Since there is videos of seagulls hunting pigeons iโd say they are pretty smart birds. They just dont give a fuck to pretend around people.
Just because an animal is territorial and good at killing does not mean itโs smart.
The approach is pretty smart though and it isnt standard seagull behaviour, so they are inventive. Also they are about the same size as pigeons.
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This entire argument is a joke. They are birds, not even mammals, what can apes know about bird-logic? Einstein said you cant judge a fish for how well it can climb a tree but our bias for human smarts remains. Judge a seagull in the context of a seagull and the result will be the same as for every single other species, some are smarter/dumber then others, all have their own strengths and weaknesses. A smart seagull is the one most consistently successful and healthy as a seagull.