The 4 Types of Pests in Toronto: Identification

In the Greater Toronto Area (GTA), our changing seasons and diverse landscape - from the dense Downtown to the ravines of North York and to the suburban stretches of Mississauga and Markham - create unique challenges for homeowners.

Pests are more than just a nuisance; they can damage your property, harm local biodiversity, and spread diseases. In Ontario, common pests generally fall into four categories: rodents, insects, birds, and urban wildlife.

1. Rodents (Mice and Rats)

Toronto is often ranked as one of the "rattiest" cities in Canada. As the temperature drops in the fall, Norway rats and house mice seek the warmth of GTA basements and crawl spaces.

Signs of an Infestation

• Droppings: Small, dark pellets found in cupboards or along baseboards.

• Gnaw Marks: Holes in food packaging, drywall, or electrical wiring (a major fire hazard).
• Nighttime Noises: Scratching or scurrying sounds within walls or ceilings.
• Smudge Marks: Dark grease marks along walls where rodents frequently travel.

2. Insects (Cockroaches, Bed Bugs,Wasps, and Ants)

Bed bugs and cockroaches are more common in the GTA due to high-density living. In the summer, Carpenter ants are a major concern for those near wooded areas. Greater Toronto Area's wasp season peak during mid July to August with increased sightings of eastern yellow jacket wasps on/around trees, on/around property (soffits and roof lines), and around/under ground.

Signs of an Infestation

• Sightings: Seeing more than one or two insects usually indicates a colony is nearby.
• Shed Skins: Cockroaches and bed bugs leave behind translucent "shells" as they grow.

• Fecal Spotting: Tiny black dots (similar to ground pepper) on walls or in mattress seams.

3. Birds (Pigeons and Starlings)

In urban areas like the Downtown core or Etobicoke, pigeons are the primary concern. Their acidic droppings can erode building materials and transit infrastructure.

Signs of an Infestation

• Concentrated Droppings: On balconies, window sills, or cars.
• Debris: Nesting materials (twigs and straw) blocking your gutters or HVAC vents.

4. Urban Wildlife (Raccoons, Skunks, and Squirrels)

Toronto is famously the "Raccoon Capital of the World". Our local wildlife is highly intelligent and has adapted perfectly to urban life.

Signs of an Infestation

• Structural Damage: Torn roof shingles or chewed soffits (common for squirrels).
• Garden Havoc: Overturned bins (garbage is most common for a food source) or dug-up lawns (often raccoons or skunks).
• Vocalizations: Heavy thumping or "chattering" within walls or the attic space.

If wildlife has been living in the attic for months, the attic may be contaminated with wildlife urine and feces. There are potential health risks to humans entering the contaminated space like roundworms from raccoons. From studying 1,539 raccoons, researchers found 35% of raccoon had roundworms. Roundworms can cause fever, abdimonal pain, band diarrhea.

Professional Help in the GTA

In Ontario, the use of pesticides and rodenticides is strictly regulated to protect our local environment and pets. If you suspect an infestation, it is often safer and more effective to call a licensed professional who understands Toronto’s specific bylaws and environmental standards with Integrated Pest Management (IPM) procedures.