Are mice a threat in my coop? My hens free-range so they tend not to be in the coop during the day (not laying yet). A few times, I will go into the coop to clean out, refill water, check on things, etc and see a mouse or two duck for cover. Should I be concerned with mice? A couple of times I have seen the mice jump out of the nesting boxes (girls should start laying in December - just installed the nesting boxes 2 weeks ago, placed hay and faux eggs.)