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Lakeland Downs Mouse (Leggadina lakedownensis)

The Lakeland Downs Mouse is a small, mostly nocturnal Australian rodent found across northern Australia, from Cape York to the Pilbara. It can occur in sandy and clayey grasslands, shrublands, woodlands and seasonally inundated areas, so it may be encountered during clearing and construction works. In Western Australia it is listed as Priority 4, and it is treated as an EVNT species for project planning. Near threatened equivalents apply in Queensland, South Australia and Tasmania under the relevant state arrangements.

Conservation status

Western Australia, WA Threatened and Priority Fauna List: Near threatened. Priority 4 (rare, near threatened) on the Western Australian priority fauna list. Priority species are not listed under the Biodiversity Conservation Act 2016 but should be considered in assessments.

Breeding season

The Lakeland Downs Mouse breeds from April to October on Thevenard Island, with breeding closely linked to previous rainfall. Timing may differ across mainland regions, so do not apply this window rigidly outside Thevenard Island.

Breeding mode: A mammal that gives birth to live young.

Breeding period: April to October on Thevenard Island.

Rainfall trigger: Breeding is highly synchronised with previous rainfall events.

Oestrous cycle: Approximately seven days.

Gestation: Approximately 30 days.

Litter size: Up to four young may be weaned at one time.

Breeding sites and weaning: Breeding-site details and the timing of weaning are not recorded. The species shelters in burrows during the day.

Breeding timing is known from Thevenard Island only and may shift between years or regions in response to rainfall, so surveys and clearing controls should be adjusted to local rainfall and recent records.

  • Breeding and births: Breeding is documented from April to October on Thevenard Island, but monthly peaks in mating or births are not known.
  • Dependent young: Dependent young may occur during the breeding period, although monthly birth and weaning timing is not recorded.
  • Nocturnal activity: The species is usually nocturnal and is most likely to be detected during night surveys, with activity affected by rainfall and food availability.
  • Daytime burrow sheltering: During the day, individuals shelter in burrows that help reduce heat exposure and water loss.
  • Highest clearing risk: Avoid unnecessary clearing from April to October where the species or suitable habitat is present, and inspect habitat before works because breeding places are not well documented.

Identification: Appearance and size

The Lakeland Downs Mouse is a small, short-tailed native rodent. It is generally quiet and may be missed during daytime checks, particularly when conditions are dry or hot.

The dorsal fur is light grey-brown and grades to a pure white belly. The snout is blunt, the ears are short and often surrounded by dorsal hairs, and the feet are white and slender.

The tail is shorter than the head and body. Head and body length is 60 to 75 mm, tail length is 40 to 45 mm, and weight is 15 to 40 g. Thevenard Island animals can be up to twice the size of mainland animals.

Head and body: 60 to 75 mm

Tail: 40 to 45 mm

Weight: 15 to 40 g

Identification: Calls and similar species

No diagnostic call or echolocation information is available for this species. No specific similar species are identified in the available field information.

Use a suitably experienced fauna ecologist or mammal specialist where a small rodent cannot be identified confidently in the field. Handle and release animals in accordance with the project fauna procedure and relevant permits.

Identification: Field signs

The species uses burrows for daytime shelter, but its burrows are not described well enough to identify reliably from the entrance alone. A burrow record should be treated as potential habitat evidence rather than a confirmed species record.

Droppings, nests, odour, stains and distinctive calls are not described as reliable diagnostic signs. Record photographs, location, habitat and any captured or observed animal details.

  • Look for small native rodent activity around grass cover, shrub bases, sandy soils and cracking or clayey ground.
  • Record active or recently used burrows without disturbing them.
  • Do not assume that an unoccupied burrow belongs to the Lakeland Downs Mouse.

Distribution: Australian range

The Lakeland Downs Mouse occurs across northern Australia. Its distribution is scattered, and Pilbara populations are considered genetically different from populations elsewhere in northern Australia.

The species extends from Cape York in Queensland across northern Australia to the Pilbara in Western Australia. It is recorded in the Northern Territory, Queensland and Western Australia.

In Western Australia, the species occurs in the Kimberley and Pilbara regions. Thevenard Island supports a population, and animals from that population have been translocated to Serrurier Island.

  • Northern Queensland, including the Cape York region.
  • Northern Territory.
  • Kimberley and Pilbara, Western Australia.
  • Thevenard Island and the translocated population on Serrurier Island.

Distribution: Records on works sites

A site may fall within the species range even where recent local records are absent. In Pilbara assessments, the species has been considered likely to occur where suitable habitat is present, including at the south-western edge of its range.

Absence from a short survey does not reliably exclude the species. Detection can be reduced by dry conditions, below average rainfall and low fauna activity.

  • Check current fauna databases and nearby survey records before clearing.
  • Treat suitable habitat as potential habitat until a competent survey has assessed it.
  • Give particular attention to sites connected to seasonally inundated areas, creeklines, sandy-clay plains and northern grassland or shrubland habitats.

Distribution: Overseas range

The Lakeland Downs Mouse is an Australian species. No overseas range is recognised in the available distribution information.

Habitat: Vegetation and landforms

The species occupies a broad range of northern Australian environments, but populations are often scattered. On a project site, focus on soil, drainage and ground cover rather than vegetation type alone.

Recorded habitats include tropical tussock grasslands, semiarid spinifex grasslands, sedgelands, samphire, Acacia shrublands, tropical Eucalyptus woodlands and Melaleuca woodlands. The species may also occur in stony ranges and savannah woodlands.

In the Pilbara, look for stony hummock grasslands, Mulga shrublands and woodlands, Acacia shrublands and vegetation on alluvial clay or sandy soils.

  • Tussock grasslands and spinifex grasslands.
  • Acacia, Mulga, Eucalyptus and Melaleuca vegetation.
  • Sedgelands, samphire and tropical coastal vegetation.
  • Stony ranges, creeklines, alluvial plains and colluvial plains.

Habitat: Soils and drainage

The species tends to occur on seasonally inundated areas with red or white sandy-clay soils. It is also associated with cracking clays and sandy soils, including deep sandy soils on Thevenard Island.

Map low-lying areas, drainage lines, flood-prone ground and soil changes before access tracks, pads or clearing are designed.

  • Seasonally inundated ground.
  • Red or white sandy-clay soils.
  • Cracking clay and alluvial soils.
  • Deep sandy soils beneath Acacia shrublands or low shrubs.

Habitat: Site assessment

Habitat quality will vary with rainfall, ground cover and disturbance. Pastoral activity, weeds and altered fire regimes can reduce the suitability of ground-dwelling fauna habitat.

Retain connected patches of native ground cover where practicable. Avoid unnecessary disturbance to creeklines, low-lying areas, shrub bases and areas with burrow activity.

  • Walk proposed clearing footprints, access routes and laydown areas before works.
  • Mark habitat features that can be retained or avoided.
  • Include potential habitat in the project fauna risk assessment, even when the species has not been recorded locally.

Foraging habitat: Food resources

The Lakeland Downs Mouse forages on the ground and is mainly active at night. Its diet is best documented on Thevenard Island, where it changes with seasonal conditions.

On Thevenard Island, the species eats a mixture of invertebrates and plant material. Invertebrates make up a greater part of the diet during dry periods when plant water content is low.

The diet of mainland populations is less well documented. Retain native ground cover, leaf litter and shrub structure that support invertebrates and plant foods.

  • Native grasses and other plant material.
  • Leaf litter and ground vegetation.
  • Invertebrates associated with soil, litter and dense ground cover.

Foraging habitat: Foraging places

Potential foraging habitat includes tussock and spinifex grasslands, sedgelands, samphire, Acacia shrublands, Mulga and Eucalyptus woodlands. Seasonally inundated sandy-clay areas and creekline vegetation may also provide suitable resources.

The species may reside or forage in Mulga shrublands and woodlands in the Pilbara, including built-up grasslands.

  • Areas with continuous native ground cover.
  • Shrubland and woodland floors with litter and grass cover.
  • Alluvial, colluvial and creekline habitats with seasonal productivity.

Foraging habitat: Practical controls during works

Limit clearing to the approved footprint and keep vehicle movement on defined routes. Avoid unnecessary removal of grass tussocks, low shrubs, litter and fallen cover.

Manage lighting, dust, weeds and introduced predators around retained habitat. These controls help maintain feeding resources and reduce disturbance to nocturnal fauna.

  • Stage clearing so fauna can move away from active work areas.
  • Inspect vegetation and ground cover before slashing or grading.
  • Keep spoil, materials and machinery out of retained habitat.

Breeding habitat: Breeding period

Breeding information is limited and is documented most clearly for the Thevenard Island population. Project teams should assume that suitable ground habitat may support breeding at other locations when conditions are favourable.

On Thevenard Island, breeding occurs from April to October and is highly synchronised with previous rainfall. Timing may differ between regions and has not been established across the full Australian range.

Avoid unnecessary disturbance to suitable habitat during periods of increased activity after substantial rainfall, where the program allows.

Thevenard Island breeding period: April to October

Oestrous cycle: Approximately seven days

Gestation: Approximately 30 days

Young: Up to four young may be weaned at one time

Breeding habitat: Breeding places

A specific breeding-site description is available only for Thevenard Island, where breeding habitat includes Acacia shrublands and low shrubs on deep sandy soils. The species shelters in burrows, so burrows and dense ground cover should be treated as potentially significant habitat.

Do not fill, collapse or disturb burrows during site preparation. Have an ecologist assess burrows or occupied habitat before clearing.

  • Acacia shrublands and low shrubs on deep sandy soils.
  • Dense native ground cover near burrows.
  • Seasonally productive grassland, shrubland and woodland floors.

Breeding habitat: Clearing controls

The species is small and may remain underground during daylight hours. A daytime inspection alone may not detect animals or breeding activity.

Use a staged clearing approach and ensure fauna spotter catchers understand the habitat indicators. Stop work and seek ecological advice if a live animal, occupied burrow or dependent young is found.

  • Brief operators before clearing begins.
  • Retain habitat outside the approved footprint.
  • Check excavations, trenches and stockpiles for trapped fauna each day.
  • Use fauna handling and release procedures approved for the project.

Sheltering habitat: Burrows and daytime shelter

The Lakeland Downs Mouse is usually nocturnal and uses burrows to shelter from heat and conserve water. Radio tracking on Thevenard Island recorded different burrows being used on different nights.

Burrows provide refuge during the day and may be important in hot, dry conditions. The species may occur in sandy soils, cracking clays, alluvial ground and areas with grass, shrub or woodland cover.

Burrow dimensions, entrance form and nesting structure are not sufficiently described to support a reliable field identification.

  • Inspect ground disturbance and proposed clearing areas for burrow activity.
  • Protect burrows from vehicle traffic, grading, trenching and spoil placement.
  • Keep retained vegetation and soil structure around potential shelter areas where practicable.

Sheltering habitat: Nocturnal activity

The species is nocturnal on Thevenard Island and is generally described as nocturnal in the Pilbara. Daytime observations are therefore unlikely to represent its full use of a site.

Different burrows may be used across successive nights. A single empty burrow should not be interpreted as evidence that the site is unused.

Thevenard Island home range: Average of 5.3 hectares

Burrow use: Different burrows were used on different nights during radio tracking

  • Schedule targeted ecological checks around suitable habitat when conditions and approvals allow.
  • Use trapping or motion-sensor cameras where a qualified ecologist considers them appropriate.
  • Interpret negative results cautiously after dry weather or below average rainfall.

Sheltering habitat: Island populations

Thevenard Island animals use Acacia shrublands and low shrubs on deep sandy soils. The translocated Serrurier Island population should also be treated as sensitive to disturbance and introduced predators.

House mice occur on Thevenard Island and may compete with the Lakeland Downs Mouse for food and shelter.

  • Avoid introducing or spreading rodents through equipment, materials or waste.
  • Keep food and refuse secured at island work sites.
  • Report unusual rodent activity to the project ecologist.

Threats: Clearing and fragmentation

The Lakeland Downs Mouse has a scattered distribution and several pressures can be increased by development or land management. Controls should be scaled to the habitat affected, the likelihood of occurrence and the Western Australian Priority 4 status.

Mining, horticulture, roads, pads and associated infrastructure can remove or divide grassland, shrubland, woodland and seasonally inundated habitat. Clearing can also remove burrows and reduce access to feeding resources.

Keep the disturbance footprint as small as practicable and retain connected native habitat, especially around creeklines, alluvial plains and low-lying areas.

  • Use existing tracks and previously disturbed areas where practicable.
  • Clearly mark no-go areas before machinery enters the site.
  • Avoid clearing outside the approved footprint.
  • Rehabilitate temporary disturbance with appropriate local native vegetation and ground cover.

Threats: Feral predators and competing rodents

Feral cats are identified as a severe threat. House mice may suppress native mouse populations on Thevenard Island through competition for food and shelter.

Do not attract feral animals with unsecured food, waste or water. Island projects should include strong rodent hygiene and monitoring controls.

  • Secure food, feed and waste.
  • Inspect incoming freight and equipment for rodents where island work is proposed.
  • Report feral cat activity and unusual introduced rodent abundance.
  • Support approved pest management programs where they are in place.

Threats: Fire, grazing and weeds

Inappropriate fire regimes can reduce habitat quality. Feral herbivores can degrade habitat and resources, while grazing pressure and weeds can reduce native ground cover used for shelter and foraging.

Plan fire, weed and grazing management around the retention of native grass, shrub and litter structure.

  • Avoid broad disturbance to native ground cover.
  • Prevent weed spread on vehicles, machinery and fill.
  • Use fire planning that protects retained habitat and avoids repeated loss of ground cover.
  • Control feral herbivore impacts where required by the land manager.

Threats: Climate and dry conditions

Climate change may affect rainfall, food availability, breeding and population persistence. Dry conditions can also reduce activity and make the species harder to detect during surveys.

A failure to record the species during a dry survey should not be treated as proof that it is absent. For a Priority 4 species, document habitat, survey conditions and any limitations clearly, and seek targeted ecological advice where clearing may affect suitable habitat.

  • Record rainfall and recent weather when interpreting survey results.
  • Use habitat assessment alongside trapping or camera results.
  • Monitor retained habitat where the project has ongoing disturbance or operational impacts.
  • Review controls if the species is detected or if habitat conditions change.

Survey methodology: 1. Desktop assessment

The Lakeland Downs Mouse is nocturnal, generally rare and patchily distributed. Survey success can fall in dry conditions, so plan work around suitable weather and use more than one detection method where habitat is suitable.

Map potential habitat before entering the site. Include seasonally inundated areas, sandy-clay soils, alluvial plains, creeklines, tussock or spinifex grasslands, Acacia shrublands, woodlands, sedgelands and samphire.

Check records within and around the project area, especially in the Pilbara, Kimberley and the south-west edge of the range. Treat the species as potentially present where suitable habitat connects with known records.

Prioritise habitat that may be retained after construction, as well as areas proposed for clearing, access tracks, laydown areas and temporary works.

  • Confirm the relevant state listing and approval pathway before fieldwork.
  • In Western Australia, treat Priority 4 status as a monitoring and impact-management trigger, even though it is not a statutory threatened species category.
  • In Queensland, check whether the species is treated as protected near threatened wildlife and whether disturbance to a breeding place requires a species management program.

Survey methodology: 2. Trapping and camera surveys

Use systematic trapping in representative habitat. Suitable equipment can include Elliott traps, funnel traps and pitfall traps, with appropriate shade, shelter and animal welfare measures.

A published Pilbara assessment used seven consecutive nights at each site. Eight sites were surveyed, with 364 trap nights per site. This provides a useful example for a targeted project survey, but effort should be increased where habitat is extensive, fragmented or difficult to sample.

Use motion-sensor cameras at likely runways, creeklines, shelter areas and other places where small mammals may pass. A published assessment used two cameras per site for seven consecutive nights, with additional cameras used across a wider survey area.

Use radiotracking only where animals have been captured under an approved study design and tracking is needed to understand burrow use, movements or home ranges.

  • Run trapping and camera surveys during the night and check traps early each morning.
  • Avoid relying on a single dry-season survey. Below-average rainfall can reduce activity, abundance, trapping success and detection.
  • Keep pitfall and funnel traps shaded, provide suitable protection from heat, and check them frequently enough to meet animal welfare requirements.
  • Record trap type, trap nights, camera nights, weather, recent rainfall, habitat, soil, vegetation structure and any evidence of cats, house mice, feral herbivores or fire effects.

Survey methodology: 3. Timing and survey conditions

On Thevenard Island, breeding occurs from April to October and is strongly associated with previous rainfall. Use this period and post-rain conditions as preferred windows where logistics allow, while recognising that timing may vary across the mainland range.

There is no established migration pattern for this species. Survey planning should focus on local habitat condition, rainfall and access to shelter rather than expected seasonal passage.

Record whether conditions were dry, recently wet, hot, windy or affected by fire, grazing or other disturbance. Explain how these conditions may have affected detection.

  • Repeat surveys when the first survey occurs after below-average rainfall or produces limited trapping activity.
  • Use consistent site locations and methods when comparing results between survey rounds.
  • Record all captures, photographs, tracks, burrows, carcasses and reliable observations, including negative results and survey limitations.

Before habitat disturbance: 1. Avoidance, approvals and permits

Avoid clearing suitable habitat wherever practicable. The species is sparsely distributed and poorly known, so project decisions should retain connected habitat and reduce disturbance to shelter and foraging areas.

Confirm whether the project needs an EPBC Act referral or approval before works begin. The Lakeland Downs Mouse is not shown as nationally listed in the current Western Australian listing information, but other project matters or listed species may still trigger Commonwealth requirements.

Obtain state approvals and fauna permits required for trapping, handling, marking, radiotracking, relocation or euthanasia. Use only people authorised under the relevant state law and project approval.

In Queensland, confirm whether a species management program is required if works may tamper with a breeding place. Follow the approved program and any conditions before clearing starts.

In Western Australia, manage the species as a Priority 4 fauna matter. Seek advice from the relevant land manager or conservation authority where clearing may affect records, island populations, important habitat or connected habitat.

  • Document the decision pathway, approvals, permit numbers, conditions and responsible contacts.
  • Keep the footprint as small as practicable and avoid seasonally inundated areas, creeklines, sandy-clay plains and dense grass or shrub habitat where alternatives exist.
  • Do not assume that a lack of recent records means the species is absent.

Before habitat disturbance: 2. Pre-clearance survey and habitat inspection

Complete a pre-clearance inspection shortly before works. Search for live or dead mice, burrow entrances, runways, tracks, pellets, feeding signs and shelter beneath vegetation or debris.

Use trapping or cameras where the desktop assessment identifies suitable habitat and the risk of harm cannot be resolved by inspection alone. Do not excavate or collapse burrows during the inspection.

Pay particular attention to habitat that has received recent rainfall and to areas adjoining known records or retained vegetation.

  • Mark records, burrows and habitat patches on plans and in the field.
  • Check whether clearing may affect breeding habitat or a breeding place. The species uses burrows for daytime shelter, but specific breeding-site features are not well understood.
  • Set out no-go areas before machinery arrives and verify them with the spotter catcher and supervisor.

Before habitat disturbance: 3. Timing, buffers and exclusion

There are no species-specific clearing buffers established for this mouse. Set buffers through the project risk assessment, using the habitat footprint, records, burrow locations, construction risk and approval conditions.

Avoid clearing during periods of high breeding likelihood where practicable, particularly April to October on Thevenard Island and after rainfall events that may stimulate breeding. Obtain local advice for mainland sites.

Use exclusion fencing only where it will not trap animals inside the work area or prevent access to retained habitat. Fence design and placement must be checked by the fauna supervisor.

  • Retain habitat links between suitable patches wherever possible.
  • Do not place spoil, equipment, lighting towers or access tracks over burrows, creeklines or retained shelter habitat.
  • Inspect exclusion fencing daily while it is active and repair gaps promptly.

Before habitat disturbance: 4. Induction and readiness

Induct all workers on the mouse, its appearance, nocturnal habits, likely habitat and the stop-work process. Include photographs or an approved identification guide in the site induction.

Make sure the fauna spotter catcher has authority to stop work and can contact the site supervisor, environmental manager and wildlife carer or veterinarian.

Prepare clean containers, soft cloth bags, shade, water and approved transport equipment before clearing starts. Do not improvise animal handling equipment during an incident.

  • Tell workers never to handle a mouse, open a burrow or move debris containing an animal.
  • Display the reporting chain and emergency contacts at crib rooms, site offices and work fronts.
  • Brief operators on the limits of clearing and the location of no-go areas before each shift.

During habitat disturbance: 1. Sequential clearing

Clear habitat in a controlled sequence and keep the fauna spotter catcher at the work face. Stop work whenever an animal, burrow or possible breeding place creates an uncertainty that cannot be resolved immediately.

Clear in stages from the least disturbed edge towards retained habitat, where this is safe and appropriate. This gives mobile animals an opportunity to move away from machinery.

Use low-impact methods around marked habitat, burrows, dense grass, debris and creeklines. Remove loose materials progressively so animals are not crushed or trapped.

Keep machinery out of retained habitat and maintain a clear view for the fauna spotter catcher.

  • Start each shift with a check of the work area, exclusion fencing, burrows and weather conditions.
  • Stop clearing during extreme heat or other conditions that increase animal welfare risk unless the approved method specifically addresses those conditions.
  • Do not burn, flood, poison or fumigate burrows or shelter areas.

During habitat disturbance: 2. Spotter catcher authority and handling

Give the fauna spotter catcher authority to stop work immediately. The authority must apply to all clearing, grading, trenching, drilling, vehicle movement and removal of vegetation or debris.

Only authorised and suitably trained people may capture, handle, examine, transport or release the mouse. Keep handling brief and quiet, and protect animals from heat, direct sun, noise and domestic or feral predators.

Release a healthy animal only under the approved method and at an appropriate nearby location with suitable shelter. Do not move animals long distances or across unsuitable habitat without approval.

  • Use a secure, ventilated container or cloth bag suitable for a small mammal.
  • Record the capture location before moving the animal.
  • Do not give food, medication or water by mouth unless directed by a qualified wildlife veterinarian or approved wildlife carer.

During habitat disturbance: 3. Breeding places, burrows and other discoveries

If an active breeding place, occupied burrow, dependent young, group, colony or other suspected breeding site is found, stop work around it. Establish a temporary exclusion area based on the site risk and do not disturb the feature while advice is obtained.

Notify the fauna supervisor and environmental manager immediately. Follow the relevant approval, species management program, permit and regulator requirements before work resumes.

Do not fill, collapse, relocate or modify a burrow or breeding place unless the approved procedure specifically permits it and an authorised person is supervising.

  • Photograph and map the feature without entering or damaging it.
  • Record signs of occupation, the surrounding habitat, weather, date and time.
  • Extend the exclusion area if machinery, vibration, dust, lighting or traffic could affect the animal.

During habitat disturbance: 4. Injured or dead animals

Place an injured animal in a secure, quiet, temperature-controlled container and contact the nominated wildlife carer or veterinarian. Minimise handling and do not delay transfer while waiting for a routine project decision.

Treat a dead animal as a reportable fauna incident. Do not dispose of it until the fauna supervisor has confirmed whether collection, identification or testing is required.

If a cat, dog, house mouse infestation or other predator is involved, secure the immediate area and report the threat for control.

  • Record the exact location, condition, likely cause, photographs and people involved.
  • Keep injured or dead animals away from machinery, food areas and unauthorised personnel.
  • Follow permit and approval conditions for transport, rehabilitation, release or specimen retention.

After habitat disturbance: 1. Post-clearance checks

Close out each work area with a fauna check and a clear record of what occurred. Monitoring effort should match the risk, the listing context and the quality of the pre-clearance information.

Inspect the cleared area, retained vegetation, exclusion fencing, trenches, spoil heaps and access routes after clearing. Look for trapped animals, fresh burrow disturbance, carcasses and animals sheltering beneath materials.

Keep trenches and pits covered or fitted with fauna escape measures when unattended, subject to the project fauna management plan. Inspect them at the required frequency and before backfilling.

Remove temporary materials that could trap small mammals once they are no longer needed.

  • Complete a fauna check before machinery leaves each work front.
  • Record the date, personnel, area checked, findings and any corrective action.
  • Escalate repeated discoveries, mortality or evidence of animals remaining inside the work area.

After habitat disturbance: 2. Relocation and release follow-up

Track every relocated animal from capture through release. Record the release site, habitat condition, time, method, permit and any identifying mark used under the approved study design.

Release animals into suitable nearby habitat with shelter and access to natural food resources. Avoid release into active construction areas, isolated habitat fragments or areas with obvious predator pressure.

Where relocation is used, monitor for welfare issues and unexpected returns to the work area. Relocation should not replace avoidance of occupied habitat.

  • Use the smallest practical movement distance unless an approved plan requires otherwise.
  • Do not release animals on private land, islands or conservation reserves without the required landholder or authority approval.
  • Report failed releases, repeat captures and mortality to the project environmental manager.

After habitat disturbance: 3. Monitoring and reporting

Use repeat cameras, trapping or targeted inspections where the project affects retained habitat, known records or an important population. On Thevenard Island and Serrurier Island, maintain monitoring because island populations are a specific management focus.

Compare results with pre-clearance records and account for rainfall, fire, grazing, cats, house mice and other factors that may change detection or abundance.

Prepare a completion report that separates animals recorded, animals handled, breeding-place findings, survey effort, habitat cleared and incidents.

  • Include trap nights, camera nights, survey dates, weather and recent rainfall.
  • Map all records and retained habitat in the project geographic information system.
  • Submit records to the relevant land manager, regulator or fauna database where required by approval conditions.

After habitat disturbance: 4. Incident review

Review every injury, death, unauthorised clearing event, breeding-place disturbance and repeated detection failure. Identify whether the cause was design, supervision, equipment, timing, induction or communication.

Update the clearing method, exclusion measures and induction before the next work front starts.

Escalate patterns of mortality or habitat loss to the project ecologist and relevant authority, especially where the project is in Priority 4 habitat or near a known population.

  • Keep a corrective-action register with an owner and completion date.
  • Discuss lessons learned at the next pre-start meeting.
  • Retain photographs, maps, permits, forms and correspondence with the project environmental records.

Rehabilitation actions: 1. Habitat restoration

Rehabilitation should restore the ground conditions and vegetation structure used by the Lakeland Downs Mouse. Focus on connected native habitat, shelter and predator control rather than artificial structures that do not match its known ecology.

Restore sandy-clay and alluvial surfaces, creekline margins, grasslands, Acacia shrublands and woodland edges where these habitats were disturbed.

Retain and replace native topsoil, litter, coarse woody material and suitable surface shelter where this can be done without spreading weeds or disease.

Re-establish locally appropriate native grasses, sedges, shrubs and woodland species. Shape drainage so that natural seasonal inundation is maintained without creating erosion or permanent waterlogging.

  • Use local provenance seed and tubestock where practicable.
  • Avoid compacting soil in retained or rehabilitated habitat.
  • Keep rehabilitation connected to existing native vegetation rather than creating isolated small patches.

Rehabilitation actions: 2. Burrows, shelter and artificial structures

Protect natural burrows and shelter features during rehabilitation. The mouse is known to use burrows for daytime shelter and may use different burrows between nights.

Do not install nest boxes, bat boxes, artificial nest sites or roost structures as a default measure. These structures are designed for other fauna groups and are not established replacement habitat for this mouse.

Where a project has destroyed an occupied burrow or approved breeding place, obtain species-specific advice before considering an artificial replacement. Any design must be approved, monitored and maintained under the relevant permit or management plan.

  • Replace natural ground cover and shelter before removing temporary exclusion measures.
  • Keep rehabilitated areas free of loose materials that can collapse burrows or trap animals.
  • Do not create artificial water points unless they are justified by the rehabilitation plan and designed to avoid predator concentration, drowning and disease.

Rehabilitation actions: 3. Weeds, predators and fire

Control weeds during establishment and prevent weed invasion from construction areas, haul roads and stockpiles. Maintain native ground cover rather than leaving bare soil.

Manage feral cats and house mice where they threaten the local population, with particular attention to island populations and sites with evidence of competition or predation.

Plan fire management with the land manager. Avoid inappropriate fire regimes that remove shelter and simplify grass or shrub structure.

  • Inspect rehabilitation after rainfall and after fire for erosion, weeds and loss of cover.
  • Keep food waste and construction materials away from rehabilitation areas to avoid attracting predators.
  • Use approved, humane and target-specific pest control methods.

Rehabilitation actions: 4. Long-term monitoring

Monitor vegetation establishment, soil stability, shelter, weeds, predator activity and mouse use of rehabilitated habitat. Use cameras and targeted trapping where permits and animal welfare requirements allow.

Continue monitoring through contrasting rainfall conditions. A single dry survey may underestimate use because activity and detection can decline when conditions are poor.

Compare rehabilitated areas with nearby retained reference habitat and adjust weed, fire, predator or access management when outcomes are below target.

  • Set monitoring objectives and methods before rehabilitation begins.
  • Record rainfall, fire, grazing, predator control, survey effort and all mouse detections.
  • Maintain monitoring for the period required by approval conditions and extend it where results show continuing risk to the population.

Sources