Mice are smaller in stature than rats, are brownish grey, and the adults can grow to be almost 7 inches long. The females have about 5-6 young with 8 litters per year.
A substantial infestation can increase over a short period of time. Mice live outdoors, burrowing holes for shelter, and seek warmth inside dwellings in colder months where there is a source of food nearby. They can nest anywhere in a dwelling, and like rats, cause damage on structures, wiring, and food sources.
Mice are carriers for the tick. Lyme disease in Ontario is growing with increasing tick populations and is becoming a real concern in our society. They can be reservoirs for Lyme disease and the Hanta virus.