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Pest Library
Common Pests in Ontario
Mosquitoes
Mosquitoes gather around standing water and shaded vegetation, where they rest and breed. You may notice them around shrubs, trees, and damp parts of the yard, especially during warmer months. Learn more about mosquitoes.
Rats
Rats may leave larger droppings, gnaw marks, burrows near foundations, or scratching sounds in walls and ceilings. They often travel along sheltered routes while searching for food and nesting sites. Learn more about rats.
Mice
Mice can enter through narrow gaps around foundations, doors, pipes, and vents. Signs of activity may include small droppings, gnaw marks, nesting material, or scratching sounds in walls and ceilings. Learn more about mice.
Spiders
Spiders may build webs in quiet corners, basements, garages, sheds, and around windows or eaves. Their presence can also point to areas where other insects are available as prey. Learn more about spiders.
Cockroaches
Cockroaches prefer warm, sheltered areas with access to food and moisture, including kitchens, bathrooms, and spaces behind appliances. Droppings, shed skins, egg cases, or nighttime sightings may indicate activity. Learn more about cockroaches.
Ticks
Ticks are often found in tall grass, leaf litter, and brushy areas. They can be difficult to spot on people or pets after time outdoors, so check carefully around clothing and skin. Learn more about ticks.
Ants
Ants may form visible trails as they search for food, entering through small gaps around doors, windows, and foundations. Nests can develop in soil, landscaping, or sheltered areas near a building. Learn more about ants.
Fleas
Fleas are small, fast-moving insects that may be found on pets, in carpets, or around upholstered furniture. Their presence can lead to repeated bites and itching, while eggs and larvae may remain hidden in fabrics and floor coverings. Learn more about fleas.
Wasps
Wasps may build nests under eaves, around soffits, in sheds, or in other sheltered spots near the home. Increased activity around one area can help reveal where a nest is located. Learn more about wasps.
Boxelder Bugs
Boxelder bugs often gather on sunny exterior walls and around windows. They may move indoors through small openings as temperatures change, appearing near windows, doors, or other bright areas. Learn more about boxelder bugs.
Centipedes
Centipedes are fast-moving pests with long bodies and many legs. They are often spotted in damp areas such as basements, bathrooms, and utility rooms, where other small insects may also be present. Learn more about centipedes.
Millipedes
Millipedes have long, rounded bodies with many short legs. They usually live outdoors in damp soil, leaf litter, and garden debris, but may wander indoors when conditions become too wet or dry. Learn more about millipedes.
Sowbugs
Sowbugs are small, gray, oval-shaped crustaceans often found beneath damp debris, flowerpots, or stones. Indoors, they tend to appear in moist areas such as basements and near ground-level doors. Learn more about sowbugs.
Silverfish
Silverfish are small, silvery insects with tapered bodies and quick movements. They prefer dark, humid spaces and may be found near stored paper, books, or fabrics. Learn more about silverfish.
Earwigs
Earwigs have narrow bodies and distinctive pincers at the rear. They hide in damp, sheltered places such as mulch, garden debris, and beneath pots, and may enter homes through gaps near doors. Learn more about earwigs.
Skunks
Skunks may dig in lawns and garden beds while searching for insects and grubs. They can also shelter beneath decks, sheds, or porches, where signs may include disturbed soil, tracks, or a strong odor. Learn more about skunks.
Raccoons
Raccoons are active at night and may investigate garbage bins, climb onto roofs, or seek shelter in attics and other protected spaces. Scratching sounds, disturbed bins, and roof damage can indicate activity. Learn more about raccoons.
