I've had chickens for 3 years. Always let them day range. Bordered by woods, creek, pastures and fields. When penned in the woods, they will not leave the woods. Penned up in open yard, will not enter woods. First year lost roo to dog, 2 hens to raccoon/oposum. Lately a grey fox has found my chickens and has made off with 6. The area is perfect for ambushing chickens. Have to keep them all in now. I've seen them go pretty far. Never too far from home though. They know the area well and can always find home.