The house mouse spends much of the year inside a home. Your Michigan home provide the necessary ingredients for the mouse to flourish - shelter, food, water.
People often think that the house mouse is a problem during other cooler times of the year, but this is not the case.
The house mouse is an invasive species, and they are prolific.
During the summer, attic spaces can get uncomfortably hot. Mice may modify their territory and move into cooler areas such as basements. They may explore outside as there is more shelter such as mulch beds, shrubs, and grass. You may observe the occasional mouse while doing your flower gardening.
By maintaining your exterior bait stations, you can protect your home from these occasional intruders and preventing a population boom.