Mice and Rats

All About Mice and Rats

Droppings in the pantry are unsettling, and they’re worse when you’ve cleaned up, set a trap, and found fresh ones a week later. Mice and rats leave different signs, and the quickest tell is dropping size: a mouse’s droppings run about 1/4 inch, while a Norway rat’s can reach 3/4 inch. Either way, don’t sweep or vacuum them. Wet them with disinfectant and wipe them up in gloves. Mice move into buildings to get through cold Illinois winters, and if fresh droppings turn up after you’ve cleaned, give PCC a call. We’re the local, family-owned team, in business since 2000 and serving families across Illinois, Iowa, Wisconsin, and Michigan.

What Are Mice and Rats?

Mice and rats are rodents, and indoors they matter because they damage property and contaminate food. Mice in Illinois include the house mouse, a non-native species that lives alongside people, and the native white-footed and deer mice sometimes find their way indoors as well. The two common rats are the Norway rat and the roof rat.

How to Identify Mice and Rats

Appearance: The difference between mice and rats shows up in size and build. An adult house mouse is light brownish to gray with large ears and a nearly hairless tail, and it measures about 5 to 7 inches including the tail. Adult roof rats weigh about 5 to 10 ounces and look sleek, with a pointed muzzle and a tail longer than the head and body. Norway rats run about 7 to 18 ounces, with a sturdier build and a blunter muzzle.

Lifecycle: A house mouse can breed in any month as long as it has food and a sheltered spot, so a home that offers both can support them in every season.

Similar Pests: A young rat can pass for a mouse, so size alone won’t settle it, but dropping size settles most cases. Deer mice have a white underside and a furred, two-tone tail, and voles have short tails. Our Rat vs. Mouse comparison and the voles page cover the look-alikes in more detail.

Activity and Seasonality

Active Seasons: House mice move indoors as autumn nights cool and stay put once an Illinois winter sets in. Rats don’t slow down and are active year-round. Homes we treat see the same seasonal pests return each year, and once the weather turns, mice are the ones we brace for.

Where Activity Peaks: Pantries, garages, and basements are the usual hot spots, along with any corner where food and something soft to nest in are close together.

Where to Find Mice and Rats in or Around Your House

Norway rats favor burrows and basements, so ground floors and the lowest level of the house are where to check for them. Roof rats climb, which puts them in attics and walls. Mice turn up in kitchens, garages, sheds, and cluttered corners where they can tuck away. Droppings, gnaw marks, tracks, and nests tell you where to clean and where a trap belongs, so note each one as you find it.

How to Get Rid of Mice and Rats

Immediate Action: Cleanup comes first, and the CDC’s wet method keeps you from breathing contaminated dust, which is the main way rodent-borne disease spreads. That’s why a broom or vacuum is the wrong tool. Work in this order:

• First, ventilate an enclosed space for about 30 minutes and put on rubber or plastic gloves.
• Next, spray droppings and nesting material with a bleach solution or an EPA-registered disinfectant until very wet, and let it soak 5 minutes or the time on the label.
• Then wipe everything up with paper towels.
• Double-bag the waste in knotted bags and place it in a covered bin.
• Disinfect hard surfaces, then wash your hands.

Professional Treatments: Cleanup and a trap deal with the droppings and the one mouse you catch, not with where they’re coming from. Our technicians inspect the home, show you the spots rodents may be getting in, treat where the problem starts, and keep checking through ongoing protection. The quarterly Pest Protection Club includes preventive treatment and interior rodent control, with free re-service for active members. The Rodent Protection Plan adds monthly monitoring for mice, rats, and voles.

DIY Methods: If you set a trap, the CDC suggests a traditional snap trap placed on the floor with its baited end against the wall, out of reach of children and pets and checked daily. Skip glue and live traps. DIY runs out when signs persist. The CDC says, “If new droppings (poop), urine spots, or gnawing persist after one week, you may be dealing with a rat infestation.” That’s the moment to bring in a professional, because poison and bait stations aren’t something to handle yourself.

How to Prevent Mice and Rats

• Keep food and pet food in tight-lidded containers.
• Cover garbage.
• Clear clutter that gives mice a place to nest.
• Cut back dense vegetation near the house.
• Keep debris away from the foundation.
• Check stored boxes before you bring them in.
• Fill small holes with steel wool held in place with caulk, since mice fit through a gap the width of a pencil (1/4 inch).
• Cover larger holes with hardware cloth or metal sheeting.
• Keep quarterly protection running through every season.
• Let us point out potential access points when we service your home.

Suggested Blog Posts

Narrower questions have their own pages, so start with the one closest to what you’re seeing at home.

• Mice in the garage
• What to do about a mouse nest
• Can mice climb walls?
• Pest control for mice
• One mouse versus a mouse infestation

Conclusion

Work out which rodent you’re dealing with, clean up the way the CDC recommends, and take away the food and shelter that drew them in. Mice go looking for a warm building every fall and winter, so the lasting answer is protection that runs year-round, and that’s what the quarterly Pest Protection Club provides. If new signs appear after your cleanup, Schedule your service and we’ll look for the source.