Seagull control is easy and low-tech.  All you need to do is string up some 15 to 30 pound test fishing line over the area where you are trying to keep seagulls away.  This is a common technique used by resorts over their swimming pools/spas at beach resorts.  The reflection from the fishing line scares off birds.  Believe me, it really works!
				
			
			
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