I have numerous mouse holes in the large garden where the chickens roam. I know they are mouse holes, because the little buggers fearlessly come out and look at me!!! I tried pouring large amounts of water with a hose down the holes, and it never seemed to fill up on some of them. Is it ok to leave these guys around? I remove all food at the end of the day. What kind of bad things could happen if I leave them alive (don't put out traps)?