Common Rodents in London Ontario and How To Control Them

Knowing which rodent species are most likely to enter your London Ontario home is a critical part of effective rodent control in London. Different species behave differently, occupy different areas of the structure, and require different control approaches. Identifying what you are dealing with from the outset ensures the right strategy is applied from the start.

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The House Mouse

The house mouse is the most commonly encountered rodent in London Ontario residential properties across all neighbourhood types and housing ages. Small, agile, and highly adaptable, house mice can enter structures through gaps as small as six millimetres and establish nesting sites quickly in wall voids, insulation, cabinet spaces, and cluttered storage areas. They contaminate food storage areas and surfaces with droppings and urine, gnaw on structural materials and electrical wiring, and reproduce rapidly enough that a small initial intrusion can become a significant infestation within weeks. In London, house mice are found across the full range of the city’s housing stock, from the Victorian homes of Old East Village and Wortley Village to the post-war bungalows of Pond Mills and White Oaks and the newer subdivisions of Masonville and Hyde Park, and they are the most frequently encountered rodent species in residential rodent control calls throughout the year.

The Norway Rat

Norway rats are the most significant rat species in London Ontario and are directly linked to the Thames River corridor that runs through the heart of the city. Powerful burrowers and excellent swimmers, Norway rats establish burrow systems beneath foundations, along retaining walls, beneath concrete slabs, and in soil adjacent to structures, and they thrive in the waterway environment and storm and sanitary sewer infrastructure of London’s established urban core. Inside structures, Norway rats occupy the lowest levels including basements and crawl spaces, and their powerful gnawing causes serious damage to structural materials, plumbing, insulation, and electrical components. London properties near the Thames River in Byron, Wortley, Old North, Old East, and the downtown core face the most consistent Norway rat pressure in the city, but rat activity associated with the city’s sewer infrastructure extends into established residential communities well beyond the immediate river corridor.

The Deer Mouse

Deer mice are an important rodent concern for London properties in the city’s suburban and semi-rural northern and eastern areas, where residential development at London’s urban fringe interfaces directly with agricultural fields, woodlots, and natural areas where deer mouse populations are active and abundant. Deer mice are the primary reservoir host of hantavirus in Canada, and their presence inside residential structures carries a meaningful health risk that makes professional handling of deer mouse infestations strongly recommended over DIY approaches. Hantavirus can be transmitted through contact with deer mouse droppings, urine, or nesting material, or by inhaling airborne particles disturbed from contaminated areas. Deer mice are recognizable by their bicoloured colouring, with a brown back and white underside and feet, and they prefer nesting in undisturbed stored materials, insulation, and the secluded areas of basements, garages, and sheds. London communities including Lambeth, Komoka-adjacent areas, and the developing north end suburbs near Medway Creek and the Arva area face the highest deer mouse pressure in the city.

The Roof Rat

Roof rats are agile climbers that access structures from above using overhanging tree branches, utility lines, and rough exterior wall surfaces to reach rooflines, soffits, and attic vents. While Norway rats are far more prevalent in London, roof rats have been documented in various Ontario communities and may be encountered in London properties with mature tree canopy providing roof-level access and structures with deteriorated roofline features. Inside the structure, roof rats occupy attic spaces and upper wall voids rather than the ground and basement areas typical of Norway rats, meaning their activity is most often noticed through sounds in the ceiling and attic and through damage to attic insulation. When rat activity is suspected in any London property, professional identification is recommended before treatment begins, as the correct approach differs significantly between Norway and roof rat infestations.

The Meadow Vole

Meadow voles are stocky, short-tailed rodents that inhabit grassy areas, agricultural field edges, and naturalized ground cover adjacent to London properties, particularly in the city’s northern and eastern suburban communities at the urban fringe and near the naturalized valley edges of the Thames River and Medway Creek corridors. Voles travel through shallow surface runways in grass and ground cover and typically enter structures at ground level through gaps beneath door thresholds or in the foundation. Their presence is most notable in properties with adjacent garden areas, unmown grass, or dense low-growing vegetation near the foundation, and their entry into lower-level spaces is not uncommon in fall as outdoor conditions deteriorate. Control follows similar exclusion and trapping principles as house mice, with management of ground-level vegetation near the foundation playing a particularly important role in reducing ongoing vole pressure on London properties bordering natural and agricultural areas.

Professional Rodent Control for London Properties

Identifying the rodent species active on your property is essential to effective control, and accurate identification requires professional expertise. Mosquito Man provides rodent control in London Ontario that begins with a thorough inspection, assesses which species are contributing to the infestation, and applies targeted interior treatment and exterior exclusion measures designed to eliminate the active population and prevent reinfestation. Contact Mosquito Man today to schedule a professional assessment for your London property.