I have Ameraucana's, and one black giant hen. Any chicken can free range as long as you start them as day old chicks, they don't stray too far from their home. I had to move mine from the house to the chicken coop which is about 300' from the house, every night I had to carry them to the coop as they crowded around the house. I locked them in the coop for a week and now that is where they stay. I simply open the door in the morning and block it open, then at night they are all inside right before dark and I close the door and gather the eggs. No fence whatsoever they can fly away if they want but they won't. You have to watch predators, the worst being neighborhood dogs. My dogs are outside most of the time, that is enough to scare away predators. They are most vulnerable when they are 0-6 months old, after that they learn to roost up high and fight back. I raised a peacock the same way, he didn't fly away either. My neighbor leaves his chicken coop open, but it's located in with his goats and nothing bothers them. Murray McMurray sells chickens, ask them for a free catalog. The thing about free ranging birds is you have to really watch what you put on the grass, any pesticide or fertilizer you spray you'll be eating. It's fun raising chickens, and pretty easy. I made a heated waterer that hangs so winter isn't so bad.