars

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...

See also this one, taken in foggy conditions:
http://picasaweb.google.be/Zorkyyy/Viking

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.

One more Herring from the paler end, Heemskerk 31-10-09. Don't see any Glaucous influence here.

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

Hi, two birds from Poland, both of theme have been seen in summer season.

Nelson B1 and B2 may very well have a GBBG as a parent.

Theo

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.