BTW, my yard is pretty small--1/3 of an acre? In town. It's a nice chicken yard, though--lots of bugs and grass and veg. 100% fenced, 4 ft in the back (but really more than 4 ft when you consider all the vegetation on it), 6 ft wood all other sides.
A friend of mine who does not keep chickens asked us to take in a free-roaming neighborhood chciken who had adopted their family. They asked around first and no one claimed it. This chicken is very tame and sweet but has been out on its own for a while now. I know it was not ideal to bring it...