Squirrels, especially gray squirrels, are common throughout Minnesota but specifically the twin cities and the metro area. Squirrels are members of the rodent family and are highly arboreal. They tend to be very highly active in the summer and in the fall where they scavenge for food for the winter.
Tree squirrels generally nest in trees in wooded areas. Since Minnesota has a ton of wooded areas that we keep building into, it is forcing squirrels to look for alternative places to live and therefore housing structures are a great choice. The most common invaded areas are garages and attics. Squirrels reach these areas by chewing holes in the exterior of the structure and typically nest, store food or both. Their activity is usually noisy and heard by anyone in close proximity.