Mice
The house mouse (Mus musculus) is a small rodent that normally lives outdoors and moves into homes, condos, restaurants and warehouses looking for food and shelter. It can squeeze through a crack about 1/4 inch wide and a female can have up to 8 litters a year, so a single mouse in a South Florida kitchen is often a sign that more are hiding in the walls.
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What Are House Mice?
The house mouse, Mus musculus, is a small rodent that has followed people around the world. University of Florida rodent control guidance explains that house mice normally live outdoors, in fields and overgrown areas, and occasionally move into buildings. Once inside, they live behind walls, in cabinets and in furniture, close to the food they eat.
In South Florida, mice share the job of “rodent problem” with the roof rat, which UF/IFAS describes as Florida’s most abundant and damaging rodent pest. The two animals cause different problems. Roof rats usually live up high, in attics, palms and trees. Mice usually live low and inside: in kitchen cabinets, under appliances, in wall voids, in garages and in stored boxes. Knowing which one you have matters, because traps, bait placement and exclusion work differently for each.
Our climate keeps mice comfortable year-round. There is no freezing winter to push them in or kill them off, and fields, vacant lots and overgrown landscaping next to homes and businesses give them a steady outdoor population. Heavy rains and hurricane flooding can push rodents out of their outdoor nests and toward buildings. From Hialeah apartment buildings to Doral warehouses and Miami Beach restaurants, any building with food and small gaps can end up with mice.
How to Identify House Mice
House mice are small, slender rodents with a thin tail about as long as the body.
- Color: Brown to gray.
- Size: Adults weigh only about 1/2 ounce. The tail is about as long as the body.
- Droppings: About 1/8 inch long and rod shaped, scattered wherever mice travel and feed.
- Behavior: Curious and active mainly at night.
Mouse vs. Roof Rat
The look-alike in South Florida is a young roof rat. An adult roof rat, Rattus rattus, is 12 to 14 inches long including the tail and weighs 5 to 10 ounces, about 10 to 20 times more than a mouse. Its droppings are up to 1/2 inch long, roughly four times longer than a mouse dropping. Roof rats are cautious and avoid new objects, while mice are curious and investigate them right away. If the noises are in the attic and you find large droppings, read our roof rat guide.
Mouse vs. Native Rodents
Florida also has native rodents such as the hispid cotton rat, Sigmodon hispidus, which the Florida Department of Health describes as common in residential areas throughout the state. Because the cotton rat is the rodent linked to hantavirus in Florida, it is worth knowing which rodent you have. If you find a rodent and are not sure what it is, a professional identification is the first step.
Life Cycle and Behavior
House mice multiply quickly. According to UF/IFAS, they reach sexual maturity in about 6 weeks and have 5 to 6 young per litter and up to 8 litters a year. They live about a year. In a warm building with steady food, that pace means a pair of mice can grow into a large infestation in just a few months.
Mice prefer grains but eat a wide variety of foods. They need very little: about 1/10 ounce of food and 1/20 ounce of water a day, and they can survive on food alone if it is moist enough. That is why a pantry, a cabinet or a stack of stored products can support mice for a long time.
Mice stay close to home. UF/IFAS notes that they often range only 10 to 30 feet from their nest. They build nests from soft material such as paper, fabric and insulation, usually in hidden, quiet places like wall voids, behind appliances, inside furniture and in boxes.
Unlike rats, mice are curious. They usually explore a new trap the first night it is set, so trap placement matters more than bait.
Signs of a Mouse Problem
- Small, dark, rod-shaped droppings about 1/8 inch long in drawers, cabinets, pantries and under sinks
- Gnawed food packages, cereal boxes, pet food bags or bird seed
- Shredded paper, fabric or insulation used as nest material
- Scratching or squeaking in walls, cabinets or ceilings, mostly at night
- Fresh gnaw marks on wood, which are light colored with sharp edges; old marks are smooth and darker
- Dark, greasy rub marks along baseboards and around openings
- Urine streaks along travel routes, which glow blue-white under ultraviolet light when fresh
- Tiny tracks in dust or on dusty shelves
Why Mice Are a Problem
Contamination. Mice leave droppings and urine wherever they travel, including countertops, food packages and dishes. University of Florida rodent control guidance notes that rats and mice together can carry at least 10 diseases, including leptospirosis, ratbite fever and bacterial food poisoning. Restaurants, food plants and warehouses also risk failed health inspections and product losses.
Damage. Mice gnaw constantly. They chew through food packaging, stored goods, insulation, furniture and electrical wiring, and they shred paper and fabric for nests.
Hantavirus facts for Florida. Many people search for hantavirus when they find mice. According to the CDC, the hantaviruses known to cause hantavirus pulmonary syndrome in the United States are carried by native New World rodents such as deer mice, white-footed mice, cotton rats and rice rats, and the house mouse is not listed among those hosts. In Florida, the Department of Health links hantavirus to the cotton rat, which carries Black Creek Canal virus and is common in residential areas, and describes one case, a south Dade County resident hospitalized in 1993. Because you cannot tell which rodent left droppings just by looking, the CDC recommends avoiding contact with all wild rats and mice and cleaning up carefully.
Cleaning up after mice. The CDC recommends wearing gloves, soaking droppings, urine and nests with a disinfectant or bleach solution before touching them, wiping them up with paper towels, and then disinfecting floors and counters. Do not sweep or vacuum droppings dry, because that can put contaminated dust into the air.
Where Mice Hide in South Florida Homes and Businesses
- Kitchens. Under and behind the stove, refrigerator and dishwasher, inside cabinets and the pantry.
- Wall voids. Mice travel inside walls along pipes and wiring, especially in apartments and condos.
- Garages and storage rooms. Stored boxes, bags of pet food, bird seed and clutter.
- Furniture. Inside couches, cabinets and drawers that are not used often.
- Laundry and utility areas. Around the water heater, washer and air handler closets.
- Condos and apartments. Mice move between units through shared walls, plumbing chases and trash rooms, so building-wide service through property management works better than treating one unit.
- Businesses. Warehouses, stockrooms, restaurants and food storage areas, where pallets and stored goods provide shelter. See our commercial services and food service programs.
When Mice Are Most Active in South Florida
| Season | Mouse activity | What to do |
|---|---|---|
| Year-round | House mice can breed all year in warm buildings with food | Check cabinets, pantries and garages regularly for droppings. |
| May to October (rainy season) | Heavy rain and flooding can push rodents out of outdoor nests and toward buildings | Seal gaps around doors, pipes and utility lines and clear debris near the house. |
| June to November (hurricane season) | Storm damage opens new gaps; displaced rodents look for shelter | Inspect doors, garage seals and exterior walls after every storm. |
| November to April (dry season) | Mice keep breeding indoors; stored items in garages and closets give them nesting spots | Store food and seasonal items in sealed plastic bins, not cardboard boxes. |
How to Prevent Mice
- Seal small gaps. Close every opening of 1/4 inch or more. UF/IFAS recommends rodent-resistant materials such as heavy sheet metal, hardware cloth with openings no larger than 1/4 inch, or concrete. Check under doors, around pipes under sinks, where cables and air conditioning lines enter and around garage doors.
- Install door sweeps on exterior doors and keep garage door seals in good condition.
- Store food in sealed containers. Use glass, metal or heavy plastic containers for cereal, grains, pet food and bird seed.
- Clean up crumbs and spills every day, including under appliances and in the pantry.
- Do not leave pet food out overnight.
- Reduce clutter. Replace cardboard boxes with sealed plastic bins and keep storage off the floor.
- Manage the outside. Keep vegetation trimmed back from the walls and remove debris and stacked materials near the building.
- Fix leaks under sinks and around appliances.
How Toro Gets Rid of Mice
- InspectionA Toro technician inspects the kitchen, walls, garage, attic and exterior to find droppings, nests, travel routes and every gap mice use to get in.
- Identification and planWe confirm whether you have house mice or rats, because each needs a different setup, and explain what is attracting them and what needs to change.
- Exclusion and targeted removalOur rodent control service seals entry points with rodent-resistant materials and places trapping and monitoring within the short range where mice travel.
- Follow-upWe return to check results, look for new activity and confirm that the openings stay sealed. If the mice come back, so will Toro, at no additional cost to you.
Toro Pest Management has protected South Florida since 1969 and serves homes and businesses across Miami-Dade, Broward, Palm Beach and the Keys, including Hialeah, Miami Beach, Hollywood and West Palm Beach. We respond within 24 hours, guaranteed, the first inspection is free and new customers get $25 off the first service. Call 305-594-4767. Hablamos Español.
Seeing signs of house mice? Get a free inspection and $25 off your first service.
Schedule Your Free InspectionHouse mice: Frequently Asked Questions
How do I know if I have mice?
The most common sign is droppings: tiny, dark, rod-shaped pellets about 1/8 inch long in drawers, cabinets, under sinks or along walls. You may also see gnawed food packages, shredded paper or fabric used as nest material, small greasy marks along baseboards, and hear scratching in walls at night. Fresh droppings are shiny and soft; old ones are gray and crumbly.
How small a hole can a mouse get through?
University of Florida rodent control guidance says house mice can squeeze through cracks about 1/4 inch wide, and adds a simple rule: any place a pencil can be poked, a mouse can go. That includes gaps under doors, around pipes under sinks, where air conditioning lines and cables enter the wall, and around garage doors.
What is the difference between a mouse and a rat?
Size is the easiest clue. An adult house mouse weighs about 1/2 ounce, while an adult roof rat weighs 5 to 10 ounces and is 12 to 14 inches long including the tail. Mouse droppings are about 1/8 inch long; roof rat droppings are up to 1/2 inch. In South Florida, noises in the attic are more often roof rats, while mice are usually found in walls, cabinets and furniture.
Do mice in Florida carry hantavirus?
The CDC states that the hantaviruses that cause hantavirus pulmonary syndrome in the United States are carried by native rodents such as deer mice, cotton rats and rice rats; house mice are not listed among those hosts. In Florida, the Department of Health links hantavirus to the cotton rat and describes one case, in south Dade County in 1993. House mice can still contaminate food and surfaces, so clean up droppings carefully.
How do I clean up mouse droppings?
CDC guidance recommends wearing rubber, latex, vinyl or nitrile gloves and never sweeping or vacuuming droppings dry, which can stir up dust. Soak droppings, urine and nest material with a disinfectant or bleach solution first, pick them up with paper towels, put them in the trash, and then disinfect the area, including floors, countertops and cabinets.
Can I get rid of mice myself?
Sometimes. Mice are curious and often go to traps the first night, and UF/IFAS notes that if you have not caught a mouse in the first few nights, the trap is in the wrong place. Because mice stay within 10 to 30 feet of their nest, a home needs more traps for mice than for rats. If mice keep returning, the entry points have not been found and sealed.
What attracts mice to a house?
Food, water and shelter. Mice prefer grains but eat almost anything, including pet food, bird seed, cereal and crumbs. They need very little water and can survive on moist food alone. Clutter, stored boxes and crowded garages give them places to nest, and gaps around doors, pipes and utility lines let them in.
Related Pests
Pest Control Across South Florida
Toro treats house mice in homes and businesses throughout Miami-Dade, Broward and Palm Beach counties, including:
- Miami
- Hialeah
- Doral
- Miami Beach
- Coral Gables
- Homestead
- Fort Lauderdale
- Hollywood
- Pembroke Pines
- Miramar
- Boca Raton
- West Palm Beach
Last updated: October 29, 2026
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If the bugs come back, so will TORO at no additional cost to you. TORO will respond with in 24 hours Guaranteed. Our technician will arrive quickly and deal with the pest problem to prevent recurrence.
