These Pallas'/Great Black-headed Gulls (Ichthyaetus ichthyaetus) were photographed at Maagen Mikhael fish ponds, north of Tel Aviv, Israel, in mid-March, 1989:
Two 2CY birds - note the difference in the greater coverts:
In the image below, a 2CY Ichthyaetus has been cut/pasted next to a L. armenicus, for size comparison:
An adult-type among mostly L. armenicus (a couple of the gulls might be cachinnans or michahellis):
Either a "retarded" 4CY-type or "advanced" 3CY-type, in alternate plumage:
