I've hit a couple of them. Not much damage to my 1988 Jeep junker, but it does have a satisfying crunch.
Their just too stupid to move.
A little fishing line between posts has worked great for my father-in-law who lives on a lake. They get tired of tripping and falling on their beaks after a while.
For those who do manage to stay, they make great targets for the pellet gun...
We had some in my neighborhood. AWFUL animals.Crap everywhere, aggresive, the whole works. The most fun we had was chasing them down with a large remote control truck. They could not believe the truck wouldn't back dowm from thier attacks.