juvenile/1st winter
Heuglin's Gull Larus heuglini
December 2nd 2001 Choshi Chiba Japan

Vega Gull on the left, and Heuglin's Gull on the right.
Note how the Heuglin's Gull resembles Lesser Black-backed Gull well.

Another individual found at the same time (right) , and a 2nd winter Slaty-backed Gull (left). Note the smaller size, light-built structure, delicate smallish bill.

Its inner primaries do not form distinct 'window', though it is not completely dark. And a dark greater covert-bar is visible.

Right to left: Heuglin's Gull, Slaty-backed Gull, Vega Gull.