Black-headed Gull

Black-headed Gull

Observation - Black-headed Gull - UK and Ireland. Description: One of a small number on river side - two had very dark heads, but the brown head-patch on others was much lighter in colour; similar to winter markings.

One of a small number on river side - two had very dark heads, but the brown head-patch on others was much lighter in colour; similar to winter markings.