Hate the damn things. Ground hogs up high on the list, too.
Well, I'm going to stand by my description of large, aggressive coons. Most are smaller and quieter, but I can assure you some are ready to fight and do not hiss like an opossum - if you have coon hunters around ask them...
But...you bring up another nemesis of mine - groundhogs. I have killed hundreds of them in my lifetime. To no avail...
True story...I have a separate mower shop at the farm from the main shop. I started in this building which had a dirt floor (which is honestly a great surface to work off of, hardened and soaked with oil and grease). Unless you have groundhogs. They continually undermined the shop floor (forget trying to put a jack down - you never knew when it would fall through into a groundhog run). A never ending fight.
I finally spent a lot of money on a monolithic concrete and rebar pour to simply stop the darn things from attacking the shop floor. And I did the pour and finish myself with a guy that worked with me. Still cost a lot. And...wait for it, I still trap and kill 3 or 4 from underneath that slab each year (in addition to the others that attack other buildings on the farm...). Jeez... But at least with 6-7 inches of concrete, they don't come inside (yet).
Hate them - have studied them (like Sun Tzu offered...know your enemy). Their runs go forever and are used over and over.
And I have also heard them squeal if shot placement is not spot on. Best way to get them is with a Conibear trap, but it is definitely a kill trap and is dangerous to pets and anything or anyone who messes with it.
But there is some satisfaction in finally dispatching one of them. They are simply bad news for foundations, cattle, horses, and even small tractors at speed.
Now, did I mention I really don't like groundhogs...