When I moved into my house I noticed some old bait stations from the previous owners up in the attic. I've lived here about 5 years and have never seen a mouse or mini turds anywhere in the house, only droppings in the attic. Well a few weeks ago I was outside and saw one shoot by and go through a gap between the trim and the brick around the garage. Since then I have caught 10-12 with a snap trap set right by that opening. Caught another 6-7 in the attic with snap traps, but then they kind of left those alone. Seem to be getting wise. I also set up a 5 gallon bucket in the attic with ramps and a "rolling log", but didn't have any takers.
I don't want to close the opening until I've gotten rid of them all but I have no idea how many are up there. If I've killed 15 does that mean there are 50 more or 500?