In the winter our chickens will work their way to a stream 50 yds into the swamp than scratch their way along for a 100 yds down stream. They return at dusk via a logging road that comes into the back clearing of the property. When they are running late they hit the clearing and fly and run to the coop. Only once did they give me the slip that I could not locate them, but came strolling out of the woods at dusk. We are surrounded by miles of thick, thick woods and swamp. They also have ranged in among a large flock of wild turkeys who come by once or twice a wk. I think like alot of birds they may have that internal compass.