Scratching and chewing in a Hobart ceiling are not always a possum. NRE Tas notes that the noise sometimes turns out to be an introduced rat or mouse, and that some roofs have both. Rodents need a different plan from possums, and getting the order right protects your wiring, your health and the protected possums next door. This page explains the difference and what a rodent job usually involves.
Hobart Possum Removal is a referral service. We do not trap, bait or proof. With your consent, we pass your enquiry to one independent Greater Hobart pest business that inspects, quotes and contracts with you directly.
How to tell them apart
NRE Tas lists clear differences:
- Sound. Rats and mice scratch, chew and skitter. Possums walk heavily and growl, screech, hiss or cough.
- Droppings. Rats and mice have distinctive small droppings and do not soil where they nest. Possum scats are much larger.
- Behaviour. Rats collect seeds and grass. Possums do not. Rodents may chew wiring. Possums generally do not.
A daylight torch check from the manhole often answers the question. Look for droppings along the top plates, gnawed timber, shredded insulation and smear marks where rodents run.
Why it matters in Hobart homes
Black rats are good climbers and are common in older suburbs with mature gardens, fruit trees and timber houses. They get into roofs from overhanging trees and from subfloors. House mice move indoors as Hobart's nights turn cold in autumn. Rodents in a roof can:
- gnaw electrical cable sheathing, which is a fire and shock risk;
- contaminate insulation and ceilings with urine and droppings;
- breed quickly, turning a few animals into a colony in weeks.
Homes near bushland edges, creeks and rivulets, chicken coops, compost bins and aviaries tend to see more rodent activity.
Do not put a possum at risk
Never throw loose bait into a roof without knowing what is living there. Possums are protected in Tasmania, and a possum that eats rodent bait can die. Poisoned rodents also put pets, owls and other native predators at risk. Tasmania is home to native rodents too, so outdoor control near bushland should be targeted, not broadcast. A careful operator confirms the species and then uses traps or tamper-resistant bait stations that a possum cannot get into.
A typical rodent job
- Inspection of the roof, walls, subfloor and yard, to confirm the species, count activity and find entry points.
- Control, using snap traps and/or secured bait stations, placed and checked on a schedule.
- Proofing small gaps. Mice can fit through very narrow openings, so this means sealing pipe penetrations, weep holes, vents and roof junctions with rodent-proof materials.
- Hygiene advice. Closed compost bins, no pet food left out overnight, stored feed in sealed bins, and vegetation cut back from walls. NRE Tas gives the same advice to make a property less attractive to possums.
- Follow-up to confirm activity has stopped and to deal with any odour.
Seasonal pattern
Rodent calls in Greater Hobart usually climb from autumn and stay high through winter. That is also when possums most want a warm roof. Dealing with both at once, with exclusion for the possum and targeted control for rodents, is often the most efficient approach.
What to ask the business
- How will you confirm whether it is rats, mice or a possum?
- How will you keep bait away from possums and pets?
- Which entry points will you seal, and is proofing included?
- How many visits are included, and what happens if activity continues?
Rodents and possums together
Hobart roofs often host both. The order matters. First, identify what is there. Next, exclude the possum following NRE Tas guidance, so it is not exposed to rodent control. Then start targeted trapping or secured baiting for rats and mice, and seal the smaller gaps rodents use. Rushing to bait before the possum is out risks harming a protected animal and leaving a much bigger carcass in the ceiling. Asking a business to handle both in one plan often saves a second call-out.
Signs the problem is getting worse
- Noise in more than one room, or in the walls as well as the ceiling.
- Fresh droppings appearing after you have cleaned them up.
- Gnaw marks on stored items, cables or timber in the roof, garage or shed.
- A musty, ammonia-like smell near the manhole.
- Pets watching or pawing at a particular wall.
Any of these suggests an established population that needs more than a few traps. Acting at this stage is usually cheaper than waiting until wiring or insulation needs replacing.
Frequently asked questions
How do I know if it is a rat or a possum in my Hobart roof?
Rats and mice scratch, chew and skitter. Possums thump and growl. Rodent droppings are small. Possum scats are much larger. NRE Tas also notes rats collect seeds and grass, and may chew wiring.
Can I use rat bait in the roof if a possum might be there?
Avoid loose bait. A possum can eat it, and possums are protected in Tasmania. Use traps or tamper-resistant stations a possum cannot get into, or let a pest business confirm the species first.
Can rats damage electrical wiring?
Yes. Rodents gnaw cable sheathing. If you find chewed wiring, have a licensed electrician check it.
Why do I keep getting mice every winter?
Cold weather drives them indoors, and small gaps let them in. Sealing entry points and removing food sources is what stops the yearly return.
Will sealing the roof get rid of the rats already inside?
Not by itself. Sealing first can trap rodents inside, where they may chew new exits or die in the ceiling. Most operators control the rodents already inside, then seal the gaps, then check again.
Next step
Tell us your suburb and what you are hearing or seeing. With your consent, we pass your details to one independent Greater Hobart pest business. See how it works or make an enquiry.