I need to add curtains to at least a one of my wooden nest boxes pretty quickly since I have two pullets who are becoming increasingly fixated on wanting to get into very dark nooks rather than going into my mostly-open-front nest boxes. 7 hens and 5 other pullets are happy with my nest box designs so I don't think it's a design issue with the boxes outside of not being a private enough space. I have a small bit of spare cotton cloth somwhere but I think they'll just shred it and eat the fibers over time since it's not very good quality material. Haven't found references to what materials to use in a quick search. Would some kind of non-fuzzy dish towel type thing do the job without getting eaten? Or does it need to be some kind of a soft plastic to not get shredded over time?