Went outside earlier today and found 2 cats sitting on top of my run. Thanks to reading all the advise from much wiser and more experienced BYC'ers I had covered the top of my run with a double layer of chicken wire even though I am in the middle of town. My 3 8 week old buff orpingtons were hunched up in a corner but the cats couldnt get to them. I popped off a couple of shots from a bb gun .......makes a nice sting but didnt kill them and not much chance of it going beyond my fence. Im going to pepper spray them if I see them again. Not really wanting to kill somebodies pet cat but am going to make them think twice about coming into my yard. Im sure glad I found such a good site with so much good advice. Thanks everybody my girlies appreciate it!