When i'm out hunting that's all you see is stone walls used for property lines built back several hundred years ago, Some of the best areas to hunt are right along a stonewall, If there is an opening in the wall, The deer will follow the wall and walk thru the opening, They will not jump the wall unless they have to or are being pushed, Also the red squirrels and chipmunks love them too as i have had a few run right across my shoulders before......lol