オオカモメ Larus_marinus
Great black-backed gull (Larus marinus). The largest species of gull. Recognizable by its pink flesh colored legs and dark wings. It is not the only gull with this coloration however.

Sometimes mistakingly called "greatER black backed gull". Might be confused with the yellow legged lesser black backed gull (Larus fuscus) at a distance and where the feet aren't visible.
great black-backed gull