Had a co-worker once who decided to help out a neighbor who had a groundhog nesting under the house. Took his pistol, and went on patrol one day. Got off a good shot, but didn't kill the bugger. It headed straight for it's burrow, where it soon expired. Let's just say he wasn't on speaking terms with the neighbor for a long while.
I was living in an apartment in the center of town, and a squirrel got in the attic. I informed the landlord, who being the cheapskate that he was, got some drunken maintenance man to get rid of it. He threw a bunch of poison in the attic, then patched over the entrance hole. For such a small animal, it sure made a big smell. I should have asked for double my deposit back when I moved out (luckily, I was at the end of the lease, but had to put up with the smell for a month). It was five months after I moved out before he was able to rent the place out again.
One night, I was at a girlfriends place out in the country, and she was talking about how beneficial her bats were, with all the mosquitos they ate. I asked her where the bat houses were, and she said they lived in the rafters of the house. So I sat on the deck after sundown, and counted at least 75 of the flying bug catchers emerging for their nightly feeding. Who knows how many dead ones were up there.
Then in this place, I had woodborer bees on the balcony. I just waited till the evening, and blasted one of the nest openings with some killer spray, and they came tumbling out of the other hole. One of them tried backing out, never making it completely, dying right in the entrance.
Animals think we exist to provide them with living space.
PF