It seems like every institution has turned its back on Science, which could very easily explain why the various birds live where they choose to live.
My wife puts out birdseed and as a result we get all kinds of birds, Cardinals, Blue Jays, Mockingbirds, Finches, Sparrows, Wrens, Doves and many others I can’t name. Yes we get crows and other blackbirds as well.
So if you put out free stuff, you get more diversity.................