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Wombats are herbivores whose staple food is tough native vegetation, especially grasses, sedges and rushes. Their biggest ecological influence comes from digging: extensive burrows relocate soil and create structures that some other animals use. Evidence from southeastern Australian forests shows that several vertebrates are more active at wombat-burrow sites, while others avoid them, so wombat effects are real but not universally beneficial.
What do wombats eat?
Wombats eat plant material. For bare-nosed wombats, the main foods are fibrous native grasses, sedges and rushes. The Australian Museum describes food choice as dependent on what is available at the time, rather than fixed to one plant species or one habitat.
Their menu can broaden when local conditions change. Wombats may also take dry leaves and stalks, roots, and small amounts of bark. These are additions to a diet dominated by coarse vegetation, not evidence that wombats are generalist omnivores.
Common foods of bare-nosed wombats
Plant species named by Australian wildlife authorities include snow grass, wallaby grass and kangaroo grass. NSW Environment and Heritage also lists sedges and the roots of shrubs and trees. The Australian Museum notes that tussock grass is preferred in forest areas, while kangaroo and wallaby grasses are important in open pastoral country.
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| Food or plant group | Where it is specifically reported | What the evidence means |
|---|---|---|
| Native grasses | Forests, grasslands and open pastoral country | The principal food category for bare-nosed wombats |
| Sedges and rushes | Included in the Australian Museum and NSW descriptions | Important fibrous foods alongside grasses |
| Roots | Listed by NSW Environment and Heritage | Part of the diet when accessible; the source does not provide a percentage |
| Dry leaves and stalks | Australian Museum account | Additional plant material, dependent on availability |
| Small amounts of bark | Australian Museum account | An occasional food, not the dietary staple |
Availability changes the menu
Two wombats living in different landscapes may eat different plants. A forest animal may select tussock grass, while one in open country encounters more kangaroo or wallaby grass. Weather, fire history, grazing pressure and seasonal growth can alter which plants are available, but the supplied species accounts do not establish a single menu for every population or season.
The Australian Museum summarizes the principle this way: “The main food for wombats is fibrous native grasses, sedges and rushes, and the choice of food depends on what is available at the time.” That statement applies to the bare-nosed wombat account and should not automatically be treated as a precise diet formula for every wombat species.
Do all wombat species eat the same things?
No. Species, habitat and local forage matter. The clearest quantitative distinction in the available evidence concerns the northern hairy-nosed wombat.
Bare-nosed (common) wombat
Bare-nosed wombats are associated with a broad selection of fibrous plants: native grasses, sedges, rushes, roots, dry leaves, stalks and occasional bark. The relative share of each item changes with what grows around the animal.
Northern hairy-nosed wombat
The Queensland Government’s northern hairy-nosed wombat account reports that grass makes up more than 90% of this species’ diet. The publication year is not stated in the cited material, so the figure should be read as the proportion reported by that species account, not as a current measurement for every population or year.
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| Species account | Diet description | Qualification |
|---|---|---|
| Bare-nosed wombat | Fibrous native grasses, sedges and rushes; also roots, dry leaves, stalks and small amounts of bark | Food choice varies with local availability |
| Northern hairy-nosed wombat | Grass accounts for more than 90% of the diet | Figure reported by the Queensland Government; publication date not stated in the cited material |
How do wombats feed?
NSW Environment and Heritage says wombats graze for about three to eight hours each night. That nightly grazing period is consistent with their reliance on bulky, fibrous plants that must be found across their home range. The source lists snow grass, wallaby grass and kangaroo grass, along with sedges and roots of shrubs and trees.
The duration is a reported range, not a promise that every wombat feeds for exactly the same number of hours. Food abundance, weather, disturbance and the individual animal can all affect how long it remains above ground; the agency description establishes the typical nightly range but does not quantify those causes.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsHow do wombat burrows change the ecosystem?
Digging is the main way wombats physically modify their surroundings. A wombat excavates soil while creating entrances, tunnels and chambers. NSW Environment and Heritage describes burrows that can reach up to 30 metres in length and several metres in depth.
Excavation relocates soil from underground to the surface and leaves a permanent-looking structure in an otherwise continuous patch of ground. That changes the physical layout of the habitat: there are openings to investigate, sheltered spaces below ground and disturbed soil around the entrance. The burrow itself becomes an ecological feature that can outlast the individual digging it.
Burrows are structures, not guaranteed shelters
Other animals may inspect or use wombat burrows, but use is not automatic. A tunnel can be inaccessible, occupied, too exposed, or unsuitable for a particular species. The existence of a burrow therefore creates an opportunity for shelter or another resource; it does not prove that every nearby animal benefits.
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It is also important to distinguish the physical effect from a claim about intention. Wombats dig for their own needs. There is no evidence in the cited material that they excavate to rescue, herd or deliberately protect other animals.
What animals use wombat burrows?
A 2024 peer-reviewed study, titled Wombat burrows are hotspots for small vertebrates in a landscape subject to gigafire, used camera traps in forests of southeastern Australia. Researchers compared sites where common wombat burrows were present with sites without those burrows, including locations affected by the 2019–20 Black Summer fires.
At burrow sites, cameras recorded increased activity by several vertebrates:
| Species recorded in the study | Pattern at sites with common wombat burrows |
|---|---|
| Bush rats | Higher activity |
| Agile antechinus | Higher activity |
| Lace monitors | Higher activity |
| Painted button-quail | Higher activity |
| Grey shrike-thrush | Higher activity |
| Other species in the camera-trap community | Some avoided burrow sites |
The authors also reported differences in species composition and higher native-mammal richness at burrow sites. In practical terms, the burrows were associated with a different and, for native mammals, locally richer animal community than nearby comparison sites.
What “higher activity” does and does not show
Camera-trap activity is evidence that animals appeared more often or were detected more frequently at those locations. It does not by itself show that a burrow entrance was used as a nest, that an animal entered the tunnel, or that the burrow caused a population increase.
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The study was conducted in particular southeastern Australian forests, not in every wombat habitat. Its fire-affected locations also represent a specific landscape history. The results support calling wombat burrows ecological hotspots in that setting, while avoiding a universal claim that all animals use them or that every burrow has the same effect.
Do wombats help other animals during bushfires?
Some animals may use burrows after disturbance, and the 2024 study found greater activity by several species at burrow sites in forests that included areas affected by the Black Summer fires. That is the strongest fire-related conclusion supported here.
The evidence does not establish that wombat burrows are guaranteed fire refuges, that every burrow remains safe during a fire, or that wombats intentionally save other animals. The study measured patterns of animal activity and community composition; it did not document a rescue behavior or prove that individual animals survived because they entered a wombat tunnel.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why the ecological effect is context-dependent
Wombat burrows can produce several possible benefits at once: they add below-ground spaces, create sheltered entrances and disturb soil. Those features may attract some species looking for cover or access to a resource. The camera-trap study demonstrates that this happens for multiple vertebrates in the studied forests.
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At the same time, a burrow can be neutral or disadvantageous for another species. Some animals avoided the sites in the same study. Avoidance may reflect habitat preferences, predators, competition or other conditions, but the supplied evidence does not identify a single cause. The safe conclusion is that wombat effects are uneven across species.
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- Physical engineering: digging moves soil and creates tunnels and entrances up to the dimensions reported by NSW Environment and Heritage.
- Habitat opportunity: some animals use or investigate the resulting structures.
- Community change: the 2024 study found altered species composition and higher native-mammal richness at burrow sites in its study forests.
- Not universal: other species avoided those sites, so a burrow is not automatically beneficial to the whole animal community.
How to interpret claims about wombats as ecosystem engineers
“Ecosystem engineer” is a useful way to describe an animal whose physical activity changes habitat for other organisms. Wombats fit that description through excavation: their digging relocates soil and leaves structures that other vertebrates can use. The term describes a process, not a claim that wombats manage an ecosystem deliberately.
Good explanations keep three levels of evidence separate. First, agency accounts establish what wombats eat, how long they graze and how large their burrows can be. Second, the camera-trap study establishes associations between burrow presence and animal activity in a defined region. Third, broader claims about landscape-wide benefits, fire survival or population recovery would require additional experiments or long-term monitoring and are not established by the cited material.
The bottom line on wombat diets and ecosystem effects
Wombats mainly eat tough native vegetation. Bare-nosed wombats select grasses, sedges and rushes according to local availability, with roots, dry leaves, stalks and occasional bark also reported. For northern hairy-nosed wombats, grass makes up more than 90% of the diet according to the Queensland Government account.
Their most important ecological contribution is the habitat they create while digging. Burrows can be up to 30 metres long and several metres deep, and a 2024 study in southeastern Australian forests found higher activity by several native vertebrates at sites with common wombat burrows. Because some species avoided those sites, the accurate conclusion is not that wombats help every animal, but that their burrows are context-dependent structures that can reshape local wildlife communities.
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