Deer Mouse

Danger/Damage

Deer mice are structural pests, as they gnaw through wood and electrical wires causing terrible damage to properties. Deer mice are also known carriers for hantavirus, a virus that affects the respiratory system of humans.


Did you know?

Deer mice have a brownish upper, white feet and underside, and a bi-colored tail. Their eyes and ears are larger than those of house mice and are considered more “attractive”. They are structural pests as well as known carriers for hantavirus.


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Deer mice are grayish- brownish with a white underbelly and feet. The most interesting feature of deer mice is their bi-colored tail. They are commonly mistaken for other species of mice, but deer mice have a definite separation between the white underside and brownish upper. Their eyes and ears are larger than those of house mice and are considered more “attractive”.


Deer mice nest in safe locations close to food. They prefer to eat seeds, but they will also eat insects, slugs, snails, spiders, and millipedes. In properties, nests are built in basements, attics, storage areas, wall voids, sill plates, structural corners, and other tight spaces which offer shelter.

In the wild, nests are built around fence posts, in tree hollows, woodpiles, old and abandoned bird or squirrel nests, and beneath decks.

During the colder months, they frequently will enter structures such as sheds, homes, RV’s and other infrequently used vehicles.


The reproduction of deer mice is determined by the availability of food. When food is abundant, their reproduction rate can become quite high. If food is scarce, so is the reproduction rate. A female deer mouse will have two to four litters per year, averaging three to five young.

Deer mice will reach sexual maturity at seven to eight weeks. In properties, deer mice can live for as long as eight years but in the wild, due to lack of food, predation, and disease, they usually live up to two years.


  1. The name “deer mouse” comes from their color patterns. Deer mice are yellowish-brown with a white underbelly, and white legs, and bi-colored tails. Their colorations resemble that of the white-tailed deer.
  2. Deer mice are among the principal carriers of the virus that cause Hantavirus Pulmonary Syndrome. This illness is transmitted through their droppings and urine. People trying to clean in the same area where their urine and droppings are present can inhale the airborne virus.
  3. Deer mice are nocturnal being active at night.
  4. Common predators of deer mice include owls, snakes, skunks, foxes, and coyotes.

How long does a deer mouse live, and how often does it reproduce?

In properties, deer mice can live as long as eight years but in the wild, due to lack of food, predation, and disease, they usually live up to two years.

The reproduction of deer mice is determined by the availability of food. When food is abundant, their reproduction rate can become quite high. If food is scarce, so is the reproduction rate.

A female deer mouse will have two to four litters per year, averaging three to five young. Young house mice will reach sexual maturity at seven to eight weeks.

How does a deer mouse enter my home?

The deer mouse will enter a home or other property through any opening greater than 1/4 inch. Openings may be below/at ground level, or on roofs via chimneys and roof vents. They are capable of climbing trees, bricks, downspouts and they have tremendous jumping abilities.

How do I know if I have a deer mouse infestation?

If you live in a rural or semi-rural area, near a field, forest, or other undeveloped areas, you are more likely to have a deer mouse infestation.

Deer mice tend to be quite noisy as they will drum their paws at a speed so great that they sound like buzzing insects or humming electrical wires.

Deer mice will also build nests and stockpile food (mostly seeds and nuts) in out-of-the-way areas. These are strong indicators of a deer mouse infestation.

Chewing damage and droppings are not good indicators as all mice tend to do this.

Where will a deer mouse build its nest?

Deer mice nest in safe locations close to food. In properties, nests are built in basements, attics, storage areas, wall voids, sill plates, structural corners, and other tight spaces which offer shelter.

In the wild, nests are built around fence posts, in tree hollows, woodpiles, old and abandoned bird or squirrel nests, and beneath decks.

What does a deer mouse nest look like?

The deer mouse will build its nest from almost any material it can find. In properties, nests are built with paper, string, cloth, insulation, or any other materials which may be found inside the property.

In the wild, nests are built with grass and small sticks in a dome shape with only one entrance. In both environments, they can easily be mistaken as small piles.

If I see many nests, do I have many deer mice?

No. One deer mouse will have several nests. They have a habit of fouling their own nest, and consequently, are forced to leave and build or find another.

What can I do to prevent deer mice from entering my home?

To control or prevent infestation of deer mice, sealing up potential entry points, removal of food sources, rubbish, weeds within the surrounding area, and other potential nesting areas are essential.

Doors should also be equipped with tight-fitting door sweeps or weather-stripping and kept closed during their active time (early evening to pre-dawn).


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