Fauna Spotters logo

McIlwraith Leaf-tailed Gecko (Orraya occultus)

The McIlwraith leaf-tailed gecko is a medium to large, highly localised rainforest gecko found in rocky creek habitats of the McIlwraith Range on Cape York Peninsula. Its deeply piled granite boulder habitat can be overlooked during site works, and the species is difficult to detect at very low density. It is listed as Critically Endangered under Australian Government and Queensland legislation, so potential habitat should be treated as a high conservation priority and works should be planned with a suitably experienced herpetologist.

Conservation status

Commonwealth, EPBC Act 1999: Critically endangered.

Queensland, Nature Conservation Act 1992: Critically endangered.

Breeding season

The McIlwraith leaf-tailed gecko is poorly known, but females with enlarged ovarian follicles have been recorded in late May and early June. Breeding timing may vary between years and locations, and there is no confirmed seasonal window for laying or hatching.

Breeding mode: Egg-laying gecko. The species presumably lays eggs, as do other leaf-tailed geckos.

Clutch size: Probably two eggs per clutch.

Incubation: Not recorded.

Fledging or weaning: Not applicable. Hatchling and juvenile development timing is not recorded.

Age at maturity: About two years, based on expert assessment.

Breeding sites: Not recorded separately. Adults occur in moist, deeply piled granite-boulder habitat along upland rainforest creek sections.

Breeding frequency: Probably one or two clutches per year.

Breeding observations may shift between years and sites, and the newly recorded disjunct site shows that the species may occur in additional McIlwraith Range boulder habitat.

  • Females with enlarged ovarian follicles: Females with enlarged follicles were recorded in late May and early June, but this does not confirm the timing of laying.
  • Egg laying and hatching: The months for laying, incubation and hatching have not been established, so works should not rely on a seasonal clearance window.
  • Nocturnal activity in boulder habitat: Adults have been detected at night on deeply piled granite boulders, so night surveys are appropriate in suitable creek habitat throughout the year.
  • Presence in known habitat: The species is non-migratory in the available records and is associated with a highly localised area of upland rainforest and boulder creek habitat.
  • Highest clearing risk: For this critically endangered species, avoid clearing or damaging suitable boulder creek habitat in every month because breeding sites and young are not sufficiently understood.

Identification: Appearance and size

The McIlwraith leaf-tailed gecko is a medium to large gecko with a long neck and a flattened, rounded tail. It is distinctive to an experienced herpetologist, but field teams should obtain expert confirmation because the species is rare and the known population is very small.

Adults have a grey background colour with irregular dark mottling. The body is covered in small conical tubercles and the neck is distinctly elongated.

The snout to vent length is about 10 to 11 cm. Total length is about 15 cm.

Body texture: Moderately prickly, with small tubercles.

Colour: Grey with darker blotches or irregular mottling.

  • Long neck caused by comparatively long cervical vertebrae.
  • Rounded, flattened tail with a teardrop shape in the original tail.
  • A regenerated tail may be round or teardrop shaped, with a serrated edge.
  • The underside is smooth and cream coloured with brown mottling.

Identification: Similar species

The McIlwraith ring tailed gecko, Cyrtodactylus pronarus, occurs in the same general habitat and is relatively large and abundant. It does not have the same long neck and leaf tailed appearance.

Other leaf tailed geckos in the genera Phyllurus and Saltuarius differ in neck and tail form. The McIlwraith leaf tailed gecko is geographically isolated from these species.

  • Check any large gecko seen on or beside granite boulders at night.
  • Use photographs and a suitably experienced herpetologist for confirmation where identification is uncertain.

Identification: Calls and field signs

No diagnostic call or echolocation behaviour is known for this species. It is generally located by night spotlighting and eye shine on boulders.

There are no established diagnostic droppings, nests, stains, odours or other indirect field signs for use on clearing sites. A direct sighting, clear photograph or expert verified record is the most useful evidence.

  • Do not rely on the absence of calls or droppings to clear an area.
  • Record the exact habitat, boulder position, height, time, weather and photographs for every observation.
  • Keep exact locations confidential because collecting and poaching are potential concerns for such a localised species.

Distribution: Australian range

The species is known from the McIlwraith Range on Cape York Peninsula in Queensland. Its distribution is extremely restricted and surveys have covered only a small part of the uplands, so apparently suitable habitat elsewhere in the range should not be dismissed without assessment.

The confirmed known range is in the uplands of the McIlwraith Range, above about 400 m elevation, in Far North Queensland. The original known population occurred along about 900 m of Peach Creek.

A 2024 survey found a second, disjunct site in the central eastern McIlwraith Range, about 12 km in a straight line from the Peach Creek site.

Known occupied habitat estimate: About 0.32 km² based on a 400 m grid.

Area of occupancy estimate: 4 km² using a 2 km by 2 km grid.

  • Queensland, McIlwraith Range and Cape York Peninsula.
  • Species mapping also includes New South Wales and Queensland, but the confirmed localities described here are in Queensland.
  • All known sites are within Kulla, McIlwraith Range National Park and Cape York Peninsula Aboriginal Land.

Distribution: Survey implications

The uplands are difficult to access and contain extensive areas that have not been surveyed. Deep boulder fields visible from the air and other rocky creeklines are reasonable targets for further assessment.

Low numbers in a survey do not demonstrate that a site is unoccupied. Two individuals were found after many hours over three nights at the 2024 site.

  • Treat mapped or potential boulder habitat as a possible occurrence area until a competent survey has been completed.
  • Plan access carefully. Helicopter access and collaboration with Traditional Custodians may be needed in remote terrain.
  • Do not publish or circulate precise localities beyond the project team and relevant authorities.

Distribution: Overseas range

The species is endemic to Australia. No overseas distribution is recognised.

Habitat: Habitat features

Look for this gecko in upland rainforest where creeklines have cut into underlying rock and formed narrow sections several boulders deep. The combination of moist rainforest, deeply piled granite and sheltered crevices is more useful for site assessment than vegetation type alone.

Known habitat consists of short creek sections with deeply piled granite boulders. These rocky sections are usually narrow and are separated by longer stretches of creek or rainforest with little suitable boulder cover.

The species appears almost certainly restricted to this specialised habitat. It has not been found during night surveys in surrounding rainforest or in long stream sections without deep boulders.

  • Upland and mid altitude rainforest.
  • Deeply piled granite boulder fields and boulder slopes.
  • Rocky creeklines where erosion has exposed or concentrated boulders.
  • Moist crevices and shaded spaces between or beneath boulders.
  • Areas above about 400 m in the McIlwraith Range.

Habitat: Features to check on a work site

During a pre clearance inspection, walk creeklines and inspect the boulder structure rather than relying only on broad vegetation mapping. Give particular attention to short rocky sections that retain shade and moisture.

Potential habitat may occur beneath an intact rainforest canopy and may be difficult to see from ground level. Avoid moving boulders or entering crevices during an initial inspection.

  • Boulders piled several layers deep.
  • Stable shaded faces, overhangs and narrow gaps.
  • Moist substrates and sheltered creek margins.
  • Unmodified boulder slopes connected to rainforest.
  • Rocky sections that could be affected by access tracks, drainage, blasting or sediment movement.

Habitat: Habitat condition

There is little information on the species response to disturbance. Retain the full boulder formation and its rainforest, shade and moisture conditions wherever possible.

A site should not be considered low risk simply because no gecko is seen. The species appears to occur at very low density and may be difficult to detect in deep boulder habitat.

  • Avoid clearing or rolling boulders from creeklines.
  • Prevent changes to drainage, runoff and sediment loads around occupied or potential habitat.
  • Keep machinery, laydown areas and access routes out of boulder fields and narrow rocky creek sections.
  • Use a project specific ecological assessment where works may affect this habitat.

Foraging habitat: Likely foraging areas

The diet is poorly known, but at least one individual had spider fragments in its gut. Foraging is expected to occur around moist rainforest and boulder habitat, where invertebrate prey and sheltered movement routes are available.

Search effort should include the boulder surfaces, crevices, shaded rainforest edge and immediate creek margin around suitable rocky sections. The species has been detected at night on deeply piled granite boulders.

Do not assume that bare rock is unused habitat. Crevices and the spaces between boulders may provide both prey and cover.

  • Deep boulder piles and shaded rock faces.
  • Moist gaps between boulders.
  • Rainforest immediately adjoining rocky creek sections.
  • Stable creek margins with leaf litter and invertebrate activity.

Foraging habitat: Diet and competition

Only limited dietary information is available. Spider remains have been recorded from one individual, and other invertebrate prey may also be taken.

The abundant McIlwraith ring tailed gecko may use similar habitat and prey. Competition for invertebrates is possible, but its significance has not been established.

  • Retain leaf litter, moisture and natural prey habitat.
  • Avoid unnecessary night lighting around boulder habitat.
  • Do not use pesticides near potential habitat unless they are specifically assessed and approved for the project.

Foraging habitat: Site practice

Night lighting, dust, vibration and changes to moisture can alter activity around boulders even when the boulders themselves are retained. Keep these effects away from potential habitat where practicable.

  • Shield temporary lighting away from rainforest and boulder fields.
  • Control dust and sediment entering rocky creeklines.
  • Use fauna spotter catchers experienced with nocturnal rainforest reptiles during any approved disturbance.

Breeding habitat: Known reproductive information

Breeding habitat has not been described separately from the species' upland rainforest and deeply piled granite boulder habitat. Because the population is small and the species may mature slowly, all suitable boulder habitat should be treated as potential breeding habitat.

Two females collected in late May and early June had enlarged ovarian follicles. The species is presumed to lay two eggs per clutch, as occurs in other leaf tailed geckos, and may produce one or two clutches each year.

Expert assessment suggests maturity at about two years. Estimated generation length is about 8.5 to 9.5 years.

  • No confirmed nest structure or egg laying site has been described.
  • No incubation period, hatching period or juvenile development information is available.
  • No breeding aggregation or maternity site is known.

Breeding habitat: Potential breeding places

Egg laying sites may occur in protected parts of the same boulder and rainforest system used by adults, but this has not been confirmed. Avoid disturbing deep crevices, stable boulder piles, moist cavities and accumulations of organic material.

Do not search for eggs by dismantling boulders or opening shelters. Such actions could damage habitat and harm adults or young.

  • Deep, stable boulder piles beside or within rocky creeklines.
  • Sheltered crevices with stable temperature and moisture.
  • Shaded rainforest floor and rock interfaces near occupied habitat.
  • Undisturbed areas connected to known or potential habitat.

Breeding habitat: Clearing and construction controls

For Critically Endangered habitat, the preferred approach is avoidance. If works may affect a rocky creekline or boulder field, obtain project specific ecological and regulatory advice before design is finalised.

A fauna spotter catcher should not relocate boulders or search inaccessible crevices without an agreed method. Stop work and seek advice if a gecko, egg or suspected breeding place is found.

  • Set out no go areas around boulder habitat before machinery arrives.
  • Keep drainage, vibration, blasting and access works away from rocky creek sections.
  • Use pre clearance checks and staged clearing where disturbance cannot be avoided.
  • Record and report any sighting promptly to the project ecologist and relevant authority.

Sheltering habitat: Shelter features

Individuals have been found at night using eye shine on deeply piled granite boulders. The species appears dependent on moist microhabitats, but its precise daytime shelters and roost structures are not known.

Inspect deep boulder piles, shaded rock faces, overhangs and narrow crevices along short rocky creek sections. These features may provide shelter during the day and foraging surfaces at night.

The species has not been associated with hollows, caves, burrows or communal roosts. Do not assume that a lack of an obvious shelter means the habitat is unused.

  • Moist gaps between granite boulders.
  • Deep, stable boulder stacks.
  • Shaded overhangs and rock faces.
  • Rainforest covered or partially covered rock at creek margins.

Sheltering habitat: Night detection

Spotlighting is the main field method described for locating individuals. Search boulder habitat at night and use eye shine, while taking care not to climb on, move or destabilise boulders.

Detection can be poor. One survey recorded two individuals in about 10 person hours of spotlighting, and no survey of the original site recorded more than four geckos.

  • Use experienced nocturnal reptile observers.
  • Move slowly and scan all accessible boulder faces and gaps.
  • Record survey hours, observers, weather and the area searched.
  • Avoid prolonged handling and release any captured animal at its exact point of capture unless an approved protocol states otherwise.

Sheltering habitat: Protection during works

Retain boulder piles and the surrounding rainforest canopy. Prevent changes that dry the habitat, block natural drainage or destabilise the rock formation.

If a gecko is found during works, stop activity in the immediate area, protect the animal from machinery and obtain direction from the project ecologist before proceeding.

  • Do not roll, split, excavate or stockpile boulders from potential habitat.
  • Keep spoil, sediment and construction materials out of creeklines.
  • Maintain shaded, moist conditions around retained habitat.
  • Use a clearly marked exclusion area during construction.

Threats: Habitat disturbance and loss

The McIlwraith leaf-tailed gecko has an extremely small known distribution and appears to occur at very low density. Development and land management decisions should therefore focus on avoiding loss or drying of boulder habitat, preventing unapproved collection and improving detection before disturbance.

Clearing rainforest, removing boulders, constructing access tracks and altering rocky creeklines could remove or fragment the specialised habitat used by the species.

Works near suitable habitat can also cause indirect damage through spoil placement, sediment, erosion and changes to drainage.

  • Avoid boulder fields, rocky creek sections and adjoining rainforest.
  • Do not use potential habitat for tracks, compounds, stockpiles or spoil.
  • Keep natural drainage and boulder stability intact.
  • Obtain threatened species advice before any unavoidable disturbance.

Threats: Moisture, fire and climate stress

The species appears dependent on moist microhabitats. Activities that increase exposure, reduce canopy shade or change water movement may reduce habitat quality.

Fire and pest management are relevant to protection of the McIlwraith Range ecosystem, although species specific impacts have not been established. Apply fire and land management actions cautiously around known or potential boulder habitat.

  • Retain rainforest canopy over and beside boulder habitat.
  • Prevent concentrated runoff, drainage interception and sediment entry.
  • Avoid unnecessary burning near rocky creeklines and moist refuges.
  • Monitor retained habitat after major fire, drought or construction events.

Threats: Collection and handling

The species is highly localised and exact localities are confidential. Unauthorised collection, handling or disclosure of locations could add pressure to the small population.

Only authorised personnel should handle an animal, and handling should be limited to what is needed for identification, protection or an approved survey.

  • Keep location data restricted to the project team, land managers and relevant authorities.
  • Do not advertise sightings or publish precise coordinates.
  • Use secure records and verified photographs wherever possible.

Threats: Low detectability and project risk

Very few individuals have been recorded despite repeated surveys. A negative night survey is not enough to demonstrate that suitable deep boulder habitat is unoccupied.

For a Critically Endangered species, use a precautionary approach. Design works to avoid potential habitat first, then use targeted survey and specialist advice where avoidance is not possible.

  • Engage a qualified herpetologist early in project planning.
  • Survey potential habitat before finalising clearing limits or access routes.
  • Use staged clearing and an agreed stop work procedure.
  • Report any observation immediately and review the work method before continuing.

Survey methodology: 1. Desktop assessment

The McIlwraith leaf-tailed gecko is extremely localised and difficult to detect. Surveys should focus on deeply piled granite boulders along upland rainforest creek sections, rather than broad areas of rainforest or stream without boulders.

Map deeply piled boulder habitat, creek erosion features, upland rainforest and access constraints before planning fieldwork.

Treat all suitable boulder creek habitat in the McIlwraith Range as potential habitat. The species is known from above 400 m elevation and from a 900 m section of Peach Creek, with a further site about 12 km away.

Handle exact known localities as confidential information because poaching is a threat.

  • Review recent aerial imagery and local knowledge for boulder fields, creekline access and potential landing sites.
  • Consult Traditional Custodians and Queensland Parks and Wildlife Service before entering Kulla, McIlwraith Range National Park.
  • Plan for difficult terrain, remote access, weather changes and limited evacuation options.

Survey methodology: 2. Night spotlighting

Search at night using careful spotlighting and eye shine detection on and between deeply piled granite boulders.

Search the faces, ledges, cracks and shaded gaps of boulder piles. Also check short creek sections where the channel has eroded into underlying rock.

Experienced herpetologists are unlikely to confuse this species with other leaf-tailed geckos, but record photographs and diagnostic features for every detection.

  • Survey during suitable warm and moist conditions when geckos are active. Avoid unsafe conditions during heavy rain, flood conditions or severe weather.
  • Use repeated night surveys where access and conditions allow. Historical surveys found very few animals, so one unsuccessful night does not exclude presence.
  • Include adjacent boulder slopes and nearby creek sections that can be reached safely. Do not restrict the search to the previously known locality.

Survey methodology: 3. Effort and detection limits

There is no validated minimum survey effort for this species. The species can occur at very low density, or may be difficult to detect in deep boulder habitat.

A recent survey searched a large area over three nights and found two animals within 10 m of one another. Use this as a guide to the level of effort that may be needed, not as a standard detection threshold.

  • Record each survey date, start and finish time, surveyors, weather, temperature if measured, recent rainfall, moon or light conditions, access route and habitat searched.
  • Record person-hours, search area, creek length, boulder habitat searched and the number of nights completed.
  • Document areas that could not be searched and explain why.

Survey methodology: 4. Records and specimen handling

For each animal, record the location, elevation, habitat, position on the boulders, behaviour, photographs and identification features.

Record non-detections as well as detections. Include observations of the McIlwraith ring-tailed gecko and other reptiles, as these help describe survey conditions and potential prey competition.

  • Use secure coordinates and restrict circulation of exact locations.
  • Do not collect, mark, move or retain an animal unless authorised under the relevant permit and approved survey plan.
  • Report a suspected new population promptly to the relevant Queensland environment authority and the land manager.

Before habitat disturbance: 1. Approvals and permits

This is a critically endangered species with a very small known distribution. Avoidance is the first response, and any work near potential boulder creek habitat should be planned on the assumption that an animal may be present.

Obtain environmental advice before finalising the work footprint, access tracks, laydown areas or landing sites.

Assess whether the action requires an EPBC Act referral or approval. Confirm the current Commonwealth listing and referral requirements with the Australian Government environment department.

Confirm Queensland requirements, including any species management program, protected wildlife authority and permits for fauna survey, handling, salvage or relocation.

  • Obtain written approval from the land manager before entering Kulla, McIlwraith Range National Park.
  • Do not rely on a general clearing approval where a threatened animal, breeding place or habitat may be affected.
  • Keep permit conditions and the approved fauna management plan on site.

Before habitat disturbance: 2. Avoidance and buffers

Redesign the work to retain deeply piled granite boulders, narrow boulder creek sections, surrounding rainforest and moist microhabitat.

Avoid clearing, blasting, vibration, drainage changes, sediment release, vehicle access and spoil placement in or near suitable boulder habitat.

Use a site-specific buffer based on expert ecological advice, habitat mapping and approval conditions. A generic distance is not supported for this species.

  • Fence and sign retained habitat before machinery arrives.
  • Keep exclusion fencing outside the boulder field and creekline, with enough room to prevent collapse, trampling and indirect drainage impacts.
  • Prevent access to known localities by unauthorised people.

Before habitat disturbance: 3. Pre-clearance survey and timing

Complete a targeted nocturnal survey immediately before disturbance, with effort scaled to the size and quality of boulder habitat and the species' critically endangered listing.

There is no confirmed migration period. Avoid scheduling work when heavy rain, flooding or other conditions would prevent safe detection and would damage moist boulder habitat.

Breeding details are poorly known. Females with enlarged ovarian follicles have been recorded in late May and early June, and the species is thought to lay one or two clutches a year. Treat all suitable habitat as potential breeding habitat year round.

  • Survey every accessible boulder creek section within the disturbance footprint and the access corridor.
  • Have the fauna ecologist inspect cracks, ledges and sheltered boulder surfaces without dismantling habitat.
  • Stop and reassess if the survey cannot be completed because of access, weather or visibility.

Before habitat disturbance: 4. Induction and exclusion

Induct all workers in species recognition, habitat features, exclusion zones and stop-work procedures.

Show workers photographs of the gecko and the McIlwraith ring-tailed gecko, and explain that the leaf-tailed gecko has a long neck and a rounded, flattened, often teardrop-shaped tail.

Appoint an appropriately experienced fauna spotter catcher with authority to stop work immediately.

  • Mark retained boulders, creeklines and access limits on plans and in the field.
  • Prohibit handling by untrained workers, contractors or visitors.
  • Brief crews on the confidential nature of location information.

During habitat disturbance: 1. Sequential clearing

Work slowly and in a controlled sequence. A fauna spotter catcher must be able to stop machinery, inspect habitat and protect any animal or breeding place before disturbance continues.

Clear from the least sensitive edge towards the retained habitat, using the smallest practical work area and low ground pressure where feasible.

Remove loose surface vegetation carefully before any disturbance to boulders. Do not roll, split, lift or relocate boulders unless the action has been specifically assessed and authorised.

Keep machinery, spoil, fuels, sediment and lighting away from retained creekline boulder habitat.

  • Establish the exclusion zone before clearing starts.
  • Clear in short stages, with the spotter catcher checking each stage before the next begins.
  • Stop work during heavy rain, flooding, unsafe footing or loss of visibility.

During habitat disturbance: 2. Animal or breeding place found

Stop work immediately if a McIlwraith leaf-tailed gecko, suspected breeding place, eggs, shelter site or other protected fauna feature is found.

Keep people and machinery clear. Do not chase, uncover, capture or move the animal unless the authorised fauna professional directs it under the relevant permit.

Seek advice from the project ecologist, Queensland environment authority and land manager before deciding whether work can resume.

  • Protect the exact location and extend the exclusion zone if the animal is within or near the work area.
  • Do not dismantle boulder habitat to search for additional animals.
  • Treat eggs or a suspected breeding place as active until a qualified person confirms otherwise.

During habitat disturbance: 3. Handling and relocation

Only an authorised and experienced reptile handler may handle the animal. Avoid handling wherever the animal can remain safely in place.

If relocation is permitted, use a ventilated, secure container, keep the animal cool and shaded, minimise holding time and place it into suitable nearby boulder habitat approved by the ecologist and land manager.

Do not relocate the species to an unverified site or release it outside its known range.

  • Record the original location, time, habitat, condition and destination before release.
  • Do not use adhesive traps, glue boards, chemicals or exclusion methods that could injure reptiles.
  • Do not disturb a shelter site more than necessary to achieve a safe rescue.

During habitat disturbance: 4. Injured or dead animal pathway

Keep an injured animal quiet, shaded and secure. Do not offer food or water unless directed by a wildlife veterinarian or authorised wildlife carer.

Contact the project ecologist, the relevant Queensland wildlife authority and a suitable wildlife veterinarian as soon as possible.

Treat a dead animal as a significant record and preserve it only under direction from an authorised authority or museum.

  • Photograph the animal and work area without delaying care.
  • Record the likely cause, location, time, machinery involved and people present.
  • Suspend the relevant activity until the incident has been assessed.

During habitat disturbance: 5. Daily records

Maintain a daily fauna log for all searches, detections, handling events, injuries, deaths, stop-work events and habitat damage.

Record negative results with the same care as positive results because detection is naturally low for this species.

  • Include date, time, weather, survey effort, habitat searched, personnel, equipment, coordinates and photographs.
  • Record permit numbers, approvals, instructions received and the name of the decision maker for each incident.
  • Provide records to the project ecologist and relevant authorities in the required reporting format.

After habitat disturbance: 1. Post-clearance inspection

Completion of clearing does not end the risk. Check the work area, confirm that retained habitat remains intact and use the results to improve future controls.

The fauna ecologist and spotter catcher should inspect the cleared edge, retained boulder habitat, creekline and access route after each clearing stage.

Look for injured animals, displaced boulders, collapsed shelter, sediment, altered drainage, fire damage and unauthorised entry into exclusion zones.

  • Complete a final inspection before removing fauna controls or releasing the work area to construction crews.
  • Reinstate fencing and exclusion signs where retained habitat remains at risk.
  • Record all findings with photographs and mapped locations.

After habitat disturbance: 2. Reporting and compliance

Report detections, incidents, injuries, deaths, breeding places, permit breaches and unexpected habitat impacts to the project manager, ecologist, land manager and relevant authorities.

Submit statutory reports within the timeframes set by the EPBC approval, Queensland approval, species management program or wildlife permit.

  • Keep a complete chain of records from pre-clearance survey through to final inspection.
  • Update the habitat map and confidential species register after every confirmed detection.
  • Escalate any new site record because the known population is small and highly localised.

After habitat disturbance: 3. Relocated animals

Where relocation has been authorised, check the release area for suitable moist boulder habitat and avoid further disturbance there.

Use post-release checks only where they can be completed without repeated handling or damage to the habitat. Detection may be difficult and a failure to find the animal does not prove mortality.

  • Record release location, habitat condition, weather, time, container duration and animal condition.
  • Report any later recapture, injury or mortality through the project fauna records.
  • Do not move the animal again without fresh authority and ecological advice.

After habitat disturbance: 4. Monitoring and incident review

Review the effectiveness of the survey, exclusion zones, clearing sequence, lighting and sediment controls after the work.

For major projects affecting potential habitat, develop a monitoring program with the relevant authority and land manager. Monitoring may include repeat nocturnal searches of retained boulder creek habitat.

  • Compare effort and detection conditions between surveys.
  • Investigate any injury, mortality, habitat damage or unauthorised access before the next work stage.
  • Amend the construction environmental management plan where controls were ineffective.

Rehabilitation actions: 1. Restore habitat structure

Rehabilitation should restore the rocky, moist creekline habitat on which this gecko appears to depend. The species is poorly known, so habitat protection and natural recovery are safer than experimental structures or releases.

Retain and stabilise existing granite boulders wherever possible. Do not create artificial boulder piles without advice from a qualified herpetologist and approval from the land manager.

Restore natural creek form, drainage and moist refuges. Prevent sediment smothering, erosion, compaction and drying of retained boulder habitat.

Use locally appropriate native rainforest species to restore canopy, shade and ground cover.

  • Remove temporary fill, access material, fencing and waste from rehabilitation areas.
  • Repair drainage so clean water can reach the creek without concentrating flows through boulder habitat.
  • Use erosion controls that do not block animal movement or cover cracks and refuges.

Rehabilitation actions: 2. Breeding and refuge structures

No artificial nest, roost or breeding structure has been validated for the McIlwraith leaf-tailed gecko. Do not install nest boxes, bat boxes, artificial nests or roost structures as a substitute for retaining natural boulder habitat.

If a project proposes artificial refuges, obtain advice from a threatened reptile specialist and the relevant authority first. Test any design through an approved research or monitoring program.

  • Do not place boxes or structures in known habitat without approval.
  • Do not use structures designed for birds or bats as presumed substitutes for gecko refuges.
  • Prioritise natural boulder piles, shaded cracks, moist microhabitats and intact creeklines.

Rehabilitation actions: 3. Weeds, fire and water

Control weeds using methods that protect boulders, creek water, native vegetation and reptiles. Avoid chemicals, smoke or machinery entering retained habitat unless specifically approved.

Manage fire in accordance with the park management framework and specialist ecological advice. Avoid actions that dry, scorch or destabilise boulder creek habitat.

Maintain clean, natural water flows and prevent polluted runoff, sediment and construction debris from entering the creek.

  • Inspect rehabilitation areas for weed regrowth after rain and during scheduled maintenance.
  • Use hand methods near boulder piles where machinery could collapse habitat.
  • Keep fuels, herbicides and wash-down water away from creeklines and boulder fields.

Rehabilitation actions: 4. Lighting and access

Limit artificial light near retained habitat because this is a nocturnal gecko. Use only the lighting needed for safety and direct it away from boulders, creeklines and rainforest.

Restrict vehicles, pedestrian traffic and future maintenance access around restored boulder habitat.

  • Use shields, low-spill fittings and temporary lighting controls where lighting cannot be avoided.
  • Remove temporary lights as soon as work is complete.
  • Maintain signs and barriers where public or contractor access could damage habitat or expose confidential localities.

Rehabilitation actions: 5. Long-term monitoring

Monitor rehabilitation for habitat condition, drainage, weed cover, boulder stability and any gecko detections. Set the duration and frequency with the relevant authority and project ecologist.

Use repeat nocturnal spotlighting under comparable conditions, while recognising that very low detection rates make conclusions uncertain.

  • Record survey effort, weather, habitat condition and all reptile observations at every visit.
  • Include Traditional Custodians and the land manager in monitoring design and fieldwork where appropriate.
  • Continue monitoring until habitat controls are stable and the approval conditions have been met.

Sources