Black-tailed Gull (crassirostris) / ウミネコ / 괭이갈매기

(last update: December 2015)

Black-tailed Gull (crassirostris) 1st cycle (1CY), October 11 2015, Chidiwa Unzen city, Nagasaki, Japan. Picture: Nobuo Fukushima.

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1CY bird with all the scapulars replaced for 2nd generation feathers. Tertials still juvenile, but several inner and central wing-coverts replaced as well. Post-juvenile moult included also some body feathers, especially the head and flanks. New 2nd gen body feathers are more grey, and are intermixed with the old brown juvenile body feathers.