Many, many, many of the hunting ranches in South Africa are huge. By that, I mean in excess of 25,000 acres. On a property of that size, you'll rarely, if ever see a fence. The reason for the fences are primarily twofold: first, it's a carry over from the old days, to prevent the spread of hoof and mouth disease. Second, the animals are the property of the landowner, and he's just trying to protect his investment from escaping to neighboring properties. If you visit a hunting ranch in South Africa during the calving season, you will see many newborn animals. A great many of the animals hunted on these huge farms were born there. Hunting these animals on large, fenced properties is in my opinion, just as challenging as hunting an unfenced one.