Silver Gull Aerial Predation and gulls in Istanbul

["Tony Keene" <>]

I heard some forward-thinking souls proposed that gulls should be lumped as 
follows:
Big Gull;
Small Gull;
Ross' Gull.

Mind you, what are the chances of Armenian Gull in Istanbul? If it's any help, 
Yellow-legged, Caspian and Armenian Gulls have all been considered at various 
points as subspecies of the Herring Gull.
Cheers,

Tony