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Actually, I can't imagine why someone would want to eat a gull in the first place. Birds that prey on marine organisms tend to have an unpleasant, fishy taste. This ought to apply as much to gulls as it does to cormorants or sea ducks.
Also, as a birder I am obliged to note that there many species of gull, with a variety of names, but there is no bird called a "seagull." Of course, there is such a thing as a Seagull.