I am Not Convinced.
If birds are so smart*, why aren't they hovering around Nordstrom's? Higher level cognition and WalMart seem mutually exclusive. Well, except for the fact that I shop at the bird infested WalMart. And sort of accepted the birds as part of the total shopping experience. People of been shopping in bird infested outdoor markets for centuries, right? So what's a few birds here and there? The health department thought otherwise.
(*Unconvincing evidence via First Things)