I live down in the Springfield, MO area ... When I bought this house a little over 3 years ago, I acquired a mouse in the house problem!
First night I set 4 traps, before I laid down to bed ... Snap, snap, snap, snap! I went and emptied, and reset, in the morning I had four more ... I'm a long distance truck driver gone for weeks ... Every time home, I empty the traps and reset .. worked on sealing up the cracks and openings ...
I knew from the house inspection I had a small 2' black snake (rat snake) in the crawl space which has direct connection to the basement, and has a concrete foundation around it ... I didn't know that there were more snakes ... Until ... One spring day I left the basement door open ... When I went to close it after a few hours ...
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I had quite a fight to get this 5'+ black rat snake out ... It wasn't happy and neither was I ...
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Another about 2' long ...
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In all, since I sealed up everything ... I pulled 7 snakes out ... Two were over 5' ... The 2' was the smallest ... They couldn't keep up with the mice, even with me helping ... !!! Mice weren't scared of the snakes!
I got 4 kittens ... No more mice in the house, and they catch the rats (and mice too!) out in the field ...
Our field/woods rats are not huge ...
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The rats are there because they have found a nice home ... They have shelter, food, and water . . . Make it not a nice home!