Wow... It's not just that the hawk figured out a clever hunting tactic, it's how it did it: linking an auditory cue (the pedestrian signal) with a future visual scenario (a longer car line) and then using that cover to hunt. That's a level of abstraction and planning you don't usually associate with birds
You do associate those traits with birds in the raven family.
I figure the usual association with birds or perhaps animals in general is still mostly based on ‘humans smart; animals dumb’ instead of actual research.