Rodents
Roof Rat
A slender, agile climbing rat that nests high up in attics, roofs and trees. Uncommon in Northern Ontario, but it can arrive with shipped goods.
Quick facts
- Size
- 16–20 cm body, plus a longer tail
- Colour
- Dark brown to black, lighter belly
- Active season
- Year-round
- Where found
- Attics, upper floors, roof spaces, trees
How to Identify
- Slimmer and sleeker than a Norway rat, with large ears and a pointed snout
- Tail longer than its head and body
- Excellent climber — usually found above ground level
Signs to Look For
- Droppings about 1–1.5 cm long with pointed ends
- Noises in the attic or ceiling at night
- Grease marks along beams, pipes and wires
- Gnawed fruit, nuts or stored goods
Why It Matters
- Contaminate food and surfaces and can spread disease
- Chew wiring and insulation in attics
- Hard to reach once established in upper areas
Prevention Tips
- Trim tree branches and vines back at least 1 m from the roof
- Seal roof vents, soffits and openings around pipes
- Store food in sealed containers and keep attics free of clutter
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Deer Mouse
A native wild mouse with a white belly and feet that moves into cottages, sheds and rural homes in fall.
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House Mouse
The most common rodent in Ontario homes and businesses.
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Norway Rat
A large, heavy-bodied burrowing rat that lives close to food and water — often around garbage areas, basements and commercial properties.
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