When you notice a sign, the first question is what animal made it. Mice and rats leave different clues, and the answer changes how the job is done. This guide helps you read the evidence.
Reading the droppings.
Mouse droppings are tiny and pointed, usually found in kitchen drawers, pantries and cabinets. Rat droppings are larger and thicker, often along beams, in attics and near burrows. Fresh droppings are dark and moist, and older ones are dry and gray.
Other clues.
| Clue. | Mouse. | Rat. |
|---|---|---|
| Droppings. | Small, pointed. | Larger, thicker. |
| Gnaw marks. | Small, fine tooth marks. | Larger, deeper marks. |
| Noise. | Light scratching. | Heavier thumps and running. |
| Entry size. | About the width of a pencil. | About half an inch. |
| Nest place. | Walls, cabinets, boxes. | Attics, high spots, burrows. |
Roof rats climb and nest high, so noise overhead at dusk points to them. Norway rats burrow, so holes along a slab or under a shed suggest those.
Time and place.
Rodents are mostly active after dark. Scratching in a wall at night, pellets in a pantry and chewed packages suggest mice. Steps overhead, fruit with bite marks and burrows suggest rats.
Why species matters.
Mice squeeze through tiny gaps, so sealing must cover small openings such as pipe sleeves and door corners. Rats need larger gaps, and they chew harder materials, so metal and heavy mesh are essential. Trap type and placement differ, as the mouse page and rat page explain.
Safe handling.
Droppings never meet a broom or a vacuum. Air the room, put on gloves, spray the waste until wet, let the disinfectant work for roughly five minutes and wipe. Bag the debris and wash your hands. The CDC page below lays out the steps.
Three common mix-ups.
Several clues are easy to misread. Young rats can look like mice, and their droppings may be smaller than an adult's. A single large dropping among many small ones may mean both animals are present. And a scratching sound is not always a rodent at all, since birds, squirrels and settling building parts can all make similar noises.
- Do not decide on a single dropping, look at the whole pattern.
- Check for more than one size of dropping in the same area.
- Match the time of day to the animal, since squirrels and birds keep daylight hours.
- Remember that the answer can be both, especially in a building with many gaps.
If the evidence is mixed, a technician can usually settle it with a short walk-through. That is one reason an inspection comes first in most jobs.
Snap a picture of the pellets or chew marks and say so on the call, and the visit goes quicker.
Tap to call (888) 686-4821What to photograph before you call.
A few clear pictures save time. Photograph droppings with a coin beside them, gnaw marks next to a ruler or a coin, any burrow or hole near a wall and any nest material. Note the room and the date. Send the photographs by email if you like, but phone first so a person can book the visit.
What to do next.
Take photos of pellets beside a coin, record where and when you saw signs, then phone. An inspection identifies the species and tracks down the entries. Tell us which room and what time you notice activity.
Hold the broom: read this first
Rodent waste can carry disease, which is why the safe method is slow and wet. Every item traces to the CDC page named at the end.
- Hurrying lifts dust. Slow down and put the brush aside.
- Stagnant air in a closed room adds to the risk, so throw open the doors and windows and stay outside for about half an hour.
- Wear rubber, vinyl or similar gloves for anything soiled, then wash with soap and warm water when finished.
- Spray the pellets and the surface beneath until glistening, using a household disinfectant or bleach mixed to the label. After about five minutes, take it up with paper towels.
- Pick a bag that seals well, with gloves or a tool between you and the animal.
- Flu-like symptoms after a cleanup deserve a word with a physician, since diagnosis is outside our work.
Where the safety steps come from
These agency guidelines are public, and any homeowner can open the same pages.
- EPA rules for rodenticide products: Rules for consumer rodenticides, handy when you are comparing store-bought products.
- CDC advice on cleaning rodent droppings and nests: Ventilate, soak, bag: the order of work the CDC lays out.