They are brave creatures. Not afraid of the cats, certainly not terribly afraid of us. And they dont seem to even notice the girls. But they are noticing the girls food in the run(And yes, I have begun not giving them treat in the run now.) But they sit on top of the run and chatter. My husband noticed one "digging" in the snow outside of the run trying to get in it. They cant since 1. The ground is frozen solid 2. I ran chicken wire all around the out side of the run, as a apron when we were building it and then buried it under dirt. Wanted to put it down 12" but the tree roots wouldnt allow that. There is also chicken wire UNDER to coop floor so nothing can dig under and up in there either. The girls do not free range(city chickens) and the run is completely dovered in hardware clothe. But I know how industrious the buggers can be. We have had them get into the house Do I have to worry about them hurting the girls "if" they somehow get into the run?