We've known that peregrine falcons will often attack red tailed hawks. We've seen pictures of the attacks on Bobby, Violet and Rosie the hawks in Washington Square Park. Why do they do it? It seems to be for the sport of it. I don't think it's always a matter of protecting turf, as the story below discusses, because they'll often go after the hawks when they're in their own nests.
Below is a link to the full story with more incredible pictures of the falcon and owl, and the final outcome. Who wins? Click to find out. :)