Step 1: When Do You Hear It?
- Night only, heavy — like a person walking: raccoon. The heaviest common attic animal; slow, deliberate thumps.
- Night, medium-weight shuffling: opossum. Slower and lighter than a raccoon, often with dragging sounds.
- Dawn and dusk, fast scurrying and rolling: gray squirrel. They leave at dawn to forage, return at dusk, sleep at night.
- Middle of the night, light rapid scurrying, sometimes in walls: rats or flying squirrels. Flying squirrels are nocturnal and often colonize in groups.
- Dusk/dawn, high-pitched chittering with soft scratching: bats — usually from inside a wall or above a ceiling near the roost.
Step 2: What Do the Droppings Look Like?
- Large (2–3"), tubular, in one repeated "latrine" spot: raccoon. Do not handle — roundworm risk.
- Small pellets that crumble into shiny fragments, in piles: bat guano — the sparkle is insect exoskeleton.
- Rice-sized, pointed ends, scattered widely: squirrel.
- Rice-sized with blunt ends, along runways and near food: rat or mouse.
- Cat-sized, tapered, often near the entry: opossum.
Step 3: What's Damaged?
- Torn soffit, bent vent, shingles peeled back: raccoon — they break in with force.
- A neat 2" round hole chewed through fascia or at a roof joint: squirrel.
- No hole at all — just a stained 3/8" gap: bats don't chew; they use what exists.
- Chewed wires, PVC or wood anywhere in the attic: rodents or squirrels — and a genuine fire hazard if it's wiring.
- Nest of leaves, insulation and debris in one corner: squirrel or raccoon; bats don't build nests.
Step 4: What To Do About Each
Raccoons: one-way door + litter check + exclusion. See the raccoon attic guide. Squirrels: one-way doors and chew-proof sealing; watch for two breeding seasons. Bats: legal exclusion only, timed around maternity season — see bat signs. Rats: snap traps inside, exclusion outside — never poison in the attic. Opossums: cage trap, seal the entry, done — they don't return to sealed dens.
Still not sure what you've got? A licensed pro identifies species from the inspection in minutes — with no obligation. Species-by-species details live in our species guides.
Animal in the Attic — FAQ
The noise is loudest at 3 AM — what is it?
Night-only heavy noise points to raccoons or opossums; light scurrying at night suggests flying squirrels or rats. Daytime activity, especially dawn and dusk, is classic gray squirrel. Bats you hear mostly at dusk/dawn as soft chittering.
Is it dangerous to sleep in the house with an animal in the attic?
Generally the animal wants nothing to do with you. The real risks are indirect: chewed wiring (fire), contaminated insulation, and — rarely — a rabid animal behaving oddly. But don't wait it out; attic problems only grow.
Should I put poison in the attic?
No. Poison in an attic means a dead animal in a wall void and weeks of smell — plus it's illegal for most wildlife species and dangerous to pets and predators. Removal plus exclusion is faster and cheaper than the poison aftermath.