Almost every loft pest can be identified by sound alone before you ever go up there. The two variables that matter are time of day and the character of the sound.
What you hear, by species
- Mice: light scratching and gnawing, mostly between 9pm and 1am, then again at 5–7am. Footsteps inaudible — you'll only hear claws on wood.
- Rats: heavier scratching, audible thumps, dragging sounds (they cache food). Peak activity midnight to 4am.
- Squirrels: loud scampering, rolling sounds (nuts), heavy thumps during the day — usually 7am–4pm. Silent at night.
- Birds (starlings, pigeons): scratching and fluttering at dawn and dusk, often accompanied by chirping. Activity stops at full dark.
- Bats: very quiet scratching, ultrasonic clicks (inaudible without a detector), activity from 30 min after sunset to ~1 hour before dawn.
What the rhythm tells you
Continuous scratching in one spot usually means gnawing — a rodent enlarging an entry point or chewing wiring (a fire risk). Brief bursts of scampering across the joists are normal activity. Repeated dragging sounds suggest nest-building or food caching, both signs of an established infestation, not a one-off visitor.
When it's urgent
Active rats, suspected wiring damage, or any sign of bats in the loft are all next-day priorities. Mice and squirrels can usually wait 3–5 days for a scheduled visit. See our emergency pages for same-day rat and squirrel response, or the signs guides for fuller identification chains.