Long ago, I saw evidence of mice getting into my basement. I learned never to put spring traps in out-of-the-way places, because they still trapped mice, but sometimes the doomed mouse would drag the trap somewhere, and I couldn’t stop the eventual smell if I couldn’t find the source.
I’d much rather prevent them from coming in the house than kill them – they can do an immense amount of damage – so first, I tried to find all the places that they used to enter. Mice can squeeze through incredibly small cracks and holes, so I checked the outside of the house carefully, even using a small mirror to peer under the siding where I couldn’t view directly. Couldn’t find any obvious entry places.
I engaged the services of a rodent exterminator, whose only game plan was to poison everything that moved. Not a good idea; I’m a nature-lover, up to a point, and didn’t want to poison foxes, birds, or neighbor’s dogs who got loose.
Then I surmised that there was only one interior crack that they used to gain entry to the basement. For the last few years, I have been putting multiple spring traps next to that spot. I catch 20-40 per season (my “mouse season” is from September to September, mostly in the winter, when they are seeking warmth).
Mouse carcasses may be useless to me, but a tasty snack for foxes and some birds (blue jays, crows), so I put the corpses on my rock wall. Perhaps they would have liked some ketchup or salsa with their meal, but I do have my limits.
After training video cameras on the “fox feeder” for hours, I have determined that they are indeed snatched up by the birds and foxes (birds in the daytime, foxes at night). I’m happy to help the local ecology this way. And my basement (and house) are quite free of micely destruction and tiny turds. A good solution all around.