40-65 cm – Dark brown
Wild mammal – Moderate risk
Groundhog
The woodchuck (Marmota monax), also known as the whistler, is a large rodent that burrows deep under foundations, terraces and stairs. Its burrows can weaken foundation structures and cause major damage to gardens and lawns. It hibernates from November to March.
§1Distinctive features
How to identify it
Large, stocky rodent, 40 to 65 cm long, with a short, bushy tail (15 cm). Dark brown coat, broad, flattened head. Can weigh up to 5 kg in autumn before hibernation.
§2Habitat
Where to find it
Digs its burrows on embankments, under house foundations, terraces, staircases and sheds. Prefers areas with dense vegetation nearby.
§3Reproduction
Lifecycle
Without intervention, an infestation can double in size in just a few weeks.
§4What to look out for
Signs of infestation
- Burrow entrance 10-15 cm in diameter under a structure
- Earth mound at burrow entrance
- Damage to plantations, vegetables and roots
- Visible galleries under foundations or terraces
§5Why act fast
Risks
- Galleries weaken foundations and structures
- Extensive damage to gardens and vegetable patches
- Terriers for other animals (skunks, foxes)
§6Prevention
How to avoid it
- Install a metal barrier buried 30 cm underground
- Protect vegetable gardens with suitable fencing
- Fill abandoned burrows before they are reoccupied
- Avoid unprotected slopes near foundations
§7Pro method
How MW works
Inspection
Home location and assessment.
Preparation
Customized plan – pre-intervention measurements.
Treatment
Locate main and satellite nests, treat with non-repellent baits.
Follow-up
Inspection visit – written guarantee.
§8We answer you
Frequently asked questions
How do I know if a groundhog is living under my patio?
Look for a burrow entrance about 10 cm in diameter with a mound of earth. Gnawing marks on plants are also characteristic.
Can it be captured and released elsewhere?
The capture and transport of woodchucks is regulated in Quebec. Contact a certified pest control professional.
Do groundhogs damage foundations?
Yes, its galleries can extend under the foundations and weaken the structure. Rapid intervention is important.
React quickly, sleep well.
The longer the infestation lasts, the more expensive it becomes.