I can't really call it free ranging, it's really just access to the rest of my fenced backyard, but when I leave the run door open, my girls do make their own choice. Agatha says "nope, no way, nohow". Harper says " well, maybe, just to here, uh, never mind." (here being 5 feet from the run door) Nevada (aka Miss Piggy) follows me around, saying, "say, do you have any mealworms?" So, yes, chickens can be happy in their run. Mine have plenty of room, things to do, and they obviously feel more secure in there. I certainly feel they are more secure.