You can rule out Greater Black-backed on the shape and size of bill (much heavier on GBB). On the basis of the dark primaries with narrow white tips and fairly pale head I would put this as 1st winter Lesser Black-backed just beginning to show signs of moulting into into 2nd cal. year.
Jan might have other ideas!
(Immature gulls aren't difficult, just learn to look the other way!!)
Last edited by Colin Key; April 18th, 2008 at 05:29 PM. Reason: Spelling
I think I might to have to disagree with Colin. In my view they are perfectly normal 2cy Herring Gulls. Structure,short primary projection, pale barred scapulars in poore contrast to pale covert region where the greater covert bar is barred on a pale background (although some LBBG,s can look superficially similar in the greater covert area), though the tertial edges seems to lack any pale notching and further looks very blackish, which is probably a photographic effect.
Have a look at these Herrin Gulls and compare pattern:
Lack of good images of 2cy LBBG,s prevented me from showing examples at the moment.