Hi lou,
Fist of all , I'm sorry for my English is bad.
Yellow-legged gull is quite a common species in our country. I have the opportunity to see all along the coastline and the lakes of our country. Caspian Gull seen in winter along the northern coast. Bird watchers can not be identified by the best.Observers need to develop themselves in gull identification in Turkey. This is why record numbers in the Caspian gull will be low.There are a small number of Armenian area. Steppe gull migration is hard to describe, although the possibility of passing the time I do not think was taken in recording. I am not ornithologist , I am an amateur birdwatchers.These are my own observations, I can transfer information to you.