Also think this looks like a Caspian, head and bill structure/shape surely fits. However, greater coverts and tertial pattern, meaning the pale edge reaching the greater coverts, which it usually don´t in Caspian, Yellow-legged and LBBG, but there are exceptions. If correct in image, the white seemingly rather unmarked head is not bad for YLG, in Turkey this time of year. Yhe pattern on the edges of the scapularst doesn´t look typical for Caspian, (have seen some ),but it doe´s sometimes for YLG:
I´d say nothing for sure for the time being, inspite of the Caspian like head.
http://www.xs4all.nl/~daarruud/michahellis1u.html
http://www.helsinki.fi/~rauste/tre2004/html/C_IMG_43177.html
http://www.helsinki.fi/~rauste/tre2004/html/C_IMG_41765.html
http://www.helsinki.fi/~rauste/tre2004/html/C_IMG_45130.html
http://www.bongariliitto.fi/kuvat/11_Rantalinnut/11h_Lokit/larcac_20040803_tamper_rauvi/IMG_5113.jpg
http://www.bongariliitto.fi/kuvat/11_Rantalinnut/11h_Lokit/larcac_20040809_lahti_kuhpe/998P_a.jpg
JanJ[/QUOTE
I'm also in Turkey. Is this also an immature Caspian? I didn't see quite the spotting on the undertail coverts on Bob's bird as this one, but then his bird looked at little wet and ruffled there, so hard to tell. I have a couple of shots in flight, but they are not too good. In flight, this bird has a white rump, a dark band across the tail with a white edge on the end of the tail. I'd love to know what I'm seeing here. Seems I'm always in a new country without a field guide! DOH! Even if I had one, it may not do me much good as far as gulls are concerned. They're so confusing with all those changes. Hope you can tell me what this guy is.