I suspect the Weasel/Seagull was staged. I would appear the Seagull was unable to take off and what was the Weasel doing swimming in the lake or ocean? I know they can swim but they're not generally a water animal. At the end the Weasel looked like it was heading for the boat.
Wiki says; 
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				In Greek culture, a weasel near the house is a sign of bad luck, even evil, "especially if there is in the household a girl about to be married", since the animal (based on its Greek etymology) was thought to be an unhappy bride who was transformed into a weasel.
			
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 Well, no wonder they're so vicious.