Albert de Jong
Larus cachinnans adult, June 28 2012, Baku landfill, Azerbaijan. Picture: Chris Gibbins.
This bird has rather a lot of black in the outer two primaries (black on P9 outerweb almost reaching primary coverts), and looked a fraction darker grey in the field. Steppe Gull (barabensis) should not be in Azerbaijan in summer; in field views it was not dark enough for barabensis, but tricky to judge this in the bright, sunny conditions. Of course much remains to be determined and it may be that barabensis is breeding in this area; a few 2CY birds that appeared to be this taxon were present at the landfill.
Long white tongue on underside of P10. Large mirrors on both P9 and P10.
Complete moult: P1/P4. PMS=6.