Slaty-backed Gull Larus schistisagus
Dec.4th 2008 Miura Kanagawa Japan
When no other gulls for comparison present, mantle of a Slaty-backed Gull can appear as if it were the same tone as that of Vega Gull. But the truth is that the mantle shade of this individual is obviously darker (9 or 10 of Kodak Gray Scale?) compared with surrounding Vega Gulls.
The same Slaty-backed Gull with a Vega Gulls in the foreground.
The Slaty-backed Gull with 4 Vega Gulls in the foreground. Note the diffrence of mantle shades in similar angles.
The 3rd winter with a 4th winter on the left.