Larus audouinii/L. marinus
Larus audouinii - Audouin's Gull, Goeland d'Audouin - 4 year age-cycle
Larus marinus - Great Black-backed Gull, Goeland marin - 4 year age-cycle
Larus marinus - Great Black-backed Gull, Goeland marin - 4 year age-cycle
L. audouinii 3rd-winter
Spain; L'Ampolla, Ebro delta 4/1/15. Outer primary coverts dark, no white mirror on P10.
Ref:
IMG 5284X
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