Pest Identification Guide
Learn to recognize the most common pests in Montreal. Click on a pest for its complete fact sheet: appearance, signs of infestation, risks and prevention tips.
Rodents

House Mouse
The house mouse is the most common rodent in Montreal homes. It can squeeze through openings as small as a dime.

Norway Rat
The Norway rat is a large rodent that colonizes basements and sewers in Montreal. Highly intelligent, it quickly adapts to control methods.
Insects

Bed Bug
The bed bug is a parasitic insect that feeds on human blood during sleep. Montreal is one of the most affected cities in Canada.

Cockroach
Cockroaches are extremely resilient nocturnal insects. They reproduce quickly and can infest an entire building within weeks.

Carpenter Ant
The carpenter ant excavates galleries in wood to establish its nest. It can cause significant structural damage to Montreal buildings.

Wasp
Wasps are aggressive flying insects that build their nests near homes. Their stings can cause severe allergic reactions.

House Fly
The house fly carries numerous bacteria. A fly infestation often indicates a hygiene issue or a source of decomposing organic matter.

Flea
Fleas are small parasitic insects that feed on the blood of pets and humans. They reproduce very quickly in carpets and bedding.

Carpet Beetle
Carpet beetles are small insects whose larvae feed on natural fibers, leather, wool and feathers. They cause significant damage to clothing and carpets.
Other pests

Spider
Spiders are generally harmless and useful as they eat other insects. However, a significant infestation often indicates the presence of other pests.

House Centipede
The house centipede is a common arthropod in Montreal basements. Although frightening in appearance, it is harmless and feeds on other harmful insects.

Woodlouse (Pill Bug)
Woodlice are terrestrial crustaceans that need moisture to survive. Their presence indoors indicates a moisture or water infiltration problem.
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