A number of different methods for enhancing big game (particularly antelope) movement under, through, or over fences have been tried during the last 15-20 years. These methods have been variably successful under certain conditions. The structures of fence modifications involved, however, were (and are) frequently expensive, complicated and/or cumbersome. Most importantly, they affected a very small area. Raising or lowering one or more wires can be the most successful and efficient fence modification for big game passage during periods when livestock are not present. Adjustable wire fences can allow nearly total freedom of movement by big game through any desired length of fence. Fence maintenance problems caused by drifting snow or big game can be greatly reduced if not eliminated. Only the problem wires need be moved. All others can be fastened securely to the post. Depending on the wire fastener used, adjustment can be made nearly as fast as a person can walk.