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Australasian Grass-Owl (Tyto longimembris)

The Australasian Grass-Owl is a medium-sized, ground-associated barn owl of tall grasslands, swamps, reedbeds and other open habitats. On Australian projects, clearing dense ground cover, fallow fields, wetland margins or coastal grasslands can remove roosts and nests, kill birds directly, or disrupt breeding colonies.

Conservation status

New South Wales, Biodiversity Conservation Act 2016: Vulnerable.

Northern Territory, Territory Parks and Wildlife Conservation Act 1976: Near threatened.

Breeding season

Timing varies with rainfall, food supply and location. The months below combine the documented Australian captive breeding dates with the reported pattern of post-breeding dispersal and seasonal occurrence. Wild breeding timing is less certain than the captive records.

Use the season table as a planning guide, not as a substitute for a pre-clearing inspection. Rainfall can alter breeding and local occurrence, and birds may be present outside the indicated peak period.

  • Breeding, laying and incubation: Captive laying was recorded in April 1997 and June to August 1998. Incubation lasted 29 to 31 days and began after the second egg.
  • Young in nest and dependent: In the captive study, eggs laid from April to August produced chicks during May to September. Chicks remained associated with the ground nest until fledging, with fledging success of 50 to 75% in two clutches.
  • Juvenile dispersal and local movement: The species is mainly sedentary, with some post-breeding dispersal of juveniles. Australian birds may disperse when favourable breeding conditions deteriorate, but the supplied documents do not define fixed dispersal months.
  • Presence in suitable Australian habitat: Birds can occur throughout the year in suitable Australian habitat, but local presence is sporadic and influenced by rainfall and food availability. The species is not uniformly present across its range.
  • Highest clearing risk: April to October covers the documented laying, incubation and dependent-young period from the captive study. Wild timing is variable, so dense ground-cover habitat should be checked before clearing in every month.

Identification

This is a medium to large Tyto owl with a distinctive heart-shaped facial disc and unusually long legs. It is most often detected in flight, when the legs extend well beyond the tail, or when it is flushed from dense grass.

Adults have dark brown upperparts with golden-buff markings and pale speckles. The crown is blackish, the facial disc is grey-buff with a dark border, and the underparts are pale buff to whitish with little or no streaking on the breast and neck-sides.

The legs are long, pinkish-white and partly unfeathered on the lower tarsus. The bill is pale or pinkish-white, and the eyes are dark brown. In flight, the long legs hanging behind the tail are a useful field mark.

Length: Male 32 to 38 cm; female 35 to 42 cm.

Wingspan: 100 to 116 cm.

Weight: About 400 g for males and 460 g for females; captive females measured 413 and 480 g.

Identification: Similar species and calls

The species is similar in general size to the Barn Owl, but the Australasian Grass-Owl has longer legs and is more strongly associated with dense grass and wet ground cover. Its lower legs are less feathered than those of many owls.

The main call is a harsh, hissing screech or scream. A cricket-like chirruping call has also been reported. The call is described as louder than that of a Barn Owl but softer than that of a Masked Owl.

Identification: Field signs and nest evidence

Look for flattened vegetation and narrow tunnels through dense swamp or grass vegetation. Roosts and nests may be on the ground beneath dense tussocks, in bare sand, or within other flattened ground cover.

The nest is a simple, unlined scrape on the ground. Eggs, pellets and prey remains may be present, but the supplied documents do not provide diagnostic measurements for tracks, pellets or other signs.

Eyeshine may be encountered during night searches, but its colour is not specified in the supplied documents. A bird flushed from a daytime roost may glide down a slope or take low, silent flight.

Nest form: Simple ground scrape, often beneath dense grass and on bare sand.

Roost form: Flattened vegetation within tunnels through swamp or tall grass.

Distribution: Australian range

In Australia, the species is widely distributed but patchy and usually recorded at low density. Records are concentrated in coastal and sub-coastal eastern Australia, with additional records in northern Australia and occasional inland records.

The core described Australian range extends through sub-coastal environments from northern New South Wales to Cape York Peninsula in Queensland, with records in northern parts of the Northern Territory and the Kimberley region of Western Australia.

The species has also been recorded in coastal eastern Australia, including Queensland, New South Wales and Victoria. Inland or vagrant records include the Barkly Tableland in Queensland, the Lake Eyre and upper Darling River catchments, and one record from south-western Western Australia.

  • New South Wales: mainly northern and coastal or sub-coastal areas, with records extending into southern New South Wales.
  • Queensland: the main Australian range, from the New South Wales border to Cape York Peninsula, including the north-east coast and some inland records.
  • Northern Territory: northern parts, with a breeding record from the Alligator River area.
  • Western Australia: Kimberley records, including near Broome, the Dunham River and Kununurra, plus one historical south-western record.
  • Victoria: records are included in the wider coastal eastern Australian occurrence data, but the supplied documents do not identify a Victorian stronghold.

Distribution: Strongholds and population pattern

The strongest concentration of Australian breeding records is on the east coast from Cairns south to near Rockhampton. Breeding can occur in loose colonies, including 40 to 50 pairs in a 40 ha fallow rice field and up to 30 birds in an area of less than 100 ha.

At most recorded locations, birds occur at very low density. Presence is often sporadic, and birds may disperse when rainfall, food supply or other favourable breeding conditions deteriorate.

Atlas records: 817 records were reported in the Atlas of Living Australia database accessed in 2015.

Recorded breeding concentration: Most Australian breeding records were from the east coast between Cairns and near Rockhampton.

Colony observations: 40 to 50 pairs were recorded nesting in a 40 ha fallow rice field; up to 30 birds were recorded in less than 100 ha at another site.

Population size: No Australian population estimate is provided.

Trend: The supplied sources describe the species as patchy and sporadic in Australia. A quantitative Australian trend is not provided.

Habitat: Habitat types

Australasian Grass-Owls use open habitats with tall or dense ground vegetation and enough cover for daytime roosting and ground-level nesting. They are primarily associated with wet or seasonally productive grass habitats, but can also occur in modified sites.

Documented habitats include tussock grasslands, tall grasslands, heaths, swamps, coastal dunes, treeless plains, grassy gaps between trees, tree-lined creeks, mangroves, agricultural crops, fallow rice fields and young pine plantations.

The species is also recorded from reedbeds, grassy hillsides, small grassy islands and airfields. In Hong Kong, it has been recorded as a rare winter visitor and spring migrant in these open habitats.

  • Prioritise inspection of tall grass, sedgeland, reedbed and swamp margins before clearing.
  • Include fallow fields, crop margins, coastal dunes, grassy creek lines and young plantation ground cover in habitat checks.
  • Do not assume that a modified or previously cleared field has low value, as dense fallow rice fields have supported breeding colonies.

Habitat: Structure and environmental conditions

The key structural feature is dense, tall ground cover that allows the birds to move through tunnels, roost during the day and place a ground nest beneath vegetation. Nests may be on bare sand beneath a dense tussock.

The species is associated with sub-coastal environments in Australia and appears to respond to rainfall and food availability. Birds may disperse when favourable breeding conditions deteriorate.

The supplied documents do not provide a national elevation range, minimum patch size, minimum vegetation height or minimum distance from trees or water.

Elevation limit: Not specified in the supplied documents.

Climate and rainfall: Breeding and local presence appear to vary with rainfall and food availability, but no quantitative rainfall threshold is provided.

Foraging habitat: Diet

The Australasian Grass-Owl is a nocturnal ground-cover hunter that detects prey while flying low over open vegetation. It uses its long legs to reach through dense cover and seize prey.

The diet is predominantly small rodents. Studies cited in the supplied sources identify the long-haired rat and cane rat as common prey in parts of Australia.

The species is not dependent on a particular food plant. Suitable prey habitat is more likely to be associated with dense grass, swamp vegetation, crops and other areas that support small mammals.

Main prey: Small rodents, including long-haired rats and cane rats.

Captive feeding reference: Captive birds were fed 4 to 5 adult mice per day, increased to 4 to 6 mice per day when breeding.

Foraging habitat: Foraging behaviour

Foraging occurs at night, with prey detected from the wing. The long legs can penetrate dense ground cover, allowing the owl to seize prey within grass or swamp vegetation.

Records describe low, silent flight before landing on a small grassy island after dusk. The supplied documents do not provide a measured foraging radius or home-range size.

Foraging range: No measured home range or foraging distance is provided.

Activity period: Primarily nocturnal.

  • Retain connected areas of dense ground cover around known roosts and nest sites where practicable.
  • Inspect likely foraging areas as well as the immediate nest location, because feeding habitat may extend through adjoining grassland, swamp, crop or reedbed.
  • Avoid rodenticide use near occupied habitat where alternatives are available, because rodent-eating raptors may be exposed to poisoned prey.

Breeding habitat: Breeding biology

Breeding occurs on the ground in dense grass or wetland vegetation, and may occur in loose colonies when food and cover are favourable. The limited breeding data indicate that disturbance can affect both eggs and dependent young.

The breeding information below is based mainly on captive observations. Wild breeding timing is less well documented, so project teams should treat occupied ground-cover habitat as potentially sensitive whenever birds, nests or dependent young are detected.

Breeding pairs may be assisted by female young from the previous year. In captivity, an older female shared incubation and chick-rearing with the breeding female.

Breeding season: Captive egg laying was recorded in April and June to August. Wild timing is not fully defined.

Clutch size: Seven to 10 eggs in the captive study.

Incubation: 29 to 31 days, beginning after the second egg was laid.

Egg laying interval: Usually 1 to 3 days, with longer intervals recorded in an extended clutch.

Age at maturity: 12 months in the captive study.

Fledging success: 50 to 75% in two captive clutches.

Lifespan: One captive male lived for 18 years. Wild longevity is not known.

Breeding habitat: Nest habitat

The nest is a simple scrape on the ground, usually beneath dense tussock or other tall ground cover. One captive nest was on bare sand under a dense stand of Rhodes grass.

Wild breeding records include loose colonies in large fallow rice fields. A project area containing several occupied nests may therefore support more than one breeding pair, even where birds are not seen during daytime.

Nest position: On the ground, usually beneath dense vegetation.

Nest material: Simple scrape, unlined.

  • Search dense tussocks, swamp vegetation, reedbeds and flattened grass for scrapes before earthworks or slashing.
  • Check adjoining habitat for additional nests where one pair or nest is found, because loose colonies have been recorded.
  • Reduce entry, vehicle movement, mowing and cleaning disturbance around an active nest during laying, incubation and chick-rearing.

Sheltering habitat: Roost structure

Day roosts are concealed within dense ground vegetation rather than in tree hollows. The species can remain close to the ground and may use tunnels formed through flattened swamp or grass vegetation.

Roost areas consist of flattened vegetation within tunnel-like systems in swamp vegetation. Similar dense vegetation is also used for nesting.

Suitable shelter has been recorded in tall grasslands, reedbeds, swamps, heaths, crops and other open vegetation. The supplied documents do not give a minimum roost patch size or a measured roost entrance width.

Typical roost: Flattened ground vegetation within tunnels through swamp or tall grass.

Tree hollows: No use of tree hollows is reported in the supplied documents.

Burrows and dens: No use of burrows or mammal dens is reported.

  • Inspect dense, flattened or tunnelled vegetation before clearing, slashing, grading or burning.
  • Search the edges and interior of swamp, reedbed and tall grass patches, not only trees and drainage lines.
  • Use daytime flushing checks only under an approved fauna handling and survey procedure, as roosting birds may be concealed until approached.

Sheltering habitat: Ground-level evidence

A flushed bird may glide from a daytime roost or emerge in low, silent flight after dusk. Flattened tracks or tunnels through vegetation are more likely to be useful than footprints, because the supplied documents do not describe diagnostic tracks.

The species is largely terrestrial compared with many other owls. This makes dense ground cover especially important during daytime sheltering and breeding.

Threats: Clearing and construction

The main project risks are direct destruction of ground nests and roosts, loss of dense grass or wetland cover, and disturbance during breeding. The species can occur at low density and may be present only temporarily, so absence during one inspection does not demonstrate that habitat is unused.

Ground scraping, mowing, slashing, grading, excavation and vehicle movement can destroy nests or roosts in dense grass and wetland vegetation. A wild nest used by the Perth Zoo study was destroyed when a tractor-drawn mower ran over it, killing at least two siblings.

Clearing fallow fields or wetland margins can remove both breeding cover and rodent-rich foraging habitat. Breeding colonies have been recorded in areas of 40 ha and less than 100 ha, so a relatively small project footprint may affect several pairs.

  • Complete targeted checks of tall grass, swamp, reedbed, fallow crop and dense tussock habitat before clearing.
  • Stop work and engage the fauna spotter catcher if an owl, nest, eggs, chicks, pellets or a tunnelled roost is found.
  • Maintain a no-entry buffer around an active ground nest in accordance with the relevant approval, rehabilitation plan and fauna handling procedure.

Threats: Fragmentation, fire and hydrology

Fragmentation can remove connected roosting and foraging cover, particularly where grassland, swamp or crop habitat is divided by roads, hardstand or drainage works. The supplied documents do not quantify a minimum habitat patch or movement corridor.

Fire can remove ground cover and expose nests and roosts. No species-specific fire interval or fire response is provided, so burning should not be undertaken in occupied habitat without checking for breeding birds and considering the retention of unburnt dense cover.

Drainage, filling or altered flooding can change swamp vegetation and reduce the dense cover used for roosting and nesting. The documents identify swamps, marshes and seasonally wet grasslands as habitat, but do not quantify a hydrological threshold.

  • Stage drainage, filling and vegetation removal to retain dense refuge cover and avoid active nests.
  • Retain connected wet or seasonally wet grass cover where practicable.
  • Inspect habitat again after fire, flood or major rainfall changes because local presence may vary with conditions.

Threats: Roads, predators and contaminants

Road construction and vehicle movements can disturb low-flying or ground-associated birds and can remove habitat at the edge of grasslands and wetlands. A Hong Kong bird was found dead on an airport runway, although the supplied documents do not establish a general Australian road mortality rate.

Rodenticides are a documented concern for grassland raptors that feed on rodents. The supplied source discusses this threat for the Taiwanese subspecies and does not provide Australian poisoning data, but avoiding secondary poisoning is appropriate near occupied Australian habitat.

The supplied documents do not identify a disease as a major threat and do not provide species-specific evidence about introduced predators. Foxes, cats and other predators may still affect ground nests and chicks, so nest protection should include predator access where relevant to the project risk assessment.

  • Control vehicle speed and night driving near known roosts, nests and wet grassland habitat.
  • Do not distribute rodenticide or toxic bait near occupied habitat unless the method is authorised and assessed for secondary poisoning risk.
  • Record predator activity at ground nests and apply approved nest protection measures where they will not disturb the birds.

Threats: Conservation context

The species is listed as Vulnerable in New South Wales and Near Threatened in the Northern Territory in the supplied information. It is not listed under the EPBC Act in that information.

Global sources describe a wide but patchy distribution and a global Least Concern assessment. This does not remove the need for site-level controls in Australian states where the species is listed or where breeding colonies occur.

New South Wales: Vulnerable.

Northern Territory: Near Threatened.

EPBC Act: Not listed in the supplied information.

Global assessment: Least Concern in the supplied sources.

Survey methodology: 1. Night searches and spotlighting

Australasian Grass-Owls use tall grasslands, swamps, marshes, reedbeds and other dense ground cover. They are nocturnal, can roost in flattened vegetation and may occur at low density or disperse when breeding conditions deteriorate. The supplied sources do not provide a species-specific Australian survey effort standard, so use the current state survey guideline and project approval conditions where they apply.

Search suitable grassland, swamp, marsh, reedbed, wetland margin and dense ground-cover habitat after dark.

Use quiet walking or vehicle-based spotlighting along mapped habitat edges, tracks and transects, and record the route, start and finish times, weather, observers and area searched.

Prioritise periods with suitable access and safe conditions, and repeat searches because the species can occur sporadically and at low density.

Look for a large, pale-faced owl flying low over grass, perched at the edge of dense cover, or using its long legs to seize prey in ground vegetation.

Record all observations, including birds heard but not seen, flight direction, behaviour, roost locations and any likely nesting or hunting area.

Adult length: 32 to 42 cm, with females larger than males

Wingspan: 100 to 116 cm

Typical habitat use: Tall grasslands, swamps, marshes, reedbeds and dense ground cover

Survey methodology: 2. Daytime habitat and roost inspection

Inspect suitable habitat during the day for flattened vegetation, tunnels through swamp vegetation, pellets, feathers, prey remains and other signs of roosting or repeated use.

Search grassy hillsides, reedbeds, small grassy islands, airfields and wetland margins where access and safety controls permit.

Approach potential roosts quietly and avoid trampling dense grass or flushing a bird repeatedly.

Map each sign or roost with coordinates, photograph it where appropriate and record the vegetation structure, wetness, disturbance and connection to nearby retained habitat.

Treat a daytime flush from dense vegetation as a detection and schedule follow-up night searches of the surrounding habitat.

Survey methodology: 3. Habitat and seasonal survey design

Map all tall grassland, swamp, marsh, reedbed, wetland margin, treeless plain and dense ground-cover habitat within and beside the work area before field surveys begin.

Survey both the impact area and connected retained habitat because the species may roost, hunt and nest near each other during favourable conditions, then disperse when conditions deteriorate.

Time repeat surveys to the period when suitable habitat is present and breeding or post-breeding activity is possible, using local rainfall, water levels and the current state survey guideline to set the schedule.

Where a bird, roost or nest is detected, inspect nearby habitat for additional birds because breeding has been recorded in loose colonies and groups.

Do not claim absence from a single negative visit, particularly where habitat is extensive, wet, dense or seasonally occupied.

Reported Australian breeding density: 40 to 50 pairs in a 40 ha fallow rice field, and up to 30 birds in less than 100 ha, in the cited observations

Known breeding behaviour: Breeding can occur in loose colonies, and young females may assist with incubation and chick rearing in captivity

Survey methodology: Minimum effort and reporting

  • Use the current state or territory survey guideline, approval conditions and advice from the relevant wildlife authority to set the number of survey nights, hours, transects and repeat visits, because no species-specific effort schedule is provided in the supplied documents.
  • Report the survey area, habitat inspected, dates, start and finish times, weather, water conditions, observers, method, transect or route length, spotlight hours and all detection results.
  • Submit confirmed records, including absence of a previously mapped roost or nest where relevant, to the relevant state or territory wildlife database and provide records required by the project approval.
  • Retain photographs, GPS data, call or observation notes, habitat maps and copies of permits with the project environmental records.

Before habitat disturbance: Avoid and minimise habitat loss

Plan around the species' dependence on open, dense ground cover and wetlands. Avoid removing occupied roosting, nesting or hunting habitat, and retain connected areas wherever practicable.

  • Retain tall grassland, swamps, marshes, reedbeds, wetland edges, dense ground cover and flattened vegetation used for roosting or nesting.
  • Avoid placing access tracks, compounds, stockpiles, lighting and drainage changes through connected grassland and wetland habitat.
  • Retain links between suitable habitat patches because records indicate patchy occurrence, local dispersal and loose colonial breeding in favourable areas.
  • Keep clearing footprints as small as practicable and use existing disturbed areas for laydown, parking and access.
  • Treat a mapped roost, nest, repeated hunting area or colony as a site constraint and obtain ecological advice before altering it.

Before habitat disturbance: Approvals and work planning

  • Check the current EPBC Act status and state or territory listing before works begin, and obtain any required referral, permit, licence or approval.
  • For New South Wales, check the current threatened species requirements because the supplied material identifies the species as vulnerable under the state listing.
  • Confirm whether fauna handling, relocation, nest disturbance, animal rehabilitation and clearing of wetland or threatened habitat require separate approvals.
  • Prepare a fauna management plan that maps suitable habitat, survey results, no-go areas, clearing limits, fauna procedures, stop-work triggers and reporting responsibilities.
  • Stage works to keep suitable roosting and hunting habitat available while clearing proceeds, and avoid active breeding or nesting areas identified by the ecologist.

Before habitat disturbance: Pre-clearance preparation

  • Complete a pre-clearance inspection immediately before disturbance, with the timing set by the project ecologist and the relevant approval conditions.
  • Mark retained habitat, no-go areas, roosts, nests, wetland margins, access limits and fauna exclusion zones on the ground and in the machinery plans.
  • Use exclusion fencing where it can prevent machinery and people entering retained grassland, wetland or roost habitat without creating a barrier to animal movement.
  • Brief all operators on the species' appearance, nocturnal activity, low flight behaviour, likely roosting cover and the stop-work process.
  • Confirm the fauna spotter catcher's authority, contact details, handling equipment, transport arrangements, wildlife carer or veterinary contacts and incident forms before clearing starts.

During habitat disturbance: Daily controls and machinery coordination

Clear slowly and keep an ecologist or authorised fauna spotter catcher involved whenever suitable habitat is disturbed. The species is a nocturnal, ground-associated owl, so dense grass, wetland vegetation and concealed roosts need particular attention.

  • Inspect exclusion fencing, no-go markers, access routes and retained habitat before each work shift.
  • Where practicable, schedule vegetation disturbance in daylight so the spotter catcher can inspect cover and observe animals before machinery enters.
  • Use a staged, low-speed approach that allows the spotter catcher to walk ahead of machinery and direct the operator to stop or alter the work area.
  • Keep machinery, workers, lighting and noise out of retained roosting, nesting and wetland habitat unless the approved method specifically allows access.
  • Recheck the work area after overnight activity, heavy rain, flooding or any event that could change animal movement or reveal a new roost.

During habitat disturbance: Habitat feature handling

  • Inspect tall grass, flattened vegetation, reedbeds, swamp margins and other dense ground cover immediately before removal.
  • Do not assume that the absence of a tree hollow means the area has no fauna value, because this species is principally associated with terrestrial grassland and wetland cover.
  • Retain logs, rocks, dense grass tussocks, wetland vegetation and connected cover where they form part of the retained habitat or provide shelter and prey habitat.
  • Do not drain, fill, burn or modify a wetland, swamp or marsh during clearing unless the activity is covered by the approved environmental controls.
  • If an occupied nest, roost or concentration of birds is found, protect the feature and surrounding habitat until the ecologist sets a lawful and practical work method.

During habitat disturbance: Animal encounters and stop-work triggers

  • Stop machinery immediately if an Australasian Grass-Owl, nest, dependent young, injured bird, occupied roost or repeated hunting area is found in the active work zone.
  • Keep workers and machinery back, reduce noise and lighting, and allow the authorised fauna spotter catcher or ecologist to assess the animal.
  • Do not catch, restrain, transport or relocate the bird unless the person is authorised under the applicable state or territory approval and the action is necessary and lawful.
  • If relocation is approved, move the bird only to suitable nearby retained habitat identified by the ecologist, with connected cover and no immediate work risk.
  • Take an injured or distressed bird to an appropriately authorised wildlife carer or veterinarian through the approved wildlife response pathway.
  • Do not handle eggs or dependent young unless the relevant authority and project approval expressly permit the action.
  • Resume work only after the fauna spotter catcher or ecologist records that the animal is clear, the exclusion area is set, or the revised method has been approved.

During habitat disturbance: Records and incident reporting

  • Record every observation, attempted rescue, relocation, injury, nest or roost encounter with the date, time, coordinates, habitat, work activity, animal condition, action taken and outcome.
  • Photograph the habitat and animal only where this can be done without causing additional disturbance.
  • Notify the project environmental officer and relevant authority within the timeframe in the approval or fauna management plan.
  • Update the no-go map and daily toolbox briefing after every fauna incident or new detection.

After habitat disturbance: Post-clearance checks

Post-clearance work should confirm that no animal remains trapped in the disturbance area and that retained habitat controls are still working. Continue monitoring where clearing has removed or isolated suitable grassland or wetland habitat.

  • Complete a systematic inspection of the cleared footprint, retained edges, stockpiles, drains and temporary works for birds, dependent young, injured animals, nests, roosts and trapped fauna.
  • Inspect dense grass and wetland margins again after the first night following clearing where the project ecologist considers that residual risk remains.
  • Remove temporary hazards such as open pits, unsecured pipes, netting, deep trenches and fencing that could trap an owl or restrict movement between retained habitat patches.
  • Confirm that all no-go markers, exclusion fencing and wetland protection measures remain in place until the project stage is complete.

After habitat disturbance: Monitoring and reporting

  • Repeat night searches and daytime habitat inspections where the species was recorded, suitable habitat remains beside the works, or the approval requires post-clearance monitoring.
  • Track use of retained grassland, wetland edges and connected vegetation through mapped observations, roost signs and any breeding records.
  • Report clearing areas, retained habitat, incidents, relocations, injuries, monitoring effort and outcomes to the project regulator or approval agency as required.
  • Submit new confirmed records to the relevant state or territory wildlife database and update the project fauna register.

After habitat disturbance: Ongoing controls and offsets

  • Maintain weed, erosion, drainage, lighting, vehicle access and domestic or feral predator controls around retained habitat.
  • Repair damaged exclusion fencing and reinstate wetland or grassland protection measures after each construction stage.
  • Where approved impacts cannot be avoided, implement the required offset or conservation measure and document its location, management actions and performance criteria.
  • Review the fauna management plan if monitoring shows that retained habitat is being abandoned, becoming isolated or no longer providing dense ground cover.

Rehabilitation actions: Recreate habitat structure

Rehabilitation should recreate connected open habitat with dense ground cover and suitable wetland structure. The aim is to restore roosting, nesting and hunting opportunities rather than simply replace cleared vegetation with trees.

  • Re-establish locally appropriate tall native grassland and wetland vegetation suited to the site's soil, rainfall and hydrology.
  • Restore marsh, swamp, reedbed and wetland margins where these habitats were temporarily disturbed, while avoiding drainage patterns that dry or fragment them.
  • Create broad, connected areas of dense ground cover with some flattened vegetation and concealed pathways, because roosting and nesting occur on or near the ground.
  • Do not replace suitable open grassland with dense tree planting, plantations or structures that reduce open hunting space unless required by the approved rehabilitation design.
  • Use local provenance seed or tubestock and obtain advice from the relevant land manager on appropriate native grass and wetland species, because the supplied sources do not name Australian restoration species.

Rehabilitation actions: Retain shelter and fauna features

  • Leave suitable logs, rocks, tussocks and natural ground cover in place where they do not create a safety or fire hazard.
  • Reinstate displaced logs, rocks and grass tussocks in connected retained habitat after construction, rather than scattering them across isolated patches.
  • Do not install nest boxes as a substitute for ground habitat, because the supplied sources describe this owl nesting on bare sand beneath dense grass rather than in tree hollows.
  • Reinstate safe wetland access and shallow vegetated margins where these features supported prey and cover before disturbance.

Rehabilitation actions: Weeds, predators and fire

  • Control weeds that replace native tall grass, simplify wetland cover or block movement between retained habitat patches.
  • Manage cats, foxes and other introduced predators in accordance with the land manager's approved conservation program, particularly near roosting and nesting habitat.
  • Prepare a site-specific fire plan with the land manager, retaining unburnt refuge areas and avoiding fire through occupied roosting or nesting cover.
  • Use rainfall, vegetation condition and owl observations to decide when rehabilitation areas are suitable for controlled maintenance, rather than applying a fixed burn interval not supported by the supplied sources.

Rehabilitation actions: Success measures and monitoring

  • Monitor plant establishment, native ground-cover density, wetland condition, weed cover, connectivity and evidence of roosting or hunting.
  • Use the same mapped routes and observation methods through the rehabilitation period so results can be compared with pre-clearing records.
  • Treat repeated owl detections, use of restored cover, stable wetland vegetation and reconnection with retained habitat as positive indicators, while recognising that absence from a visit does not demonstrate failure.
  • Set the monitoring duration, frequency and numerical performance targets through the approval, rehabilitation plan and advice from the relevant state or territory authority.

Sources