Atypical Gull (caspian?) (1 Viewer)

[Michał Jaro]

Hello
Me with the gull again
Despite my best efforts, I haven't found Caspian Gull with this pattern on primaries anywhere - P10 and P9 have the same, all white tips. The pattern of these feathers looks even weirder from underside. What's more - I haven't found such a large Gull at all. Is this an aberration or is it due to individual variability? Or is it some other Gull?
Poland end of December.

 

[lou salomon]

Yes, that's a Caspian Gull with thayeri-pattern on p10 and a reduced p5 mark.

 

[Michał Jaro]

Thayeri pattern? - I didn't know about such a thing.
I guess it's rare, I don't remember it in "my" Caspians.
Thank you so much Lou !

 

[lou salomon]

no, not really rare. but both in one bird are not common.
thayeri-pattern refers to the white of p10 tip (mirror) being connected to the white tongue on underside of the feather.

 

[Michał Jaro]

Yes, I know, after the words "thayeri-pattern" I managed to find something on the Internet
Once again, many thanks!