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House Mouse

Danger/Damage

House mice are considered one of the major structural pests, causing serious economic loss and an unsanitary environment in infested properties.

They are also health hazards as they can carry numerous diseases affecting humans, such as salmonella bacteria (food poisoning), leptospirosis, and typhus, as well as parasites such as fleas, roundworms, and mites, through the contamination of food and close contact with humans.


Did you know?

Due to the small size of the house mouse, it’s adaptability and the fact it needs only small amounts of food and space, the house mouse can survive almost any environment and is considered one of the major structural pests, causing serious economic loss and an unsanitary environment in infested properties.


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House mice are dusty grey and can measure from 3 to 10.5 cm including the tail. They have large ears and small eyes. The tail of the house mice is usually the same length as their torso and head combined.


House mice nest in safe locations close to food, preferring spaces in double walls, above ceilings, underneath floors, and closed-in areas around counters.

They have a keen sense of touch, smell, and hearing, and can run, climb, jump and swim very well.

House mice eat almost the same food as humans, including cereals, seeds, fruits, and vegetables.

House mice can survive outdoors during the winter under certain conditions but generally move indoors when the weather gets cold.


A female mouse can have as many as eight litters per year, averaging five to six young each. Young house mice are born about 19 days after breeding and mature rapidly. By three months the young are independent and capable of reproduction. They live an average of one year.


  1. A female house mouse can give birth to a half dozen babies every three weeks and can produce up to 35 young per year. More than 1 litter may be present in the nest at one time!
  2. The house mouse is omnivorous and derives moisture from the food they eat.
  3. House mice are excellent climbers and can jump up to a foot high; however, they are colorblind and cannot see clearly beyond six inches.

Do house mice cause damage?

Yes. House mice cause extensive damage to properties such as houses, restaurants, and bakeries; any place where food is handled or stored.

They will gnaw through wood to gain entrance into buildings, destroy fabrics and leather goods to build a nest, and can cause fires by chewing through the insulation on electrical wires.

Are house mice hazardous to humans?

Yes. House mice contaminate food with their droppings and urine through which they can spread diseases such as salmonella bacteria (food poisoning), Leptospirosis, and typhus.

They can also carry parasites such as fleas, round worms, and mites.

When are house mice most common?

House mice are year-round pests. Activity and indoor migration increase, as the weather gets cooler.

When am I most likely to see house mice?

House mice become active primarily during the evening and remain so until the middle of the night. If food is scarce or the infestation is large, they will be active during the daytime.

Where do house mice build nests?

House mice nest in any safe location close to food, preferring spaces in double walls, above ceilings, underneath floors, and closed-in areas around counters.

How can I tell if I have an infestation of house mice?

There are several factors to look for. House mouse droppings near available food are the most common indication, but gnawed holes in bags and boxes containing food or garbage are also a sign of mouse activity.

Noises made by their running, gnawing, and scratching will also provide clues to their actual location.

How does a house mouse enter my home?

The house 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 can I prevent house mice from entering my home?

To control or prevent infestation of house 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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