When someone says “Pest control,” mice are definitely one of the pests that comes to mind. These vermin infest homes all year round. With the colder upon us, this also unfortunately means rodent activity escalates. It is estimated that 21 million homes are invaded each year by these rodents. Mice carry diseases, and can cause major home damages that will cost a pretty penny if not taken care of by yourself or a mice exterminator. Here are a few not so fun facts about mice.
Discover Important Facts About Mice Pests
- TL;DR Summary
- 1. Mice make an entrance
- 2. Mice can sing
- 3. Mice have horrible eyesight
- 4. Mice carry diseases
- 5. Mice teeth never stop growing
- 6. Mice eating habits
- 7. Mice reproduce rapidly
- 8. What Attracts Mice to Homes & Preventing Mice
- 9. Mouse vs. Rat Comparison
Mouse Questions Answered
- What smells do mice hate?
- How to get rid of mice in walls?
- What do mice need to survive?
- Do cats eat mice?
- How to keep mice away?
- Are mice blind?
- How to keep mice out of your car?
- Do mice eat grass?
TL;DR – Quick Summary
- Mice are common household pests that can squeeze through tiny openings and quickly infest homes, especially during colder months.
- Mice reproduce rapidly, cause costly structural damage by constantly chewing, and can carry over 35 diseases that pose health risks to humans.
- Mice are nocturnal, rely heavily on smell and hearing, and eat frequently, nesting close to food sources.
- While strong scents or cats may temporarily deter them, effective control requires sealing entry points, removing food and moisture sources, and addressing infestations promptly—often with professional help to prevent rapid population growth and further damage.
1. Mice Make an Entrance
Mice can fit through a hole ¼ of an inch in size. Or, in more understandable terms, about the width of a pencil. Mice and rats have a collapsible skeleton, which makes it so they can fit through small openings. Unlike most mammals, their rib cages are able to flex and flatten. This in combination with their spines being far more flexible than any other mammal or pest that gets inside, makes them tricky to keep out. Which unfortunately means, unless holes can be sealed, they’ll find their way in to get access to your food, water, heat, and shelter.
2. Mice Can Sing
Though they might not make it to the stage of the talent show, mice are one of four mammals that sing. Besides whales, humans, and bats. Mice sing at such a high frequency, we are unable to hear it. Mice sing to find a mate, and when it is slowed down, it has a resemblance to songs. Their singing is separate from their regular high pitched chatter that people can hear. They communicate with each other through less high pitch squeaking.
3. Mice Have Horrible Eyesight & Are Colorblind
Ever heard the song “Three Blind Mice?” Mice’s eyes, like most rodents, don’t see well when it is bright. Mice see far better in dim light, and can navigate far better in the dark. Which explains why they are nocturnal. Which often means, they are harder to spot while invading your home. They leave behind evidence, but it is relatively rare to see one during the day. Mice produce 40-100 droppings a day, meaning they leave around 36,000 droppings per year. Mice also leave urine markings everywhere they visit. Mice are also colorblind, meaning they can’t see any red light. That being said, to make up for their poor eyesight, their other senses are terrific. To be more specific, their hearing is relied on heavily. Mice have ultrasonic hearing, and they can hear up to 90 kHz. In addition to their hearing, mice use their whiskers to sense textures and breezes, and sometimes even temperature changes. Mice are very aware of their surroundings, even though their eyes are not the best.
4. Mice Carry Diseases
Though it is a well known fact that mice are unsanitary creatures, it is not well known how many diseases mice can carry. Mice are known to carry more than 35 diseases worldwide. Some of the main rodent-borne illnesses in the US, include Lymphocytic choriomeningitis (LCM), which affects the membrane around the brain and spinal cord. Hantavirus pulmonary syndrome, which affects lung tissue and can lead to fluid flooding the lungs. Leptospirosis, which affects the kidney, brain, and liver, and causes major failure to each organ. Salmonellosis, which is just a fancy way of saying salmonella. And Tularemia, which can cause skin sores, inflamed eyes, sore throat, mouth sores, diarrhea, and pneumonia.
5. Mice Teeth Never Stop Growing
Mice, much like almost all their rodent cousins, have to take care of their teeth. Mice chew to keep their long teeth from growing too long. They chew on wood, flooring, and other hard surfaces to keep their teeth from becoming a hazard. Mice’s teeth grow 0.3 mm per day, and have to chew everyday, to keep up with it. Mice chew through furniture, wires, wood, cardboard, and lots of household materials. Not counting farms and other businesses, mice cause $20 billion dollars in damages per year to single family homes.
6. Mice Eating Habits – What Mice Eat
Mice are active creatures, and spend a lot of energy jumping, climbing, chewing, running, and fighting their way inside your home. As a result, mice need a lot of food to keep up with their busy lifestyle. Mice eat between 15-20 times a day, consuming around .15 grams per sitting. In total, mice eat 3-4 grams of food per day. Which means they leave behind a lot of droppings. Mice are omnivores, meaning they eat grains, fruits, seeds, and meat. Mice cause damage to crops and domestic gardens yearly. It is estimated around 30% of crops are destroyed by mice. Because they need to eat so often, and so much, mice build their nests within 10 or 30 feet from a food source.
7. Mice Reproduce Rapidly
One female mouse can produce as many as 10 litters per year. Given that each litter consists of 4-16 pups, the population grows very very quickly with the right resources available. Mice mature to reproductive age by 6 weeks of age. By that time, they will start having their own litters, which only increases the population even more. One pair of mice and a litter of pups, can produce as many as 8,000 mice in one year.
Informative Tables
8. What Attracts Mice to Homes & Preventing Mice
| Example | Prevention Tip |
|---|---|
| Crumbs, pet food | Store in airtight containers |
| Leaky pipes | Fix moisture issues |
| Wall voids, clutter | Declutter & seal gaps |
| Garage engines | Seal garage openings |
| Overgrown vegetation | Trim landscaping |
9. Mouse vs. Rat Comparison
| Feature | Mice | Rats |
|---|---|---|
| Size | Smaller (2–4 inches body length) | Larger (7–9 inches body length) |
| Entry Gap | Can fit through ¼ inch openings | Can fit through ½ inch openings |
| Droppings | Small, rice-shaped pellets | Larger, capsule-shaped droppings |
| Nesting Areas | Walls, attics, insulation | Basements, crawl spaces, sewers |
| Reproduction Speed | Very rapid | Rapid |
| Damage Risk | Chew wires, food contamination | Structural damage, pipe gnawing |
Contact Pest Control Professionals Today
Mice aren’t a pest that just runs their course. They are quick to reproduce and can take over your home and property. If you are seeing mice or evidence of mice, it is important to treat them soon. At Green Pest Management we have the professional mice exterminators that are here to get service to you as soon as possible. We want to help you have peace of mind throughout the seasons. Give us a call at (302) 777-2390 for a free quote.
Frequently Asked Questions About Mice
What smells do mice hate?
Mice rely heavily on their sense of smell to locate food and detect danger. Strong, concentrated scents can overwhelm their sensitive olfactory system and discourage them from nesting nearby. Common odors that tend to deter mice include peppermint oil, eucalyptus, clove oil, ammonia-like smells, and predator scents. However, scent-based deterrents are temporary solutions. They may reduce activity in small areas but will not eliminate an active infestation. For long-term prevention, odor deterrents should be combined with sealing entry points and removing food sources.
How to get rid of mice in walls?
Mice inside walls typically enter through small exterior gaps and build nests near insulation or wiring. To remove them properly, the first step is identifying entry points and sealing them after confirming activity. If scratching sounds, droppings persist, professional rodent control may be necessary to locate nesting areas and prevent structural damage. The key is removal plus exclusion—eliminating the mice and blocking future access.
What do mice need to survive?
Mice require food, water, and shelter to survive. Indoors, they thrive when they find consistent access to crumbs, stored food, pet food, garbage, or pantry goods. Even small moisture sources—such as condensation, leaky pipes, or pet bowls—can sustain them. Shelter is equally important. Wall voids, insulation, storage boxes, and clutter provide safe nesting areas. When these three needs are met, mice reproduce rapidly. Removing even one of these survival elements significantly reduces infestation risk.
Do cats eat mice?
Many cats have a natural hunting instinct and may chase or kill mice. However, not all cats will eat them, especially well-fed domestic cats. Some may simply play with captured rodents. While cats can reduce visible rodent activity, they are not a reliable standalone pest control method. Mice can reproduce faster than a single cat can eliminate them, and rodents often remain hidden in walls or ceilings where cats cannot reach.
How to keep mice away?
Keeping mice away requires a combination of sanitation and exclusion. Seal gaps as small as ¼ inch around foundations, utility lines, vents, and doors. Store food in airtight containers and remove clutter that can serve as nesting material. Trim vegetation away from the home’s exterior and reduce moisture buildup. Regularly inspect garages, basements, and attics for droppings or gnaw marks. Prevention works best when structural repairs and cleanliness are maintained consistently.
Are mice blind?
No, mice are not blind, but their eyesight is relatively weak compared to their other senses. They see better in low-light conditions and are adapted to nocturnal activity. Bright light can be uncomfortable for them. To compensate for limited vision, mice rely heavily on hearing, smell, and whisker sensitivity to detect movement, airflow, and obstacles. This sensory adaptation helps them navigate effectively in dark environments.
How to keep mice out of your car?
Cars provide mice warmth and shelter, especially during colder months. To reduce risk of mice entering your car, park in sealed garages when possible and avoid storing pet food or trash near parking areas. Regularly open the hood and inspect for nesting materials. Seal small garage entry gaps and consider rodent deterrent pouches placed under the hood. Starting vehicles regularly also helps discourage nesting, as vibration and activity disrupt their comfort.
Do mice eat grass?
Mice may eat grass, mice are omnivores and primarily prefer grains, seeds, fruits, and accessible food scraps. While grass is not a primary food source, they may nibble on tender shoots or roots when other food is limited. Outdoor mice are more likely to consume plant material than indoor mice, which prefer stored human food and easy calorie sources.
Mice: Related Scientific Articles
Centers for Disease Control and Prevention. (n.d.). Controlling wild rodent infestations
Centers for Disease Control and Prevention. (n.d.). Seal up: Preventing rodent entry
Centers for Disease Control and Prevention. (n.d.). Trap up: Removing rodents safely
Environmental Protection Agency. (n.d.). Identify and prevent rodent infestations
University of California Agriculture and Natural Resources. (n.d.). House mouse
University of California Agriculture and Natural Resources. (n.d.). Pest notes: House mouse