"It's easy enough to get the ground. Others have succeeded to some extent with red foxes, though at first they lost every one, for the cunning rascals burrowed under the fence; but a way was found to prevent that by digging down a yard, filling it with stones, and running a heavy wire mesh back several feet. Of course the foxes kept on burrowing along the fence, but seemed to lack sense enough to start in five feet back so as to avoid the obstruction. Their cunning has a limit, and beyond that they're as stupid as any animal."