Between hundreds of YL and Black-headed Gulls in Chioggia (Italy), two days ago, there was only one different bird: this one! I can't understand the age (transition from juvenile to 1st or 2nd winter?) and the legs are probably a bit too thick for a Caspian, but the "face" seems typical...
In the last pic, my bird is on the right: the left one is a Yellow-legged Gull
In the last pic, my bird is on the right: the left one is a Yellow-legged Gull