BugCorp guide
Rats vs possums: how to tell from the noise
Possums sound heavy: slow thumping, like a person walking across the ceiling, mostly around dusk as they leave and dawn as they return. Rats are lighter and faster: scurrying, scratching and gnawing on and off through the night. The weight and timing of the noise usually tells you which one you have.
The noise test
One heavy animal walking a regular route sounds very different from several light ones moving constantly. Note the time the noise starts for a few nights, because timing is the biggest clue you have.
Volume misleads people. A mouse in a wall cavity can sound like something much bigger at 2am, and a possum walking on insulation sounds softer than one on plasterboard. Weight, pace and timing together are far more reliable than loudness alone.
- Possum: heavy thumps and slow movement, mostly dusk and dawn, sometimes hissing or chattering
- Rat: light, fast scurrying and gnawing, on and off through the whole night
- Mouse: faint scratching and pattering, easy to mistake for something bigger in a quiet house
- Bird: scratching and shuffling in the eaves, mostly first light, often with chirping
Other clues to check
Droppings settle most arguments. Rat droppings look like dark, pointed grains of rice, scattered along runways. Possum droppings are larger pellets, more like a small jellybean, often in one area. Birds leave white splashes near the eaves.
Entry points tell the same story. A possum needs a gap you could fit a fist through: lifted tiles, broken eaves, gaps around flues. Rats get through much smaller holes and often come in at ground level, then run the wall cavities up. Possums also stain ceilings with urine over time, while rats leave greasy rub marks along their regular routes.
Pets often know before you do. A dog that stares at the ceiling at dusk, or a cat camped under the manhole, is usually reacting to exactly the animal you are trying to identify.
Why it matters which one
The fixes are completely different. Possums are protected native animals, so removal means a one-way door and proofing, done lawfully. Rats get a baiting and trapping program with entry points sealed. Using one fix on the other animal fails every time.
The worst version is rat bait thrown into a roof that actually holds a possum. That risks poisoning a protected animal, and even when it is a rat, baiting without a plan is how you end up with a dead animal smell in the walls. Confirm what is up there before anything goes in the roof.
What to do next
Keep a note of the noise times for two or three nights, and have a look around the manhole area and eaves from the ground with a torch. Do not climb into the roof yourself, summer roof voids are dangerously hot and wiring is often exposed.
An inspection confirms it quickly. Droppings, tracks, entry points and rub marks each tell their part of the story, and occasionally a camera settles it. Whichever animal it turns out to be, sealing the entry points is the permanent part of the fix.
If the noise is heavy and you suspect a possum, leave any gaps alone until the animal is out. Sealing an entry with a possum still inside turns a simple job into a dead animal job, and trapping one in is not legal either.
Get it sorted
- Rat & Mice Control →Baiting, trapping and proofing that actually holds.
- Possum Removal →Humane, lawful removal, then sealed out for good.
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Common questions
Can I have rats and possums at the same time?
It happens. A possum can hold the main roof void while rats run the wall cavities and subfloor. Mixed noises at different times of night are the giveaway, and the inspection covers both.
What time do possums leave the roof?
They head out around dusk to feed and return before dawn. If your noise is a heavy thump within an hour of sunset, then quiet until early morning, that pattern points to a possum.
Do rats make noise every night?
Pretty much. Rats are active most nights, in bursts, with the busiest periods just after dark and before dawn. Night after night of light scurrying and gnawing is classic rat behaviour.
Could the noise be birds instead?
Yes. Birds nesting in eaves and gutters scratch and shuffle, mostly at first light, and you will often hear chirping or see nesting material at a gutter corner. An inspection sorts bird, rat and possum apart quickly.
Last reviewed by Ross, licensed pest technician, October 2026.
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