Phone : (248) 791-2209
Phone : (248) 791-2209
Hearing scratching in the walls at night, or finding droppings in the pantry? As Detroit nights get colder, rodents move indoors looking for food and warmth. Before you buy traps, find out what you are dealing with. A mouse and a rat need different traps, different bait placement and different sealing work, so a wrong guess can let a small problem grow fast.
Check the droppings first. House mouse droppings are about 1/4 inch long, like a grain of rice. Norway rat droppings average about 3/4 inch, closer to a raisin. Mice are small, with a 2½–3½ inch body, and can squeeze through a 1/4-inch gap. Rats grow 13–18 inches long including the tail and need about a 1/2-inch opening.
Use this table to compare what you are seeing at home.
| Feature | House mouse | Norway rat |
| Body size | 2½–3½ in. body, plus a 3–4 in. tail | 13–18 in. long, including a 6–8½ in. tail |
| Weight | ½–1 oz | 7–10 oz |
| Droppings | About 1/4 in., small with pointed ends | About 3/4 in., larger with blunt ends |
| Smallest gap it can enter | About 1/4 in. (roughly a pencil’s width) | About 1/2 in. |
| Distance from nest | Usually 10–25 ft | Up to 100–150 ft |
| Where it nests | Inside walls, cabinets, attics, stored boxes | Basements, crawl spaces, burrows along foundations and yards |
| Reaction to traps | Curious; checks out new objects quickly | Cautious; often avoids new objects at first |
| Babies per year | 5–10 litters of 5–6 young | 4–6 litters of 6–12 young |
Droppings are the easiest clue, because rodents leave them wherever they travel and feed.
Tip: take a photo with a coin next to the droppings for scale. It helps a technician tell mice from rats before the visit. Never pick droppings up with bare hands, and do not sweep or vacuum them (see the safe cleanup steps below).
Where and how you hear rodents gives you a second clue. These are common patterns, not hard rules.
Seeing a rodent in daylight is a warning sign for both. It often means the population has grown large. For more warning signs, read our guide to the most common signs of rodents in Detroit homes.
These are the rodents homeowners in Detroit and across Wayne, Oakland and Macomb counties run into most often.
Deer mice and white-footed mice deserve extra care. They can carry hantavirus, which spreads when dust from their droppings, urine or nests gets into the air. Michigan confirmed its first known human case in Washtenaw County in 2021. Cases are rare, but it is the main reason to clean up droppings the safe way.
Mice and rats behave differently, so the plan to remove them is different too.
This is why store-bought traps often miss the problem. Learn more in why DIY rodent control fails. Our rodent control service in Detroit starts with an inspection to confirm the species, then seals entry points, traps, baits and rodent-proofs the home.
Whether it is a mouse or a rat, these five steps keep your family safe until a professional arrives.
It is possible, but they rarely share the same area. Rats are known to kill mice, so mice tend to stay away from places with heavy rat activity. If you see signs of both, have a professional inspect the whole property.
Usually, yes. Where there is one mouse there are often more nearby. A female house mouse can have 5–10 litters a year, so a few mice can become a large problem within weeks.
Both are a health risk. They contaminate food and surfaces and can spread disease through their droppings and urine. Rats are larger and can do more damage to wood, pipes and wiring, but mice are harder to keep out because they fit through tiny gaps.
No. Once rodents find food, water and shelter inside, they stay and keep breeding. Waiting usually means a bigger infestation and higher cost later. See the cost of ignoring rodent control.
At Pest City USA, rodent control starts from $250. The final price depends on the species, the size of the infestation and how many entry points need sealing. For ongoing protection, ask about our annual pest control plans.
You don’t have to guess. Pest City USA’s licensed technicians identify the rodent, find how it is getting in, and remove it with pet-friendly treatments. We serve Detroit, Warren, Oak Park, Livonia, Southfield, Ferndale and the wider Wayne, Oakland and Macomb county area, with same-day service available.