I went to put the steaks and the asparagus into the broiler in the oven and the mouse scurried past me along the wall going from the radiator to the fridge. I startled the mouse and then it startled me. Then after I placed the food in the oven the mouse scurried back from behind the fridge to the radiator. I looked and found that the radiator doesn't have a cover ring after dismissing the idea that the family of mice lived behind the washer and dryer. My theory is that the mice travel through the building using the pipes for the radiators. I know the other hole they go through in the kitchen across the room. I'll have to seal both of these holes. It will be a good mission for me this weekend to investigate and accomplish this. But seeing the high quadraped rodent foot traffic in the kitchen has helped to spur Sarah and I to prioritize getting a cat ASAP.