I had a pair of red foxes tunnel under my barn and connect their den with the adult woodchucks home on the back side entrance in 2011. Never knew which critter would pop out of the holes. The fat old woodchucks would even push the foxes out of the way. I'd hoped the foxes would encourage the woodchucks to leave, but no such luck. 2 adorable red kits, romping around just like kittens. Kits were fearless, out during the day and hard to keep secret from fearful neighbors. They left gifts of bunnie bits on the deck by the back door. Sadly they didn't come back last year. I've been checking the snow around the den, but no visitors so far.