Any bird who lives primarily in the water is dumb as shit. They have unlimited protection above and around them, so they have zero adaptive pressure to put anything into their intelligence. Land birds have a lot to worry about so their brains adapted near-human levels of intellect.

A land bird flew into my window so hard I was worried it died this morning. This happens once a month to my knowledge and I don’t spend long in my bedroom outside sleeping. Land birds aren’t smart outside of a few select species lol

In all seriousness that’s more of a sensory limitation than an intelligence limitation. IIRC birds’ eyes work differently from mammals and they can’t see glass pretty much at all.