I keep some rabbits in my chicken yard, which is actually an orchard. I do not have buried wire, but the rabbits do burrow. As a matter of fact, a recent litter was raised in a deep burrow successfully. My little pen is about 100 foot by maybe 40 feet or so, not too big. I also have many rabbits that free-range my farm, but they make burrows in the worst places. Yes, of course they are subject to predators and they are somewhat tame, but they don't fight too much, just scuffle until a pecking order is acheived. I would raise two males together though, if you plan to keep them together and if they fight you will need to seperate them. If fluffy bunny is a child's fav pet and there will be devastation if it comes up missing or is killed, I'd stick with an indoor cage. Otherwise, free-range bunnies are fine and I know several people who have great luck with this. I've had several litters in the coop, I put a wooden nest box there and they have done fine. It is a great way to raise meat rabbits for the freezer. HenZ