Why Some Possums Choose Trees — and Others Choose Your Roof
In Sydney, possums are a common sight both in backyards and in roof spaces. But not all possums behave the same way. Some prefer to nest high in the trees, while others find their way into your ceiling. Understanding the differences between tree-dwelling and roof-dwelling possums can help you prevent invasions, identify species, and protect your home.
This guide breaks down the habits of both types, explains why possums end up in roofs, and outlines the signs to watch for depending on where they’re nesting.
Species That Prefer Trees vs Roofs
Different possum species have different preferences based on their size, nesting style, and natural behaviour.
Tree-Dwelling Possums
- Ringtail Possums: Typically build dreys (leaf nests) in trees or shrubs. They prefer dense vegetation and usually avoid roof cavities unless no trees are available.
- Pygmy Possums: Tiny, tree-dwelling species found mostly in bushland. Rarely encountered in suburban Sydney homes.
Tree-dwellers like Sugar Gliders rely heavily on their vision to glide between branches. Discover how possums use night vision to survive and navigate in the dark.
Roof-Dwelling Possums
- Brushtail Possums: The most common roof invaders. These large possums are strong climbers and will exploit gaps in roof tiles or vents.
- Mountain Brushtail Possums: Found on the outskirts of urban Sydney, especially in homes near bushland.
For more details, visit our overview on Types of Possums in Sydney.
Why Do Possums Enter Roofs?
Possums are opportunistic — they choose shelter based on availability and safety. When natural nesting areas (like tree hollows) are scarce due to urban development, your roof becomes a perfect alternative.
Roof cavities provide:
- Warmth and insulation, especially in winter
- Protection from predators and weather
- Dark, quiet spaces ideal for raising young
In contrast, tree-dwelling possums rely on natural cover. If trees are trimmed back or removed, they may be forced to look elsewhere — often ending up in human structures.
Key Differences in Nesting Habits
| Behaviour | Tree-Dwelling Possums | Roof-Dwelling Possums |
|---|---|---|
| Nesting Location | Tree hollows, dreys, shrubs | Roof cavities, wall voids, sheds |
| Nest Material | Leaves, bark, twigs | Insulation, paper, fabric, leaves |
| Visibility | Nests visible in trees or bushes | Hidden behind walls or ceilings |
| Noise Level | Minimal noise outside | Loud thumping, scratching inside |
To learn how to spot nesting behaviour, visit our guide on possum nesting materials and signs.
How to Tell What Kind of Possum You Have
If you’re hearing loud noises in your ceiling, there’s a good chance it’s a Brushtail Possum. However, outdoor sightings in shrubs or small trees may point to a Ringtail.
Clues include:
- Droppings: Larger and fibrous for Brushtails, smaller and more pellet-like for Ringtails
- Noises: Brushtails are much louder and thump around in roof spaces
- Tracks: Roof-dwelling possums leave claw marks on walls or fences
Check out our page on Identifying Possum Droppings for help distinguishing species.
Risks of Roof-Dwelling Possums
While tree-dwelling possums usually keep to themselves, those living in your roof can cause a range of issues, including:
- Chewed electrical wires and insulation
- Strong odours from urine and droppings
- Sleep disruption from nocturnal activity
- Structural damage to plaster, eaves, or vents
These risks make it important to act quickly if you suspect a possum in your roof. Visit our guide on Brushtail Possum in Roof for warning signs and next steps.
Can Tree-Dwelling Possums Become Roof-Dwellers?
Yes. Possums will adapt when forced by environmental changes. If you remove trees or dense shrubs from your yard, previously tree-dwelling possums may relocate to your roof.
To prevent this, we recommend:
- Leaving native trees and shrubs intact where possible
- Installing possum boxes in safe outdoor locations
- Blocking access to roof spaces using mesh or barriers
See our Possum Proofing services for more prevention advice.
Legal and Humane Removal Options
Possums are protected under NSW law. You cannot harm, trap, or relocate a possum without a license. All removals must be done by a licensed professional, and possums must be released within 150 metres of capture.
Learn more about your legal obligations on our Possum Removal Laws page.
Book a Possum Identification Inspection
If you’re unsure which type of possum is on your property — or where it’s nesting — Possum Ranger can help. We provide professional, legal, and humane inspections across all areas of Sydney.
Book your free possum assessment today or call 0468 166 733 to speak with a licensed specialist.
