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

(last update: December 2015)

Kim Seog-min (South Korea)
Hideo Shimura (Japan)
Peter Adriaens (Belgium)
Mars Muusse (Netherlands)

Slaty-backed Gull (schistisagus) 2nd cycle / 3CY January

2nd generation flight feathers.

After the complete moult in the summer months, some 2CY birds may start a subsequent limited moult in upper tertials and/or inner wing-coverts. In these birds, the new coverts (and new scapulars) often reflect the grey tone of adult plumage. The partial autumn moult took place in September-October, but the generation division is still obvious by January.

Slaty-backed Gull (schistisagus) 2nd cycle (3CY), January 02 2010, Choshi, Japan. Picture: Chris Gibbins.