House mice in GTA homes

A house mouse is a small rodent with a pointed snout, large ears and droppings about the size of a grain of rice. In Greater Toronto Area homes they nest in wall voids, attics and behind appliances. They chew food packaging, insulation and wiring, and they fit through a gap about the width of a pencil.

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How to recognize it

Small, grey-brown body, pointed snout, large ears and a long thin tail
Droppings the size of a grain of rice, pointed at the ends, along baseboards and in cupboards
Scratching in walls or ceilings at night
A stale, musky smell in closed cupboards or the attic

What damage it causes

Chewed boxes, bread bags and stored food in the pantry
Gnawed electrical wiring, which is a fire risk
Torn insulation in attics and wall voids
Greasy rub marks along the paths they travel every night

Where it lives

Wall voids, attics and the space behind stoves and fridges
Basements and garages, especially once nights cool in fall
Gaps around pipes, vents and garage doors — a pencil-width opening is enough
Detached homes, townhouses and condos across Brampton, Mississauga and Toronto

Questions about house mice

How can I tell mouse droppings from rat droppings?

Mouse droppings are small, about the size of a grain of rice, and pointed. Rat droppings are larger, about 1 to 2 cm. A technician confirms which rodent it is at the inspection.

Where do mice nest in a house?

Usually somewhere warm and close to food: inside a wall, in the attic, or behind an appliance. Outdoor nesting in clutter or sheds is common before they move indoors in fall.

Common in these cities

Often confused with rats.

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