This isn't something I plan on doing, so please no bashing or negative comments. *Edited to Clarify* I have roughly 80 chickens, but they are in coops and runs during the day and free-range in the afternoon and evenings. I'm not asking about simple free-ranging... I mean having chickens without a run or pen or fencing whatsoever, just a coop to go into at night. I am just curious, since people have had chickens for thousands of years and I'm sure not all of them were in pens; how many people have a coop for their chickens to go into at night and then just let them out during the day, all day everyday? How does it work, do you lose a lot of birds? Do they get smarter/ heartier over time and "learn" to be more self sufficient? Do they revert to become more "wild"? Does it draw predators more than if your birds were fenced in? Any and all info would be great! Thanks!