Mice are sometimes kept as pets or used to feed other pets.
When mice enter structures uninvited it becomes a problem. Mice can enter a structure as small as 1/4 of an inch, or about the size of your pinky finger. If their head fits the rest of their body will follow. Mice tend to freeze to death fairly easy so they need to stay indoors or close to a heat source to survive our winters. We tend to see a spike in activity as the temperature starts to drop around 50-60 degrees in the fall time of year. Then again on those odd New England thaw days in January and February where it’s 60 degrees again. Mice will find ways under doors, around or in dryer vents, near chimneys, up through the corner gap in siding and can even scale the side of a building to reach a second story or attic area.