Hello! I have two hens in my snowy back yard and they will not stay in their pen. They keep coming over to the back porch at night to sleep and leave a mess everywhere..my mom is threatening to get rid of them if I can't keep them in their pen! Right now we have a medium sized coop with about a 3 foot high fence surrounding it. I can't imagine any way for them to get under the fence, so they must be flying over. I clipped their wings however, so how can this be possible? Any tips on what i can do to keep them in their own area?