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Description
I took this photo almost 8 years ago, but I still don't know what kind of gull is this.

The photo was taken in Spain, Somewhere between Valencia and Barcelona, (Maybe near the "Delta of Ebro", I really don't remember) Sure was next to a marina, in the Mediterranean Sea, in summer, ending August, maybe between 25-30Th.

More photos: [link] [link]

I first though it was a Herring gull (Larus argentatus) because of the palid foot, but is still strange because this gull is from a higher latitude.
But I think isn't a yellow-legged gull (larus michahellis)
Maybe an Audoin's gull (Larus audoinii)? (Very common in this area)

Someone told me to think about an hybrid or a rare vagrant. Even a malformed Audoiini.

What do you think?

Description
I took this photo almost 8 years ago, but I still don't know what kind of gull is this.

The photo was taken in Spain, Somewhere between Valencia and Barcelona, (Maybe near the "Delta of Ebro", I really don't remember) Sure was next to a marina, in the Mediterranean Sea, in summer, ending August, maybe between 25-30Th.

More photos: [link] [link]

I first though it was a Herring gull (Larus argentatus) because of the palid foot, but is still strange because this gull is from a higher latitude.
But I think isn't a yellow-legged gull (larus michahellis)
Maybe an Audoin's gull (Larus audoinii)? (Very common in this area)

Someone told me to think about an hybrid or a rare vagrant. Even a malformed Audoiini.

What do you think?