Mice and voles, though small, can cause significant problems in our homes. Discover an exterminator’s advice to avoid them. When facing an infestation of these rodents, it’s crucial to understand their behavior and the best methods to control them effectively. On this page, we offer a range of practical advice and professional strategies, tailored to each type of rodent, from simple preventive measures to targeted professional extermination interventions. Understanding the importance of a pest-free environment, we are committed to offering you effective and lasting solutions for your mouse problems. Whether your goal is to treat an existing infestation or to take preventive measures, we are your trusted partner for expert and conscientious pest management.

Mouse near a window


Before proceeding with any treatment against rodents, it’s essential to properly identify the species involved. Mice, although common, can be confused with other rodents such as voles, shrews, or rats. Accurate identification is crucial as the type of treatment and inspection varies significantly depending on the species. Mice and rats, for example, differ not only in appearance but also in terms of behavior and traces left, such as droppings.



Mouse droppings are small, black, and pointed, measuring about 3 to 8 mm in length, often scattered randomly. In contrast, rat droppings are much larger, up to 20 mm, with a distinctive curved shape. The size and shape of the droppings are key indicators to distinguish these two species.

Physical Appearance

Mice are generally small with fur varying from grey to brown and white, and a long, thin tail. Rats are larger, with grayish-brown fur and a thicker tail. Voles resemble mice but can be distinguished by their brown fur with a white line on the belly, while shrews are smaller, with a pointed nose, dark brown fur, and small eyes and ears.

Behavior and Sounds

Mice make small scratching noises and the sound of their footsteps is light, indicating their mainly nocturnal presence. In contrast, rats scratch more fiercely and their footsteps are significantly heavier, reflecting their larger size. These sound differences are often a clear indicator of the type of rodent present.

Environment and Habits

Mice prefer areas close to food sources and can squeeze into spaces as small as a dime. Rats, being larger, require a larger space to pass through, comparable to the size of a quarter. As the saying goes: “If the head passes, the rest follows.”

These distinctions between appearance, behavior, sounds, and living habits are crucial for correctly identifying the rodent species and choosing the most suitable pest management treatment. Correct identification is essential for effective and preventive control of infestations.


Souris dans un pot
  • Description: Small, with gray, brown, or white fur, and a long, thin tail.
  • Size: 7 to 10 cm long (without the tail).
  • Droppings: Small, pointed, black, 3-8 mm.
  • Behavior: Nocturnal, high-pitched noises, active throughout the year.
  • Environment: Near food sources, residential and commercial buildings.


  • Description: Resemble mice, but with brown fur and a white line on the belly.
  • Size: 8 to 10 cm long (without the tail).
  • Droppings: Similar to mouse droppings, but slightly larger.
  • Behavior: Mainly nocturnal, avoid human interactions.
  • Environment: Wooded areas, fields, gardens.


  • Description: Small size, pointed nose, dark brown fur, small eyes and ears.
  • Size: 5 to 8 cm long (without the tail).
  • Droppings: Smaller and darker than mouse droppings.
  • Behavior: Solitary, very active, mainly nocturnal.
  • Environment: Forests, meadows, gardens.


Rat de Norvège
  • Description: Larger than mice, grayish-brown fur, thick tail.
  • Size: 15 to 20 cm long (without the tail).
  • Droppings: Large, banana-shaped, 10-20 mm.
  • Behavior: Nocturnal, deep and heavy noises, can be aggressive.
  • Environment: Basements, sewers, urban and rural areas.

HOW TO Prevent a Mouse Infestation Like an Exterminator

Preventing a mouse invasion is a crucial aspect of pest management. As an exterminator, it is essential to adopt a proactive approach, focusing not only on treating existing infestations but also on implementing measures to prevent future invasions. This section is divided into two parts, each addressing key strategies to protect your home from mice.


To effectively prevent a mouse invasion, it is essential to adopt an external protection approach. Here are key measures to secure the exterior of your home and thus prevent mice from entering inside:

Outdoor Organization and Cleaning

  • Elimination of Refuges: Keep the garden and surroundings of your home clean and clear. Avoid leaving piles of wood, leaf piles, or debris that can provide ideal hiding spots for mice.
  • Pruning Shrubs and Branches: Keep shrubs and branches well-trimmed, especially those close to the house, to prevent mice from using them as access paths.

Securing Entry Points

  • Sealing Openings: Carefully inspect foundations, exterior walls, and roofs. Seal cracks, holes, and openings with durable materials like metal, concrete, or mortar.
  • Ventilation Grilles: Ensure that ventilation openings are protected by fine but strong mesh to prevent mice from infiltrating.

Use of Rodenticide Stations

  • Strategic Installation: Place rodenticide stations in key areas around the house, such as near foundations, doors, and potential access routes. These stations should be robust, secure, and designed to withstand weather conditions.
  • Safety and Compliance: Use these stations in accordance with local regulations and ensure they are lockable to prevent accidental access by children or pets.

Control of Food Sources

  • Waste Management: Keep trash bins tightly closed and away from the house. Mice are attracted to food remnants, so good waste management can reduce their interest in your property.
  • Regular Cleaning: Ensure that outdoor areas, like patios and decks, are regularly cleaned and free from food remnants or crumbs.

By integrating these measures into your external maintenance routine, you can create an effective first line of defense against mouse invasions. This proactive approach helps to stop mice before they enter your home, thereby contributing to maintaining a safe and pest-free domestic environment.


To prevent mice from entering and settling in your home, it is crucial to make the indoor environment less attractive to them. Here are several effective strategies to achieve this:

Control of Food Access

  • Sealing Entry Points: Inspect and seal all possible entry points under sinks, near pantries, and other food storage areas. Use materials like steel wool, urethane, or silicone to block access.
  • Airtight Food Storage: Store food, especially cereals, grains, and pet foods, in airtight containers. This prevents mice from detecting and accessing food.

Installation of Mechanical Traps

  • Strategic Placement of Traps: Install mechanical traps in areas where mouse activity is suspected or confirmed, such as attics, basements, behind appliances, and in suspended ceilings.
  • Variety of Traps: Use different types of traps, such as spring traps, sticky traps, and live traps, to increase the chances of capture.

Waste Management and Cleaning

  • Well-Sealed Trash Cans: Ensure that all trash cans, both inside and outside, are well-sealed with airtight lids to not attract mice with food odors.
  • Regular Cleaning: Keep the kitchen and food storage areas clean. Crumbs and food debris should be cleaned up immediately to not attract mice.

Reduction of Nesting Areas

  • Decluttering: Reduce clutter in garages, basements, attics, and closets. A decluttered space leaves fewer places for mice to hide and build nests.
  • Inspection of Fabrics and Materials: Regularly check piles of laundry, stacks of newspapers, and other materials that could serve as nesting materials for mice.

By implementing these strategies, you can make your home much less attractive to mice, thus significantly reducing the risk of an infestation. These preventive measures are essential to maintain a safe and pest-free domestic environment.


When it comes to managing a mouse problem, the intervention of a quality exterminator is crucial to ensure an effective and lasting solution. A professional in pest management adopts a methodical approach, which begins with a detailed inspection and extends to post-intervention follow-up. This method encompasses precise identification of the infestation, judicious choice of treatments, and the implementation of customized prevention strategies. By understanding mouse behavior and using proven techniques, a competent exterminator not only ensures the immediate eradication of pests but also contributes to preventing their return, thus guaranteeing the safety and tranquility of the treated space. Do not hesitate to contact us if needed.


The initial inspection is a fundamental step in the process of treating a mouse infestation. It allows the exterminator to understand the extent of the problem and to plan a suitable treatment strategy. Here are the key aspects of this inspection:


  • Searching for Signs: The exterminator actively looks for signs of mouse presence, such as droppings, gnaw marks, grease marks left by the fur of mice along walls, and nests.
  • Damage Analysis: Identifying areas damaged by mice, such as gnawed cables or perforated food packaging, helps determine areas of intense activity.


  • Access and Nesting Points: The interior is inspected to identify potential entry points and nesting areas, including hidden spaces like behind appliances, under furniture, and in false ceilings.
  • Movement Route Analysis: Understanding the paths taken by mice inside helps to effectively target the placement of traps and baits.


  • External Entry Points: The exterminator examines foundations, roofs, windows, and doors to detect cracks or openings through which mice can infiltrate.
  • Conducive Environment: The presence of debris, dense vegetation, or other elements that can harbor or attract mice is assessed for prevention recommendations.


  • Customized Treatment Plan: From the information gathered during the inspection, the exterminator develops a tailored treatment plan, adapted to the specifics of the infestation and the property.
  • Preventive Advice: Recommendations are made to reduce the risks of reinfestation, such as modifying the external environment or sealing identified entry points.

This comprehensive initial inspection allows the exterminator to implement an effective strategy to control and eliminate the mouse infestation while providing the client with useful advice to prevent future intrusions.


Following a thorough initial inspection, the exterminator can provide specific recommendations, tailored to the particularities of each situation, to treat and prevent mouse infestations. These tips are essential for effective mouse management on the property.


  • Sealing Entry Points: It is advised to close all openings, cracks, or holes identified, using robust materials such as metal or mortar to prevent mice from entering.
  • Improving Building Tightness: Ensure that doors, windows, and other access points are well-sealed to block mouse access.


  • Elimination of Food Sources: Store food in airtight containers, regularly clean food preparation areas, and avoid leaving crumbs or leftovers exposed.
  • Reduction of Refuge Areas: Advise clearing storage areas, basements, and attics of any clutter that could serve as a nest for mice.


  • Installation of Protective Grilles: Install metal grilles on vents and openings to prevent mice from entering while maintaining good ventilation.
  • Restriction of Movement Paths: Recommend the use of repellents or physical barriers to limit mouse movements in and around the house.


  • Practical and Preventive Tips: Inform the client about mouse habits for better understanding of their behaviors and how to effectively prevent them.

By following these personalized recommendations, based on a thorough analysis of the client’s environment, it is possible to effectively manage mouse infestations and minimize the risks of recurrence. These tips help create an environment less conducive to mice, thus contributing to a long-term solution against these pests.


In treating mouse problems, a quality exterminator uses a variety of traps and baits, each with its specificities. Here is an overview of the tools and substances commonly used:


  • Mechanical Mouse Traps: These traditional devices use a spring mechanism to capture mice.
  • Sticky Mouse Traps: These traps use an adhesive surface to retain mice that walk on them.
  • Pro-Ketch: A type of multi-capture trap designed to catch several mice without using chemicals.


  • Contrac (registration 22239): A second-generation anticoagulant rodenticide, effective and with few cases of resistance. It can be used outdoors (except in certain cities) as its active ingredient is slightly weaker and takes longer to act (about 48-72 hours).
  • Decimax (registration 33334), Final (registration 25423), First Strike (registration 29503): These products are other examples of rodenticides used in mouse management. They cannot be used outdoors. They offer different concentrations and types of active ingredients, adapted to various situations. The active ingredient is very effective and can cause the death of a mouse in less than 24 hours.


  • Outdoor Bait Stations: Larger and more robust, designed for outdoor use.
  • Indoor Bait Stations: Smaller, suitable for indoor use, often in hidden or inaccessible places.

These tools and substances, when used correctly by a professional, offer an effective solution for controlling mouse populations. The exterminator chooses the most appropriate material based on the infestation, environment, and specific needs of the client.


The effective application of the material is a crucial step in treating mouse problems. A qualified exterminator must judiciously choose and place traps and rodenticides based on the environment and the nature of the infestation.


  • According to the Situation: The choice of traps (mechanical, sticky, Pro-Ketch) and rodenticides (such as Contrac, Decimax, Final, First Strike) depends on the intensity of the infestation, the environment (indoor/outdoor), and the client’s preferences.
  • Type of Bait: The type of bait is selected based on its proven effectiveness against mice in similar situations.


  • High Activity Areas: Traps are placed in areas where mouse activity is most evident, such as near walls, behind appliances, in attics, and basements.
  • Safe Access to Baits: Rodenticides are placed in places inaccessible to humans and pets but accessible to mice. This includes internal walls, ceilings, attics, and other hidden areas. They must be well identified and contain the registration numbers.


  • Use of Secure Bait Stations: Rodenticides are often placed in secure bait stations to minimize risks to non-targets.
  • Compliance with Safety Regulations: Safety guidelines and local regulations regarding the use of rodenticides and traps are strictly followed to ensure safe application.

The correct application of materials by an experienced exterminator is essential to effectively eliminate mice while ensuring the safety of the property’s occupants. This thoughtful approach ensures that the treatment is not only effective but also carried out in compliance with safety and health standards.


After installing traps and baits, follow-up is an important step to assess the effectiveness of the treatment. Here’s what a post-installation follow-up entails:


  • Checking Traps and Bait Stations: It is crucial to regularly check traps and bait stations to evaluate mouse activity and the effectiveness of the treatment.
  • Observation of Reduction Signs: The exterminator looks for evidence indicating a decrease in mouse activity, such as fewer movement traces or a reduction in signs of new damage.


  • Planning Visits: A return is generally necessary to assess the success of the initial treatment. However, the number of follow-up visits depends on the extent of the infestation and the effectiveness of the measures taken.
  • Caution Against Excessive Promises: It is important to beware of companies that promise a large number of returns from the start. A well-executed treatment can often be effective with a limited number of visits, and promises of multiple returns may indicate a lack of experience or confidence.


A detailed report is a key element of the service provided by a professional exterminator. This document contains crucial information about the treatment performed:


  • Work Performed: The report details the specific actions undertaken by the exterminator, including the types of traps and baits used, as well as their location.
  • Recommendations: It also includes recommendations for future preventive measures and tips for keeping the environment mouse-free.
  • Details on Pesticides Used: The report provides detailed information on the pesticides used, including their classification and any relevant safety measures.

The detailed report serves as a reference document for the client, providing a complete overview of the treatment and advice to avoid future mouse infestations. It also testifies to the transparency and professionalism of the exterminator. Please do not hesitate to contact us if needed.

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