Bird Intelligence

In the last decade or so, there's been a resurgencei trying to understand bird intelligence. So on the scale of other animal intelligences that we know of, where would you place the most intelligent birds? I've studied bullfinches, which is a coleo, the antithesis of bran, a little song bird. And they also have tremendous intelligence. But their intelligence manifests itself in another way. Like ravens, corvids parrots, bullfinches form very long term, rigorous parbonds with their partners. i think what happens in when people have kept bulfinches in captiity, they can train them to sing fantastically complex tunes.