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.

https://m.youtube.com/watch?v=xRPTBhmcyXY

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.