"In the late 1960s we started to see these fences used by landowners who wanted to manage their deer, to keep overpopulated deer herds out," says Kirby Brown, the executive vice president of the Texas Wildlife Association, a group including hunters, landowners, and wild-life advocates. "It's not like out West here, where big game has to migrate to winter range, or travel some big distance to feed. The average home range of a whitetail here is about 640 acres, one square mile. So, in my opinion, high fences are not the issue here. The size of the enclosure does make a difference--it's not very sporting when you can see the fence on the other side."