have this coop http://cgi.ebay.com/BRAND-NEW-Rabbi...ps=63&clkid=294349870882858613#ht_2896wt_1141 and I am wondering if I need to insulate it? It seems to have good ventilation for the summer months but what about the winter? It is pretty cold here and it snows a lot! If I do need it what type should I use? I have images in my head of chickens eating insulation. I do not want to eat those eggs.