Quiet evenings can turn unsettled when you hear scratching in the attic or walls. The sound often starts after dark. Before you tear into drywall or set every trap in the garage, slow down and gather clues. Most nighttime scratching points to mice or rats, but other animals can make similar noises—and the right response depends on what you are dealing with. This guide is educational, not a diagnosis of your specific home.

Why Attics and Walls Attract Unwanted Guests

Attics, wall voids, and crawl spaces offer warmth, shelter, and quiet travel routes. Food does not have to be upstairs—pet food, bird seed, or kitchen crumbs downstairs can draw rodents that nest in less-traveled areas.

Alabama Cooperative Extension notes that house mice, roof rats, and Norway rats live close to people. Roof rats are more “aerial” than Norway rats and may use trees, utility lines, vine-covered fences, and attics. Mice can slip through openings as small as about 1/4 inch; rats may squeeze through openings around 1/2 inch. Cooler weather often makes indoor shelter more appealing. Hearing activity in fall or winter usually means an animal found an opening and a reason to stay—not that your home is unusually dirty.

What That Scratching Might Be

Sound alone rarely proves which animal you have. Patterns still help narrow the field.

House mice

• Light, quick scurrying or scratching, often intermittent
• Common in wall voids, cabinets, and storage areas; attics are possible too
• Small droppings about the size of a grain of rice
• Shredded paper, fabric, or insulation used for nesting

Rats

• Heavier thumps, gnawing, or longer runs along beams
• Roof rats often favor higher areas such as attics and rafters
• Norway rats more often nest near ground level, under slabs, or in lower spaces, though they can climb
• Larger droppings than mice; gnaw marks on wood, plastic, or wiring materials

Alabama Extension describes roof rats as sleeker, with a pointed muzzle, larger ears, and a tail longer than the body. Norway rats are heavier-bodied, with a blunt nose and a shorter relative tail. You may never see the animal—droppings, tracks, and gnawing often tell the story first.

Squirrels

• Often louder, more purposeful scampering
• Activity commonly during daylight hours
• May enter through roof edges, soffits, or damaged vents

Squirrels are wildlife, not the same problem as house mice and rats. If evidence points to a squirrel, call a wildlife control professional.

Other possibilities: raccoons, bats, and similar wildlife

Heavier walking, loud thuds, or daytime attic activity can involve larger wildlife. Soft fluttering near dusk or dawn may involve bats. Those situations need a wildlife specialist. Red Mountain’s rodent work focuses on mice and rats; this article does not claim wildlife or bat removal. Birds in vents, branches on the roof, and settling house sounds can also be mistaken for pests—look for droppings, grease marks, chewed materials, or nesting debris before you decide.

Clues Beyond the Noise

• Timing: Mice and rats are often most active at night. Daytime scampering leans toward squirrels or other wildlife, though heavy rodent pressure can bring daytime sightings.
• Droppings: Tiny rice-like pellets suggest mice; larger, capsule-shaped droppings suggest rats. Fresh droppings are usually darker and softer than old ones.
• Grease marks: Dark rub marks along beams or baseboards can show repeated travel routes.
• Gnawing: Fresh chew marks on wood, plastic bins, or wiring insulation are a reason to act sooner.
• Nesting materials: Shredded paper, fabric, or insulation gathered into a nest is a classic mouse sign.
• Entry points: Gaps at the roofline, chimney flashing, attic vents, utility penetrations, and garage weatherstripping are common ways in.

Alabama Extension also stresses sanitation—secure trash and remove debris piles that offer cover—alongside sealing openings. Exclusion without sanitation often becomes an ongoing chase.

Safety First: What Not to Do

Rodent droppings, urine, and nesting materials can carry germs. The CDC advises against sweeping or vacuuming dry droppings or nests, which can stir particles into the air. Safer cleanup generally means:

• Wear rubber or plastic gloves
• Ventilate the area when practical
• Wet urine and droppings with an EPA-registered disinfectant or a fresh bleach solution (the CDC describes about 1.5 cups of household bleach per gallon of water)
• Let the area soak, wipe with paper towels, and dispose of them in a covered trash can
• Wash gloved hands before removing gloves, then wash your hands with soap and water

For heavy infestations, the CDC recommends extra precautions and professional guidance. If you feel sick after possible rodent exposure, talk with a healthcare provider and mention the contact. Do not seal animals inside without a plan—they can die in place and create odor problems. Be careful with over-the-counter poisons around children, pets, and non-target animals. Follow every label, or leave baiting to a technician. Never handle dead rodents with bare hands.

Sensible First Steps

If the signs point to mice or rats—not wildlife—these steps often help:

• Remove easy food: seal pet food, wipe counters, and keep trash lids closed.
• Note where and when you hear activity for a few nights.
• Check outside for gaps at the roofline, vents, and utility lines.
• Avoid scattering poison in places you cannot monitor.
• If you set snap traps, place them along walls, keep them away from kids and pets, and check them often.

Trapping alone rarely solves a recurring attic problem if openings remain. Sealing entry points—exclusion—keeps new animals from replacing the ones you remove.

When to Call for Help

• Sounds lasting more than a night or two, or spreading to new parts of the house
• Droppings, nests, or gnawing in living spaces
• Chewed wiring or concerns about fire risk
• A strong odor that may mean an animal died in a void
• Uncertainty about whether the animal is a mouse, rat, squirrel, or something larger

For mice and rats, Red Mountain Pest & Termite offers mouse and rat infestation control. The one-time rodent service is listed at $295 and includes two visits—an initial visit and a follow-up the next week. Exclusion work is priced separately. Ongoing prevention is available through service plans such as Total Defense Plus (quarterly service and two perimeter rodent bait boxes) and year-round 365 Bundle options when that protection fits your home.

If clues point to squirrels, raccoons, bats, or other wildlife, ask a wildlife control specialist.

A Steady Path Back to Quiet Nights

Scratching in the attic or walls is unsettling, but it is also information. Listen for timing, look for droppings and entry points, clean safely, and seal what you can. When mice or rats are the issue, pairing removal with exclusion usually beats a scattershot DIY approach.

If you would like a technician to take a look, call Red Mountain Pest & Termite at 205-637-3260 or request a free quote. Tell us what you are hearing and where—we will help with the next step without pressure.

Frequently Asked Questions

Is scratching at night always a mouse or rat?

No. Mice and rats are common nighttime suspects, especially in attics and wall voids, but squirrels, other wildlife, and even non-pest house sounds can be involved. Use droppings, timing, and entry points—not sound alone—to decide what to do next.

Can I vacuum mouse droppings in the attic?

The CDC advises against sweeping or vacuuming dry rodent urine, droppings, or nesting materials because that can put particles into the air. Wet the material with disinfectant first, wipe it up, and wash your hands after removing gloves. For heavy contamination, get professional guidance.

Will sealing an attic vent stop the problem by itself?

Sealing helps only when animals are out—or when a professional confirms it is safe to close openings as part of a larger plan. Closing animals inside can create worse odor and sanitation issues. Exclusion works best with inspection, removal of active rodents, and sanitation.

What does Red Mountain’s rodent service include?

For mice and rats, the one-time rodent service is $295 for two visits (initial plus follow-up the next week). Exclusion is priced separately. For longer-term prevention, ask about Total Defense Plus or a 365 Bundle on our service plans page, or call 205-637-3260.

Sources: Alabama Cooperative Extension — Controlling Rats and Mice Around Your Home; CDC — How to Clean Up After Rodents.