Scratching in the Walls at Night: Mice or Something Bigger?
Light, fast scratching and scurrying inside walls or ceilings — especially at dusk and after dark — is most often mice. Slower, heavier thumping or scratching, particularly in the attic or at dawn, points to something bigger like squirrels, and loud movement can mean raccoons. The timing and weight of the sound are the biggest clues.
Mice: light, fast, and in the walls
Mice are the most common cause of nighttime wall noise in Central New York, especially in fall and winter. You'll hear quick scratching and scurrying inside walls and above ceilings, often accompanied by droppings in cabinets or along baseboards. Mice are nocturnal, so the noise picks up after dark.
Squirrels: heavier, and usually in the attic
If the sound is louder, comes from the attic, and is most active at dawn and dusk, squirrels are likely. Gray squirrels are day-active; flying squirrels are nocturnal and often mistaken for mice until you notice the heavier movement. Squirrels chew, which makes them a wiring and fire risk.
Raccoons: loud and heavy
Distinct thumping, heavy movement, or vocal sounds — especially in spring — can mean a raccoon denning in the attic or chimney, often a female with young. Raccoons cause significant damage and carry health risks, so this one is firmly a call-a-professional situation.
What to do
Don't wait — whatever it is, it's easier to resolve early. We inspect to identify the animal, find how it's getting in, remove it, and seal the entry points so it can't return. The right approach depends entirely on the species, which is why identification comes first.
Narrow it down before anyone arrives
Three observations will get you most of the way to an identification, and all three are free. First, the time: strictly daytime activity, especially early morning, points to gray squirrels. Activity that starts at dusk and runs through the night points to mice, flying squirrels, or bats. Heavy movement around dawn and dusk suggests raccoons.
Second, the weight. Mice sound light and fast — scurrying, scratching, a sense of something small moving in bursts. Squirrels sound like something rolling or dragging. Raccoons sound like a person moving around, and people are usually surprised by how loud they are.
Third, the location. Inside a wall cavity at floor or mid-height is most often mice. In the attic overhead is squirrels, raccoons, or bats. If you can note those three things before the inspection, you have narrowed a broad problem to a specific one.
Why identification has to come before sealing
It is tempting to find the hole and close it. With wildlife that can be the worst available option. Sealing a bat roost during the summer maternity season traps flightless pups inside, which New York restricts for exactly that reason. Sealing a spring raccoon or squirrel den leaves dependent young in the structure. Both outcomes mean an animal dying inside a wall or attic, which turns a manageable problem into a serious odor and sanitation job in a place that is hard to reach.
That is the whole argument for identifying the species and the season before touching the entry point. It is also why a competent inspection asks when you hear it, not just where.
Common questions
How do I tell mice from squirrels by sound alone?
Weight and timing. Mice are light and fast — scurrying in short bursts, usually after dark, often inside a wall rather than overhead. Squirrels are heavier, sound like something rolling or dragging, and are active in daylight, especially early morning. Raccoons sound like a person moving around.
Should I plug the hole myself?
Not until the species and season are known. Sealing a bat roost in summer or a spring den traps young inside, which is inhumane, restricted in the case of bats, and leaves you with an animal dead inside a wall. Identification first, then sealing.
This is what we do