Latest Gulling on 2011 - an odd one!

I was focusing in the flock when a strange bird passed by:

A pic to show a typical primary pattern on YLG:

Several YLGs:

An immature Caspian with a very hooked bill:

Same bird from the other side:

And then the odd one appeared!

I think is a partly leucistic Heuglin's Gull:

Details shows a subadult:

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