Slaty-backed Gull Larus schistisagus
Dec.4th 2008 Miura Kanagawa Japan
The same Slaty-backed Gull in the foreground with a Vega Gull (left) and a 3rd winter Slaty-backed Gull in the background.
The Slaty-backed Gull with a Vega Gull in the background. Their mantle shades apparently look very close because of the different body angles.