Rodents are mostly active at night, which is when people hear them. Light, quick scratching or pattering inside a wall usually means mice. Heavier running across the ceiling, thumps and loud gnawing point more toward rats. But not every night noise is a rodent. Birds in vents, bats, insects and a house cooling after a hot day can all make sounds. Confirm with droppings or other signs before you buy traps or call someone.
Here is how to read the sounds, where to look, and what to do next.
What mice sound like
Mice are light, so their sounds are soft: scratching, skittering, tiny squeaks. You tend to hear them in walls near the kitchen and bathroom, under cabinets, and at the edges of the ceiling. The sound often starts after the house goes quiet and comes in short bursts as they move between spots.
What rats sound like
Rats are heavier. Running across a ceiling sounds like something rolling or thumping. Gnawing is louder and steadier. Texas Tech's Mammals of Texas says roof rats usually stay in attics, rafters and crossbeams and travel along pipes, beams and wires, so noise above the ceiling or along a roofline fits them. You may hear them earlier in the evening and on and off through the night.
Other things that make noise
Before you settle on rodents, rule these out.
- Birds nesting in vents, under tiles or in cooler housings, which make noise mostly at dawn and dusk
- Bats, which leave at dusk and return before dawn, and leave crumbly droppings under a roost
- Insects such as crickets in walls or garages
- The house itself: roofs, ducts and pipes tick and pop as they cool after a hot El Paso day
- A rooftop evaporative cooler: water, pumps and loose panels can rattle
How to confirm it
Look for physical signs near where you hear the noise.
- Droppings in cabinets, along baseboards, in the attic near the hatch or in the garage
- Gnawing on cabinet edges, food packaging or attic wiring
- Grease marks along walls, beams or pipes
- Nesting material: shredded paper, fabric or insulation
- Tracks in a thin layer of flour left along a wall overnight
If you find droppings, compare their size with our droppings identification guide. Do not sweep or vacuum them.
What to do next
For mice in walls, trap at the gaps where they come out and seal them. Our mice in the walls article explains. For rats overhead, check the roofline and attic, set rat-size traps along their routes and close openings over about half an inch, which extension guidance gives as the rat limit.
If you hear noise in the attic, are not sure what it is, or cannot safely reach the space, book an inspection. A technician can identify the animal and find where it gets in.
Keep a noise log
Before you call anyone, spend a few nights writing down what you hear. A simple log helps a technician narrow down the animal and the spot.
- Time of night the noise starts and stops
- Where: which wall, which part of the ceiling, near which room
- What it sounds like: scratching, running, thumping, gnawing, squeaking
- Whether it moves from place to place or stays in one spot
- Anything that changes it, like the cooler running or a pet reacting
Noise that moves along a wall at the same time each night is a runway. Noise in one spot that continues for a long time may be a nest or gnawing.
Noise from the garage
Garages are louder than walls because there are boxes and gear to move around. Rustling in stored items, especially cardboard, often means mice nesting. A woodrat can make more noise moving sticks and debris. Check the garage floor and stored boxes for droppings and nesting material. Our garage rodent control page covers what to do next.
Noise from a rooftop cooler
Coolers and their ducts can carry sound and sometimes shelter rodents or birds. If noise seems to come from the cooler, have it checked during service, and ask that gaps around the duct and lines be sealed.
Why El Paso houses carry sound
Many El Paso homes have low-slope roofs with shallow attic space, rooftop coolers with ducts and drywall ceilings close to the roof deck. Sound from an animal moving overhead carries easily into the rooms below. That can make a single mouse sound like a crowd, and it is another reason to check for signs before drawing conclusions.
Frequently asked questions
Why do I only hear them at night?
Mice and rats are mostly active after dark, and the house is quieter then.
Can one mouse make that much noise?
It can sound like more than one, especially through a thin ceiling. Droppings help show how much activity there is.
Is scratching in the ceiling always rats?
No. Mice, birds and the house itself can make overhead noise. Look for droppings and gnawing.
Should I bang on the wall to scare them?
It may quiet them for a moment but does not solve anything. Trap and seal instead.
What if I hear noise during the day?
Daytime activity can mean a larger population or a disturbed nest. Look for droppings and call for an inspection.
Sources
- Texas Tech University, Mammals of Texas: Black rat
- Wildlife Damage Management, eXtension: Rodent exclusion methods
- CDC: How to clean up after rodents