Rodents
Deer Mouse
A native wild mouse with a white belly and feet that moves into cottages, sheds and rural homes in fall. It is the main carrier of hantavirus in Canada.
Quick facts
- Size
- 8–10 cm body, plus tail
- Colour
- Brown back, white belly and feet
- Active season
- Year-round; moves indoors in fall
- Where found
- Cottages, garages, sheds, rural homes
How to Identify
- Sandy-brown to grey-brown back with a sharply contrasting white belly and feet
- Large eyes and large ears
- Tail about as long as the body, dark on top and white underneath
Signs to Look For
- Small, dark, rice-sized droppings
- Shredded insulation, paper or fabric used for nests
- Stashes of seeds or nuts in drawers, boots or vehicles
- Scratching or gnawing sounds at night
Why It Matters
- Can carry hantavirus, spread through dust from droppings, urine and nesting material
- Contaminate food and stored belongings
- Chew wiring, insulation and vehicle components
Prevention Tips
- Seal gaps around foundations, vents and utility lines — mice fit through 6 mm openings
- Store bird seed, pet food and dry food in sealed containers
- Keep firewood and clutter away from the building
- Never sweep or vacuum droppings dry — wet them with disinfectant first and wear gloves
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