Slaty-backed Gull (schistisagus) / オオセグロカモメ / 큰재갈매기

(last update: December 2015)

Slaty-backed Gull (schistisagus) 2nd cycle (2CY), July 12 2004, Chukotka, Russian Federation. Picture: Tuomo Jaakkonen.

Active complete moult, moulting to 2nd cycle. Central GC and most LC, and lower tertials are old juvenile, worn and bleached to whitish. Old 2nd gen scaps also bleached. New MC brown-grey, new inner GC and inner LLC growing in. Old juvenile tail, outer primaries and secondaries bleached. Dark iris and dark bill. Tip of new P4 just visible.