I read that somewhere too can't remember if it gets bad for them if too dirty or something makes it very dusty or molds can grow. there is so much info out there that at first it was mind boggling. I had chickens 20 years ago and we had no internet and did fine by the old fashioned trial and error. And there were some errors but once we got going I didn't loose a single chicken to predators or disease and some of the time they were free ranging. But I do have to admit that the wild animals are living alot closer to us now, not that I mind, only if they got some of my animals. lionpearl