SlatybackedGulls_2 pale adults or hybrids_withGlaucouswingedGullsadGBBGull_Alaska Kamchatka_summer__24-10-2014_007.JPG
Birds 9 and 10 again, now compared to adult Glaucous-winged Gulls collected in Alaska and Kamchatka, and to adult Great Black-backed Gull (top left).
Collection of the Zoological Museum in Moscow, Russia.
