The same comic who created How to tell if your cat is plotting to kill you has a more recent post about how much cats actually kill. His observations stem from research done with attached cameras on house cats. The researchers found that one in three cats killed prey. Be sure to read the piece - it is really funny, in a scary way.
It has me wondering about Two though - will she be the one in three that is capable of killing? (Binx was.) The research seems to have followed house cats that were allowed to hunt outside, and I am curious what the numbers would be for indoor cats and their interactions with mice? Two hasn't experienced any mice yet because we don't have any at Rrunuv Bayit. Sometimes she tries to follow a small spider around but in general this apartment doesn't have mice, bugs or pests.
Casa Verde will be a different story though. We have found evidence of mice in the basement during our demo processes. So far we haven't seen any but with a house that old it will definitely be something we'll have to deal with at some point. I hope that Two is helpful but at the same time it is so awful to hear and find a cat's 'kill' that I almost wish that she would turn out to be the type to ignore them. Hopefully just her presence will be enough - all mice can just go find a cat-free house to live in.