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Rock sparrow perhaps?
It's difficult to know what this is from this shot (if only it didn't have its head turned away!).
I think that it is a sparrow, but my money would be a a female House Sparrow (or perhaps the very similar Spanish Sparrow). If it was a Rock Sparrow I would expect some of the head markings to be visible - and perhaps some streaking on the underparts.
You're probably right. I was getting carried away by being in virtual Greece for a few minutes, I've never been to the real country!
Lat/Lng: 39.2093, 26.2207