Yesterday while going to work, I noticed a couple of birds, one was on top of a telephone/power=line pole, while the second was flying by ans swooping down on the first. As I drove by I noticed the bird sitting on the pole was a Peregrine Falcon, and a Crow was flying by and diving at the Falcon. The Falcon wasn't flinching - just watching. I posted some images on my flicker account, and thy can be seen at:
Tempting Fate #1; #2 and #3.
I also took a hand held video of the action, and it can be seen at:
Crow Swooping by a Peregrine Falcon.