Black-headed gulls with various stages of 'black' heads

Black-headed gulls with various stages of 'black' heads

Observation - Black-headed gulls with various stages of 'black' heads. Description: A line of black-headed gulls at the Serpentine, Hyde Park. I was intrigued by the different stages of breeding plumage they were in.

A line of black-headed gulls at the Serpentine, Hyde Park. I was intrigued by the different stages of breeding plumage they were in.