Black-headed Gull, Chroicocephalus ridibundus, in winter plumage, Wildfowl and Wetlands Trust, Slimbridge, Gloucestershire, UK.

- Image ID: M1C1XF

Black-headed Gull, Chroicocephalus ridibundus, in winter plumage, Wildfowl and Wetlands Trust, Slimbridge, Gloucestershire, UK.

Chris Mattison / Alamy Stock Photo

Image ID: M1C1XF