ID please-Is it a Glaucous-winged Gull? (3 Viewers)

[pandoo]

These photos were taken in Korea on March 8th.

In photo number 3, it is the one on the far right.
Is it a Glaucous-winged gull?

 

[lou salomon]

no, it's a 1st cycle Slaty-backed Gull. Juvenile feathers can get this bleached by early spring. However, since some hybrids Slaty-backed x Glaucous-winged are hanging around in that region I wouldn't be able to eliminate such a hybrid for this bird. Frosty wing tips are found in Slaty-backed too and the whitish greater covert panel is even typical of many spring 2cy Slaties.

 

[pandoo]

no, it's a 1st cycle Slaty-backed Gull. Juvenile feathers can get this bleached by early spring. However, since some hybrids Slaty-backed x Glaucous-winged are hanging around in that region I wouldn't be able to eliminate such a hybrid for this bird. Frosty wing tips are found in Slaty-backed too and the whitish greater covert panel is even typical of many spring 2cy Slaties.

It was a Slaty backed Gull! Thank you so much for always helping me🙏