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Theo Muusse wrote:I see many straightforward herring gulls, a few uncertain from only one picture and just a few birds I would call 'pure' cachinnans.
The graellsii type is interesting, given the location, half way between graellsii and heuglini territory...

Theo

Theo, I disagree. Most seems to be Caspians.

Interested people can send my e-mails: klein_hro@web.de
We also will visit the famous hybrid-colonies in East-Germany.

Read the inscription from below.
..99 ?
In my view a Caspian Gull.

Great work, Boris. Would be helpfull, if you could sort your gallery by species and origin of rings.

All colonies in Lausitz are +/- mixed.
Gräbendorfer See (Reddern) is dominated by Caspians with some HG, Sedlitz mixed HG + CG.
YLG is in minority, >10%.
Many gulls in the colonies are hybrids, because they interbreed since 20 years.
But the number of pure CG is increasing.

A determination as chick mostly means nothing in these mixing colonies with hybridization. Best way is their identification later.

In the Lausitz are 2 large colonies with ringing-activity. Gräbendorfer See (Reddern) and Sedlitzer See. Gräbendorf is the younger one, founded by Caspians in the last 5 years. Sedlitz exist since over 20 years and is clearly mixed, also with some YLG as third component. Interbreeding is common. Unf...

Wing-tags will be lost or broken after a few years. In my opinion colour-rings are better for long-living species like gulls.

Single CG individuals were located also in Baltic German Herring Gull colonies nowadays, but unknown if they breed there yet. Lets discuss about it in 20 years...

Maybe around 300, many of them in mixed pairs. The biggest colony is the Gräbendorf Lake near Altdöbern (Reddern).