Black-headed Gull (Chroicocephalus ridibundus) ユリカモメ
The Black-headed Gull has a black head during breeding season. The rest of the year it has a black spot behind the eye. Juveniles have more grey areas around the head. They have black tipped orange bills and orange legs. Fujisawa 2016
Black-headed Gull on the mooring chain of the Hikawa Maru. Yokohama 2013