Juvenile Black-headed Gull

Large ("L").

I had fun by the river this afternoon. The sky was bright and the black-headed gulls and greylags were on good form. I still haven't seen the leucistic Egyptian goose...

I've uploaded a couple of alternatives:
Geese, gulls, and gallivanters
&
"Wouldn't say boo to a..."

p.s. Yesterday, the picture was part of my synthesiser: a lot of you were very close (/spot on!), and the rest made me laugh (ha, I don't think that the UK Space Agency would look so high-tech...). I'll blip it more clearly another time.