Anyone know how to scare off flying marsh rats? AKA

Red Wing Blackbirds. I have one of these

Birds that moved into the marsh 10' away from the

sidewalk that leads from my apt to my car. Anytime you walk down it the little

Dive bombs you. I'm guessing it has eggs in there.
I want to get rid of it, but I would prefer to scare it off rather than kill it. Although it looks like it might make a decent snack.