Not long after I became a Buddhist, I stopped killing spiders in my house. These days I take a sheet of paper, get the spider to crawl onto it, and then carry the spider outside, where I set it free. Flying insects are similarly relocated using the old hand-over-a-cup technique.
That said, I still kill ants with impunity. There’s no relocating ants. You arrive home to find your kitchen overrun with ants and there’s only one thing to do: Spray ‘em down with Windex and watch ‘em die by the thousands. Stupid ants.
I have much to learn before I could ever be a monk.