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Collared Delma (Delma torquata)

The Collared Delma is a small, legless pygopodid lizard found mainly in fragmented populations across south-east Queensland. It shelters beneath rocks, coarse woody debris, leaf litter and other ground refuges, so clearing, rock removal, ground disturbance, grazing, fire and weed invasion can directly remove habitat on development sites.

Conservation status

Commonwealth, EPBC Act 1999: Vulnerable.

Queensland, Nature Conservation Act 1992: Vulnerable.

Breeding season

Collared Delmas lay two eggs in December, with hatching in late February to early March. Surface activity and pitfall captures are highest from spring to late summer, but animals remain beneath refuges in all seasons, so clearing can cause harm year round.

Reproductive mode: Egg laying

Clutch size: Two small, white, elongated eggs

Incubation: Eggs are laid in December and hatch in late February to early March. Incubation length is not recorded.

Size at hatching or birth: Not recorded

Age at maturity: 24 to 36 months reported

Nest or egg sites: Not recorded

Breeding frequency: Not recorded

Confirm timing locally before clearing, and adjust survey and relocation work for rainfall, soil moisture and warm conditions, especially when maximum temperatures exceed 25°C.

  • Mating: Mating dates are not recorded for this species. As a planning window, treat September to November as a possible lead-up to December egg laying, not as a confirmed mating season.
  • Gravid females: The timing of gravid females is not recorded. For clearing planning, treat females as potentially carrying eggs in the months before the documented December laying period.
  • Egg laying: Two small, white, elongated eggs are laid in December. The egg-laying substrate or nest site has not been described.
  • Incubation: Eggs are laid in December and hatch in late February to early March. Incubation length and the location of eggs in soil or other substrates are not recorded, so December to March is the precautionary egg period.
  • Hatchlings: Hatching is reported for February to March, with the more specific account placing it in late February to early March. Juvenile emergence and the period when hatchlings are most abundant are not recorded.
  • Active period: Adults are diurnal and are captured in pitfall traps from spring through to late summer, approximately September to February. Activity and captures are highest from October to February, with four of six captures in one study occurring in December.
  • Winter inactivity: Brumation and a defined winter inactivity period are not recorded. June to August is a precautionary lower-surface-activity window based on the documented spring to late summer capture period, when animals may remain beneath rocks, litter, logs, grass tussocks or soil and cannot escape machinery.
  • Highest clearing risk: Risk is highest from October to March because peak surface activity overlaps December egg laying, the December to March egg period and February to March hatching. Clearing can harm Collared Delmas in every month by removing or displacing refuges used beneath rocks, logs, litter, grass tussocks, termite holes and soil.

Identification

The Collared Delma is a slender, legless lizard with a distinctive patterned head and neck. Identification can be difficult where other Delma species or burrowing skinks occur, particularly for inexperienced observers.

The supplied sources do not provide a confirmed adult body length, weight or sex-specific field characters for the Collared Delma. It has a slender, limbless body and resembles other small to medium Delma species and some burrowing skinks.

The head has dark markings separated by narrow pale bands across the top of the head and neck. The throat has dark marbling and the belly is greyish.

Body size: A confirmed size range is not provided in the supplied documents.

Weight: Not reported in the supplied documents.

Sex differences: No reliable sex-specific field differences are reported.

Identification: Distinguishing features

The Collared Delma can be confused with Delma inornata, Delma plebeia and Delma tincta. It differs from D. inornata and D. tincta by its dark throat marbling, head and neck markings, and greyish belly. D. inornata and D. tincta have paler bellies, while D. plebeia lacks the narrow pale bands across the head and neck.

The Collared Delma has two preanal scales. D. inornata and D. tincta generally have three. A hand lens or microscopic examination may be needed, especially for juveniles or damaged specimens.

Burrowing skinks may have a similar limbless body shape, but they lack the Collared Delma's characteristic head markings. Records from outside the known range should be supported by clear photographs and, where necessary, expert or museum confirmation.

Identification: Field signs and handling

There are no reliable tracks, calls, scats, nests, sloughs or eyeshine records described in the supplied sources. Detection is primarily by finding live animals beneath suitable refuges or in pitfall traps.

Individuals have been found beneath stones, coarse woody debris, leaf litter and within thick grass tussocks. Some have sheltered in termite holes when disturbed. Recent records have also been obtained by raking fine flood-washed humus, surface soil beneath litter and debris.

Replace every rock, log and other refuge in its original position after inspection. Rock turning can temporarily reduce use of refuges, with lower capture rates reported for up to three months after disturbance at previously searched sites.

Distribution: National range

The Collared Delma is endemic to eastern Australia and is known primarily from Queensland. Records are scattered, and the species may be more widespread than current records indicate.

Most records are from south-east Queensland, including the western suburbs of Brisbane, the Bunya Mountains, the Toowoomba Range, Western Creek near Millmerran and inland areas extending west towards Roma and Mitchell.

Other reported localities include Blackdown Tableland National Park, Bullyard Conservation Park, D'Aguilar Range National Park, Expedition National Park, Naumgna and Lockyer Forest Reserves. The distribution may extend into northern New South Wales, but this is not confirmed in the supplied sources.

Confirmed state range: Queensland.

Possible additional state: New South Wales, near the Queensland border, not confirmed in the supplied sources.

Natural resource management regions: South East Queensland, Condamine, Burnett Mary and Fitzroy regions.

Distribution: Strongholds and subpopulations

The western Brisbane area has the strongest documented concentration of records. Brisbane localities include Mt Crosby, Pullenvale, Colleges Crossing, Karana Downs, Upper Brookfield, Kenmore, Moggill State Forest, Anstead Bushland Reserve, Hawkesbury Road, Woodcrest Estate and Pinjarra Hills.

The species occurs in small, isolated subpopulations. A major study at Mt Crosby recorded 39 specimens over two years. This is a survey result, not an estimate of the total population.

Documented Mt Crosby result: 39 specimens recorded over two years from 1993 to 1995.

Typical reported occupied patch: Approximately 1 ha, based on records summarised in the 2024 monitoring overview.

Population trend: A reliable national population size and trend are not available. The species is described as highly fragmented and threatened by ongoing habitat loss and degradation.

Habitat: Vegetation and soils

Collared Delmas occupy dry, open woodland and open forest with suitable ground refuges. Habitat can occur on rocky ridges and slopes, but records also come from alluvial and clay soils without obvious surface rock.

Recorded vegetation includes narrow-leaved ironbark woodland, forest red gum woodland, brigalow and belah forest with wilga, and alluvial poplar box woodland. Other habitat descriptions include dry open eucalyptus and acacia woodland and open forest.

The species has been recorded on stony lithosols, exposed quartzite ridges, basalt-derived podzolic soils, dark cracking clay, fine grey cracking clay and alluvial soils. The most westerly records were from poplar box woodland with no rock content.

Queensland land zones: Land zones 3, 9 and 10.

Examples of regional ecosystems: RE 11.3.2, 11.9.10, 11.10.1 and 11.10.4.

Elevation or climate limit: A defined elevation limit is not provided. Detection is better in warm, not overly dry conditions, generally when maximum temperatures exceed 25 degrees Celsius.

Habitat: Ground structure

Important ground features include rocks in contact with the soil, coarse woody debris, logs, bark, leaf litter and grass tussocks. A leaf litter layer of about 30 to 100 mm is commonly associated with suitable habitat.

Brisbane records indicate a preference for relatively open understorey, patchy native grasses and numerous small rocks. The 2024 monitoring overview also reports a preference at Mt Crosby for average rocks of about 172 cm and vegetation cover of about 31 percent, although these measurements should not be treated as universal habitat thresholds.

Suitable habitat may occur in disturbed areas, road reserves, travelling stock routes and narrow connections between larger patches. Habitat mapping should therefore not be restricted to intact remnant vegetation.

Foraging habitat: Food and feeding sites

The Collared Delma is an insectivorous, ground-active lizard. It forages during the day through low grass, leaf litter and debris close to shelter sites.

Captive animals have eaten cockroaches and small crickets. Subterranean termites may also be an important food source, particularly where termite nests or holes occur in the ground.

Individuals have been observed moving through low grass. They have also been found beneath rocks and coarse woody debris, in thick grass tussocks and in leaf litter, indicating that foraging habitat is closely linked to ground cover and shelter structure.

Diet: Invertebrates, including cockroaches, small crickets and possibly subterranean termites.

Foraging range: A species-wide foraging distance is not known. Recaptures within 18.2 to 20 m and repeated use of the same rocks suggest that some individuals have small home ranges.

  • Retain leaf litter, low native grass, coarse woody debris and termite-associated ground features within habitat patches.
  • Avoid broad removal of rocks or litter during clearing, slashing, grading and construction access works.
  • Maintain connected ground habitat between rocky ridges, woodland patches and other occupied or potentially suitable areas.

Breeding habitat: Breeding biology

Little breeding information is available. The best-supported account is based on observations and reproductive patterns recorded for the species and related pygopodids.

Breeding habitat is likely to be within the same dry woodland and open forest ground habitat used for shelter and foraging. Retention of stable rocks, litter, logs, grass tussocks, soil and termite-associated refuges is therefore important around breeding areas.

Avoid disturbing occupied habitat during the egg-laying period and while hatchlings are expected to be present. Do not assume that a site is unoccupied because animals are not visible on the surface.

Breeding season: Eggs are laid in December.

Clutch size: Two small white, elongated eggs.

Incubation or hatching: Eggs hatch in February to March.

Age at maturity: Not reported in the supplied documents.

Lifespan: Captive studies suggest a life expectancy of at least five years.

Nest site: A specific nest site or egg-laying substrate is not described.

Sheltering habitat: Known refuges

Sheltering habitat is concentrated at ground level. Refuges are easily removed or displaced during clearing, earthworks, fire management and construction access.

Collared Delmas have mostly been found beneath stones and coarse woody debris on soil. They also use mats of leaf litter, thick grass tussocks, termite holes, surface soil and fine flood-washed humus.

Suitable rocks are often weathered, loose and in contact with the soil. Brisbane records suggest a preference for many small rocks, generally less than 3 cm in some local habitat descriptions, while the Mt Crosby study reported a preferred average rock size of 172 cm. These measurements differ between sources and should be used as local indicators rather than fixed requirements.

The species can occur away from obvious rock outcrops. Pitfall captures in vegetation some distance from rocky areas show that ground cover, litter and coarse woody debris can provide shelter even where surface rock is sparse.

Leaf litter depth: Typically 30 to 100 mm in habitat descriptions from Brisbane.

Reported occupied patch: Often about 1 ha, with records from areas approximately 50 by 50 m.

Refuge disturbance response: Recent rock turning may reduce captures for up to three months at the affected site.

  • Inspect suitable rocks, logs, bark, litter mats, grass tussocks and termite holes before clearing.
  • Replace turned rocks and moved debris in the same position and orientation after inspection.
  • Retain shelter features within development buffers and along habitat connections, not only within mapped remnant vegetation.
  • Do not stockpile rocks, logs, mulch or cleared vegetation over potential habitat.

Threats: Clearing and construction

The main risk on development sites is the loss or degradation of small ground habitat patches and the connections between them. Because populations are fragmented and animals are difficult to detect, absence from a brief search should not be treated as proof that a site is unoccupied.

Clearing for housing, agriculture, roads, utilities and other infrastructure can remove woodland, rocks, litter, logs and soil refuges. Removing or altering surface rocks is a direct threat because the species is commonly found beneath them.

Fragmentation can isolate small subpopulations and remove movement connections between habitat patches. Suitable habitat may occur between grazed or cropped areas, along road reserves and on travelling stock routes, so these areas should not be dismissed without field assessment.

Ground disturbance can also compact soil, bury refuges, remove termite holes and alter the low grass and litter structure used for shelter and foraging.

  • Avoid locating infrastructure on known sites, rocky ridges, occupied ground refuges and habitat connections.
  • Complete targeted searches before clearing in suitable woodland and open forest, including non-remnant patches with rocks, logs, litter or grass tussocks.
  • Use clearly marked no-go areas for retained habitat and avoid moving rocks or coarse woody debris into construction compounds.
  • Have a qualified fauna ecologist or authorised spotter catcher manage any live capture, handling, identification and relocation required by the approval conditions.

Threats: Fire, grazing and weeds

Fire can remove the leaf litter layer and cause local population loss. Frequent or intense burning may also reduce recolonisation by removing stable ground refuges.

Overgrazing can degrade ground cover and may reduce habitat suitability. Brigalow Belt records were associated with ungrazed or rarely grazed areas.

Dwarf lantana can form dense mats over rocks. No Collared Delmas were found in some rocky ridges heavily covered by this weed, although the extent and cause of that effect require further study.

  • Avoid over-burning known or potential habitat and retain unburnt litter and refuge mosaics.
  • Control dwarf lantana and other groundcover weeds without removing rocks, litter or coarse woody debris unnecessarily.
  • Manage grazing so that native grass, litter and refuge structure are retained.

Threats: Predators, chemicals and other pressures

Predation has been reported or inferred from regenerated tails. Likely predators include cryptic snakes, and the 2024 overview also identifies feral cats and red foxes.

Fire ants may kill and eat small reptiles. Fire ant treatment may also reduce cockroaches and other prey, creating an indirect food-supply risk.

Agricultural chemicals are identified as a threat. Dust, spills, herbicide use and other construction chemicals should be prevented from entering retained litter, soil and shelter areas.

  • Keep construction chemicals, fuels, concrete washout, dust and sediment out of retained habitat.
  • Manage feral cats, foxes and fire ants in accordance with approved control programmes.
  • Avoid broad-spectrum chemical treatment in occupied or high-quality habitat unless the treatment has been assessed for effects on the lizard and its prey.

Survey methodology: 1. Map and inspect suitable habitat

Survey the Collared Delma, Delma torquata, before clearing where suitable habitat may be affected. The species is difficult to detect and a negative result is not reliable unless the search covers suitable microhabitat with appropriate methods, timing and effort.

Map the full disturbance area and nearby retained habitat before selecting survey points.

Search dry, open eucalypt or eucalypt-acacia woodland, open forest and Brigalow Belt vegetation, including rocky ridges, slopes, alluvial Poplar Box woodland and areas with coarse woody debris or deep leaf litter.

Give priority to habitat with rocks, logs, bark, termite nests, tussock grass and leaf litter that is typically 30 to 100 millimetres thick.

Do not exclude habitat solely because it lacks rocks. Records include subpopulations in eucalypt associations and alluvial Poplar Box woodland without rock content.

Typical habitat patch: Small isolated areas, often about 1 hectare, with some records from areas of approximately 50 by 50 metres.

Known distribution: South-east Queensland, including western Brisbane, the Bunya Mountains, Blackdown Tableland, Brigalow Belt areas and sites west towards Roma and Millmerran.

  • Record habitat condition, grazing, weeds, fire history, rock cover, coarse woody debris, leaf litter depth and connectivity to nearby suitable habitat.
  • Identify areas where pitfall installation will be unsafe or impractical because of dense rock or other ground constraints.

Survey methodology: 2. Active searching and raking

Undertake a thorough hand search under weathered loose rocks, coarse woody debris, logs, bark, mats of leaf litter and around tussock grass and termite holes.

Rake fine leaf litter, humus and surface soil carefully where these features are present.

Replace every rock, log and other refuge in its original position and orientation after inspection.

Use active searching as the primary method where suitable rocks and ground refuges are present, because it detected more Collared Delmas than pitfall trapping in the available field study.

Observed search yield: Approximately one lizard per 150 to 200 rocks turned, or one lizard per 1.75 hours of searching, in the Porter study.

Season: Animals can occur under rocks in all seasons, but pitfall captures and general activity were greatest from October to February.

  • Search early in the morning, within four hours of dawn, or during the evening on warm nights.
  • Prefer warm conditions that are not overly dry, with maximum temperatures hotter than 25 degrees Celsius where practicable.
  • Avoid relying on recently disturbed rock-search areas, because captures may be reduced for up to three months after rock turning.
  • Record the number of rocks or refuges searched, search time, area covered, weather and all habitat features inspected.

Survey methodology: 3. Pitfall trapping

Use pitfall trapping with drift fencing as a supplementary method to active searching, particularly where the species may move through grass or non-rocky habitat.

Use a trap line with six 4 to 10 litre buckets and funnel traps spread along a 15 metre drift fence.

Install traps in suitable vegetated habitat rather than bare ground, and avoid placing them where rocky ground prevents safe installation.

Check traps daily and provide appropriate shelter and protection from exposure, predation and by-catch in accordance with the project fauna management plan and permit conditions.

Published capture rate: 0.306 animals per 100 trap nights in the Porter study.

Recorded captures: Six individuals were captured during 12 months of trapping, all between October and February.

  • Schedule pitfall trapping from late spring through summer, with the strongest detection period from October to February.
  • Use the available capture rate only as an indication of low detectability, not as a measure of absence or abundance.
  • Inspect drift fences and traps after rain, storms or damage, and close or remove traps when the approved trapping period ends.

Survey methodology: 4. Camera monitoring and visual observation

Consider ground-facing camera traps where pitfall trapping is unsuitable, especially in rocky habitat or where repeated disturbance of refuges should be avoided.

Use cameras at ground level or in a vertical arrangement directed at a cork tile or other approved ground target, following the published terrestrial squamate camera protocol and project animal ethics requirements.

Run camera monitoring for about 3 to 4 weeks where this method is used, because longer deployment reduces the chance of missing a low-density population.

Use direct visual observation as an additional method in suitable habitat, particularly during warm morning or evening activity periods.

Published camera arrangement: The cited protocol used a camera about 70 centimetres above the ground, directed down at a cork floor tile, with daytime time-lapse images every 5 minutes.

  • Treat camera trapping as an additional method rather than a replacement for the guideline combination of hand searching and pitfall trapping unless an evidence-based alternative is documented.
  • Photograph any suspected Collared Delma and retain the location, date, observer and habitat information for verification.
  • Have difficult records checked by an experienced herpetologist or the relevant state wildlife authority, because small Delma species and burrowing skinks may be confused with Collared Delmas.

Survey methodology: Minimum effort and reporting

  • Allow at least three survey days for a new record search or monitoring of a known population in a typically small habitat patch.
  • If the species has not been detected, complete at least one replicate survey using all recommended techniques that are practicable for the site.
  • Use two to four people depending on the technique, with more people generally needed for active searching and fewer for camera installation.
  • Document dates, times, weather, temperatures, survey area, search time, refuges searched, trap configuration, trap nights, camera effort, results, by-catch and any departures from the guideline method.
  • Treat a claimed absence as requiring a documented, evidence-based evaluation of habitat, timing, effort and detectability.
  • Submit verified records, photographs and location data to the relevant Queensland or other state wildlife database and museum, subject to sensitive-record requirements.
  • Provide the survey report to the project decision-maker before clearing and retain it with approvals, permits and fauna records.

Before habitat disturbance: Avoid and minimise habitat loss

Plan the work around the species' habitat and its low detection rate. Collared Delma habitat can occur in small patches, road reserves, travelling stock routes and disturbed areas, so do not screen it out only because the vegetation is not intact.

Species status: Vulnerable under the EPBC Act and Vulnerable in Queensland.

Microhabitat: Rocks, logs, bark, coarse woody debris and leaf litter, commonly 30 to 100 millimetres deep, are important features.

  • Retain rocky ridges, slopes, exposed rocks, coarse woody debris, bark, termite-associated refuges and intact leaf litter wherever practicable.
  • Retain dry open eucalypt and eucalypt-acacia woodland, Brigalow and Belah vegetation, Poplar Box woodland and connected native tussock grass areas that may support the species.
  • Avoid removing or stockpiling surface rocks, logs and leaf litter from retained habitat.
  • Maintain movement links between habitat patches, including suitable vegetation along road reserves and travelling stock routes where these connect occupied or potentially occupied habitat.
  • Establish clearly marked no-go areas around retained habitat features before machinery enters the site. Use project-specific exclusion distances set by the qualified ecologist and approval conditions, because the supplied documents do not prescribe a universal buffer.

Before habitat disturbance: Approvals and fauna planning

  • Check whether the proposed action may significantly affect this EPBC Act listed species or its habitat, and make an EPBC referral or obtain other Commonwealth approval where required.
  • Check state or territory wildlife legislation, scientific or rehabilitation permits, animal ethics requirements and fauna spotter catcher licences before work starts.
  • Prepare a species-specific fauna management plan that sets out survey effort, exclusion zones, daily inspections, handling, temporary holding, relocation, injury response, stop-work triggers and reporting.
  • Ensure pre-disturbance surveys and fauna management are supervised by a suitably qualified person and follow the survey guideline in effect at the time or a documented equivalent method.
  • Confirm who may handle reptiles, who may approve relocation and which wildlife carer or veterinarian will receive injured animals.

Before habitat disturbance: Timing and staged preparation

  • Schedule the main search and, where practicable, ground disturbance for warm conditions that are not overly dry, with particular survey attention from October to February.
  • Use staged clearing so each work area is surveyed, marked and released separately rather than opening the entire disturbance area at once.
  • Complete the pre-clearance search after final disturbance boundaries and access routes are marked, and before rocks, logs, litter or vegetation are moved.
  • Mark retained rocks, logs, litter mats, termite features, habitat patches and connectivity routes on the construction plans and in the field.
  • Install exclusion fencing where it can direct animals away from machinery without trapping them or damaging retained refuges.

During habitat disturbance: Daily controls and machinery interface

Use a qualified fauna spotter catcher to control the interface between machinery and ground habitat. The low capture rate means that careful habitat handling and stop-work procedures are needed even when pre-clearance surveys find no animals.

  • Inspect the active work area, exclusion fencing and retained habitat at the start of each shift and after significant weather or fencing damage.
  • Keep machinery within approved disturbance limits and prevent unnecessary driving, parking, turning or material storage on retained rocks, logs, leaf litter and tussock habitat.
  • Use a fauna spotter catcher who can see the work face and communicate directly with the machine operator before each movement into ground habitat.
  • Clear progressively in small sections, allowing the spotter catcher to inspect each section and direct machinery away from animals, refuges and escape routes.
  • Stop machinery immediately when the spotter catcher calls stop, loses visibility of the work face, finds an animal or identifies an unapproved habitat feature.

During habitat disturbance: Handling and relocation

  • Do not allow untrained workers to chase, capture, injure or retain a Collared Delma.
  • Have the authorised fauna spotter catcher assess and handle the animal under the relevant permit and fauna management plan.
  • Use the least disruptive capture and containment method that is safe for the animal, and minimise handling time, heat exposure and repeated examination.
  • Relocate an animal only to nearby suitable retained habitat, with approval from the authorised ecologist and in accordance with permit conditions; record the release point and habitat features.
  • Do not move rocks, logs or leaf litter over an animal or use machinery to force it from a refuge.
  • Place injured animals in an appropriate temporary container and arrange prompt assessment by the nominated reptile veterinarian or wildlife carer.
  • Do not release an injured animal until the authorised rehabilitator or veterinarian confirms that release is appropriate.

During habitat disturbance: Habitat feature controls and stop-work triggers

  • Treat rocks, logs, bark, coarse woody debris, leaf litter mats, termite holes and tussock bases as potential refuges during ground disturbance.
  • Inspect and, where approved, move each habitat feature by hand or with suitable low-impact equipment under the direction of the spotter catcher.
  • Replace retained rocks, logs and other refuges in their original position where they are disturbed unintentionally.
  • Stop work and notify the project ecologist if a Collared Delma is found, if an unrecorded occupied habitat patch is identified, if exclusion fencing fails, or if clearing would extend beyond the approved footprint.
  • Stop work if conditions become too hot, dry or unsafe for effective fauna detection or handling, unless the fauna management plan provides an approved alternative.
  • Escalate any repeated captures, mortality, injury, unexpected concentration of animals or damage to retained habitat to the environmental manager and relevant regulator where required.

During habitat disturbance: Records and incident reporting

  • Record every animal observation, capture, relocation, injury, death, by-catch event and release location with date, time, GPS location, habitat, weather and photographs where possible.
  • Record the disturbance area inspected, personnel, machinery activity, habitat features handled and any stop-work event.
  • Report a confirmed Collared Delma record promptly to the project ecologist and the relevant state wildlife database, subject to sensitive-location controls.
  • Investigate and report any non-compliance, mortality or habitat damage under the approval conditions and fauna management plan.

After habitat disturbance: Post-clearance checks

Keep fauna controls in place after machinery leaves. The species may use small retained patches and refuges, so post-clearance checks should test both animal outcomes and the condition of remaining habitat.

  • Inspect the completed disturbance edge and retained habitat for trapped, injured or displaced reptiles before removing exclusion fencing or releasing the work area.
  • Recheck disturbed edges, rock piles, logs, leaf litter and tussock bases where the fauna management plan identifies a risk of animals remaining in the work zone.
  • Confirm that retained rocks, logs, bark, leaf litter and access routes have not been buried, removed, compacted or covered by spoil.
  • Remove temporary traps, fencing and equipment only after the authorised ecologist confirms that no fauna remains at risk and that the area is safe.

After habitat disturbance: Monitoring and adaptive management

  • Monitor retained habitat and any relocated animals using repeat active searches, pitfall trapping where approved, and camera monitoring where it is suitable and permitted.
  • Use at least three survey days for a monitoring event in a typically small habitat patch, and use the same methods and effort between monitoring events where comparisons are intended.
  • Schedule monitoring during warm, not overly dry conditions and include the October to February period where project timing allows.
  • Compare records of animals, occupied refuges, leaf litter, rocks, logs, weeds, grazing and fire impacts against the pre-disturbance baseline.
  • Adjust weed, grazing, fire, access and restoration controls if habitat features decline or detection results indicate continuing use by the species.

After habitat disturbance: Close-out, reporting and offsets

  • Prepare a close-out report covering cleared area, retained habitat, survey effort, fauna incidents, relocations, mortality, rehabilitation actions, monitoring results and any approval departures.
  • Submit required records and reports to the Commonwealth and state regulators within the timeframes in the approval or permit.
  • Maintain exclusion zones, access controls and habitat protection measures for as long as required by the fauna management plan and approval conditions.
  • Where residual significant impacts cannot be avoided or mitigated, apply the approved offset or other compensatory measure and document its relationship to Collared Delma habitat and connectivity.
  • Do not treat an absence of animals after clearing as proof that the area was unoccupied.

Rehabilitation actions: Rebuild habitat structure

Rehabilitation should recreate the dry woodland ground structure used by Collared Delmas, not just replace canopy cover. Retain and rebuild the small-scale refuges and connected habitat that support shelter, movement and prey.

Relevant vegetation associations: Dry open eucalypt woodland, eucalypt-acacia woodland, Brigalow and Belah forest, and Poplar Box woodland are documented habitat types.

Important ground features: Rocks, logs, bark, coarse woody debris, termite-associated refuges, tussock grass and leaf litter.

  • Use local native eucalypt and acacia woodland species suited to the original regional ecosystem and site soils.
  • Re-establish an open understorey with native tussock grasses and shrubs, including locally appropriate grass communities comparable to kangaroo grass and barbed-wire grass where these formed the pre-disturbance ground layer.
  • Spread retained or salvaged leaf litter over suitable areas to rebuild a ground layer commonly about 30 to 100 millimetres deep.
  • Reinstate weathered rocks in contact with soil, coarse woody debris, bark and logs in clusters and across connected habitat patches.
  • Retain or recreate small refuge areas rather than placing all rocks and logs in one pile.
  • Do not rely on nest boxes as a primary Collared Delma measure, because the species is a ground-dwelling legless lizard that uses surface refuges, litter and soil features.

Rehabilitation actions: Control weeds, grazing, fire and predators

  • Control dwarf lantana and other weeds that cover rocks, suppress native groundcover or prevent access to refuges.
  • Exclude stock from rehabilitation areas until leaf litter, tussock cover and refuge features are established and grazing no longer threatens habitat condition.
  • Use a fire regime that protects leaf litter and ground refuges, and avoid burning known or restored habitat unless an approved ecological fire plan demonstrates that it is appropriate.
  • Manage feral cats and foxes in accordance with the approved pest management programme, because both are identified threats to the species.
  • Manage fire ants and avoid chemical controls that could remove important invertebrate prey or expose reptiles to chemical risk.
  • Prevent erosion, compaction, spoil placement and altered drainage from damaging restored soil and refuge features.

Rehabilitation actions: Monitoring and success measures

  • Inspect rehabilitation areas for survival of planted eucalypts, acacias, native tussock grasses and shrubs, and for recovery of leaf litter and refuge features.
  • Track the number and condition of reinstated rocks, logs, bark pieces, litter mats and connected habitat patches.
  • Monitor weed cover, grazing signs, fire impacts, feral predator activity and fire ant presence.
  • Use repeat active searches during warm conditions, with pitfall traps or ground-facing cameras where approved, to test whether Collared Delmas use restored habitat.
  • Use the same search area, methods, timing and effort for successive monitoring events so results can be compared.
  • Set project-specific completion criteria in the rehabilitation plan, including survival of plantings, stable ground cover, maintained refuge features, weed and pest thresholds, and confirmed use by Collared Delma where detection is feasible.
  • Submit monitoring results, verified records and any failures of rehabilitation to the environmental manager and relevant regulators, and continue corrective actions until approval criteria are met.

Sources