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

(last update: December 2015)

Slaty-backed Gull (schistisagus) 3rd cycle (3CY), October 02 2007, Isohama, Tsuri-shihama, Japan. Picture: Shigenobu Aizawa.

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Last stage of complete moult, with P8 fully grown, P9-P10 growing. 3rd gen flight feathers: central primaries with bold white tips, lower tertials adult-like grey with extensive white tips, indicating the broad white trailing edge on the secondaries. Upperparts overall adult-like grey but still with obvious immature markings.