I've recently had a happy little family of mice move into my coop. They've made a nest under the waterer by the heater. Nice and toasty warm. Thing is, they've started to stink up the coop. I've chased them away multiple times and have had the cat(s) go after them. I have a live trap, which worked for awhile, (I caught about 20 of the little buggers!) but now in the cold winter months they won't set their little feet on the cold metal. H-E-L-P! what can I do to get rid of them?