Deer Mouse
Peromyscus maniculatus
Also known as: White-Footed Deer Mouse
The Deer Mouse is the most abundant mammal in North America and the primary reservoir of Sin Nombre hantavirus, which causes hantavirus pulmonary syndrome (HPS), a potentially fatal respiratory disease. While primarily a rural and semi-rural species, deer mice frequently invade cabins, sheds, garages, and homes adjacent to natural areas during cold months.
Identification
Size
70-100 mm body length, plus 50-120 mm tail; 15-32 g
Color
Tawny brown to grayish-brown on top with a sharply contrasting white underside and white feet
Key Trait
Bicolored appearance with sharply defined brown upper body and white underside extending to the feet and the underside of the tail. Larger eyes and ears relative to body size than the house mouse.
Behavior & Habitat
Primarily nocturnal and semi-arboreal, readily climbing trees and vegetation. Stores large caches of seeds and nuts for winter. Does not hibernate and remains active year-round. Frequently enters structures in fall as temperatures drop, seeking warmth and food.
Habitat: Forests, grasslands, brushlands, and agricultural areas. Invades rural homes, cabins, sheds, barns, garages, and outbuildings. Nests in enclosed spaces using shredded materials.
Diet: Seeds, nuts, berries, insects, and fungi. Caches large quantities of seeds for winter use.
Signs of Infestation
- Small droppings (3-6 mm) in cabins, sheds, and garages, especially after periods of non-use
- Nests made of shredded paper, fabric, and plant material in drawers, storage boxes, and wall voids
- Seed caches found in boots, machinery, drawers, and other sheltered spaces
Risks & Damage
Primary reservoir of Sin Nombre hantavirus, which causes hantavirus pulmonary syndrome (HPS) with a 36% fatality rate. Virus is shed in urine, droppings, and saliva.
Prevention Tips
- 1.Seal all openings larger than 6 mm in cabins and outbuildings before winter
- 2.Store food in sealed containers and remove all food sources from unoccupied structures
- 3.Air out enclosed spaces for 30 minutes and wet down dusty areas with disinfectant before cleaning to avoid aerosolizing hantavirus
Why DIY Treatment Often Falls Short
Deer mice are abundant in natural areas and continuously reinvade structures from surrounding habitat. DIY cleanup of droppings without proper precautions risks hantavirus exposure through aerosolized particles. Exclusion of rural structures requires specialized knowledge.
Professional Treatment
Professionals conduct hantavirus-safe cleanup using respirators and EPA-registered disinfectants. Exclusion sealing, snap trap placement, and exterior bait stations are deployed. For seasonal properties, pre-winter exclusion and spring decontamination programs prevent annual reinfestations.
Frequently Asked Questions
How do I safely clean up deer mouse droppings?
How do I tell a deer mouse from a house mouse?
Is hantavirus only a concern in the western U.S.?
Need Help With Deer mouse?
If you're seeing signs of deer mouse in or around your home, professional treatment is the fastest way to stop the problem. Lotus Pest Control offers free inspections to identify the issue and recommend the right solution.
At a Glance
- Category
- Rodents
- Scientific Name
- Peromyscus maniculatus
- Size
- 70-100 mm body length, plus 50-120 mm tail; 15-32 g
- Color
- Tawny brown to grayish-brown on top with a sharply contrasting white underside and white feet
- Key Trait
- Bicolored appearance with sharply defined brown upper body and white underside extending to the feet and the underside of the tail. Larger eyes and ears relative to body size than the house mouse.
- Regions
- Mountain West, Southwest, Great Plains, Pacific Northwest, Midwest, West Coast, Northeast
- Threat Level
- High
- Risk Types
- health
- Seasonal Activity
- MarAprMayJunJulAugSepOctNovDecJanFebnonelowmoderatehighpeak