When you have A or 1 woodchuck, you best realize that there are 2. A pair, no one moves onto your property alone. Then a few times a year, they have a litter, usually 4 babies, cute fuzzy little chits. Then before long, they are mature enough to reproduce, leaving the 4 babies, and momma/pappa, =6 + the 4 they each will have, and pretty soon Caddy Shack looks like a true story. (I think I'm living the caddy shack story right now)
9 bullets later, the buggers moved from one shed to under the other one! UGH.
One thing that happens to your yard with the critters living is your flower beds have just been emptied, and when you decide to trot along with dog, grand kid, or just go for a jog, that hole is the size of your foot and if your lucky enough to not break your leg, sprain your ankle, you will certainly loose your lung capacity when you abruptly stop and the wind will be knocked out of you!
Anyways, I hear that if you put amonia or used kitty litter down the hole it drives them out (would me too) also, what Maine farmers do is to back up the tractor /auto up to the hole, after placing a very heavy rock or board on the 2nd hole, use the vacume cleaner hose, taped to the exhaust pipe and drop the other end down hole #1. It is like the gas chamber and after running the vehicle for 10 min, you have just allowed them to go to sleep.
They are cute, in someone elses yard!