We used live traps to catch the mice. I didn’t have the heart to buy kill traps. It seems like hypocrisy to not eat animals because of ethics and then to turn around and kill them for happening to wander into my home.
If they were hurting or endangering us, sure, if killing is the only way, then so be it. But these were the cutest mice and their only harm was they ate a bag of walnuts we needed for a recipe. So they cost me some money and left some poop around, but nothing crazy.
The traps worked really well. We caught three mice in two nights and then released them in a field area near the outer limits of the city.