Body is up to two inches in length.
This species has several closely related cousins that are colored similarly. All species are bicolored — the top is light brown to red-brown and the feet and underbelly are pure white.
Unlike the house mouse, the deer mouse is not found in cities but is associated more with rural areas and buildings located in or near wooded areas. It does not commonly invade homes, but in rare instances one or more deer mice may invade a particular building. The deer mouse is a medically important species because it carries the hantavirus. This virus can result in serious, often fatal, respiratory disease in humans. Cases of hantavirus are rare — only about 300-400 cases have been documented in the past nine years, and most have been in the Western United States. The hantavirus can be contracted in a number of ways: by handling dead, infected deer mouse carcasses; by breathing in mouse-urine-laden dust particles that contain the virus; or by inhaling dust from areas of accumulated deer mouse droppings. You should avoid any area where infected deer mice have frequented unless wearing proper protective gear.
Deer mice prefer the outdoors where they nest in tree holes, hollow logs, under logs and in piles of stones, branches or logs. If inside, they are most often found in areas of a home where the least human activity occurs, such as attics, garages, basements and crawl spaces.
If you live in an area where deer mice have been seen or could be present, it may be prudent and desirable to hire an experienced professional to control the mice. Proper precautions should be taken to minimize any possible health risk. Remember, the risk of actually encountering hantavirus-infected deer mice is very remote, but taking the following steps can minimize any potential risk: