I have tried all sorts of methods of keeping nature out of my fenced yard, and nothing has really been terribly effective.

I temporarily had luck reducing the amount of mole activity by treating the lawn with milky spore for the grubs but that was, as I said, temporary. I think they were also feeding on the worms and whatnot.

Then rabbits moved in and my greyhound caught and killed a 7-8lb gray rabbit. I blocked every possible way into the fenced-in area, and it appeared that the rabbits set up a nest just outside our backyard.

Which leads us to the fisher we now have hanging around the yard, no doubt feasting on the abundance of rabbits.

<hums the theme from the Lion King>

Have you tried calling a wildlife/pest control person? Can woodchucks be trapped and relocated?