What kind of 'white bird' is this, please?

[John Latter]

Hiya,

I live in Dover and today I took a photo of this bird paddling in the River Dour:

I'm ok at telling seagulls from pigeons, but that's pretty close to the limits of my ornithological knowledge. Can anyone tell me what it is, please?

John Latter / Jorolat

Images of Dover | Dover Blog: The Psychology of a Small Town

[Kris Gibb]

This is an adult (winter) Black-headed Gull. Doesn't look to well!

Kris

[John Latter]

Originally Posted by Kris Gibb

This is an adult (winter) Black-headed Gull. Doesn't look to well!

Kris

Thank you very much, Kris, though its sad to read it may be poorly.

John Latter / Jorolat

Images of Dover | Dover Blog: The Psychology of a Small Town