This is Reuben. Our mouse early alert system. Actually he is the early alert system for mice, squirrels, rabbits, birds, snakes, and most assuredly skunks. Also anyone walking a dog near the house.
He has chased off all the elephants, wolves, and buffalo from the area, but he still alerts to keep them all away.
If he begins to circle the storage building, it means he smells mice. I put out fresh traps.
He catches some as a snack. I get more with thumbs, technology and peanut butter.