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Blue-tailed Snake-eyed Skink (Cryptoblepharus egeriae)

The Blue-tailed Skink is a small, slender skink endemic to Christmas Island. It is now extinct in the wild, or close to it, and survives mainly in captive populations, so any suspected sighting during works needs immediate protection and specialist advice. The species is listed as Critically Endangered under the EPBC Act and is protected wildlife.

Conservation status

Commonwealth, EPBC Act 1999: Critically endangered.

Breeding season

The Blue-tailed Snake-eyed Skink is extinct in the wild on Christmas Island, with captive populations in Australia. Captive breeding occurs mainly from October to April, although breeding is likely possible throughout the year and timing may differ in any reintroduced or undiscovered wild populations.

Breeding mode: Oviparous. The species lays eggs.

Breeding season: October to April in captivity. Breeding is likely to occur throughout the year.

Clutch size: One to two eggs, generally two eggs.

Incubation: Approximately two months, or about 75 days.

Age at first breeding: Approximately one year.

Egg-laying sites: Moist areas under leaf litter or bark.

Breeding frequency: Multiple clutches may be laid during a breeding season.

Timing may vary between years and regions, particularly between captive breeding populations, any future reintroduced populations and any undiscovered wild animals on Christmas Island.

  • Breeding and egg laying: Captive breeding is recorded from October to April, while breeding in the wild is likely to occur throughout the year.
  • Egg incubation: Eggs may be present in any month because breeding is likely to occur throughout the year and incubation lasts about two months.
  • Hatchlings and juveniles: Young may be present in any month, although the timing and duration of juvenile dependence are not recorded.
  • Daytime activity and foraging: The species is diurnal and is most active between 10 am and 2 pm, foraging and basking on the ground, rocks, low vegetation and trees.
  • Highest clearing risk: Treat clearing and construction as a year-round risk because eggs may be under leaf litter or bark, breeding may occur throughout the year, and the species is critically endangered.

Identification: Appearance and size

The Blue-tailed Skink is a small, active lizard with a brown to brown-black body and a conspicuous light blue tail. It is bold when present and may occur singly or in small groups.

Adults are slender and about 4 to 5 cm from the snout to the vent. The tail is longer than the body and is usually the most obvious feature.

The species can shed its tail when attacked. A skink with a regrown tail may have less obvious blue colouring.

  • Brown or brown-black body.
  • Bright light-blue tail, sometimes conspicuous at a distance.
  • Small, agile lizard that may move quickly across rock, bark, walls or low vegetation.

Identification: Calls and similar species

No call or echolocation feature is used to identify this species. Identification should be based on the body shape, size, location and bright blue tail.

The Blue-tailed Skink is the only Cryptoblepharus species recorded on Christmas Island. Introduced skinks and geckos also occur on the island, so photographs and an experienced reptile assessor are useful where the tail is not visible.

  • Do not rely on colour alone if the animal has lost or regrown its tail.
  • Do not handle an animal solely to confirm its identity.

Identification: Field signs

There are no reliable, distinctive droppings, nests, stains, odours or calls described for field identification. Direct observation is the most useful field record.

The species was described as conspicuous and likely to be seen quickly when present, but rugged and difficult-to-access parts of Christmas Island may still conceal animals.

  • Record the exact location, habitat, time, weather and activity.
  • Take clear photographs from a distance where this can be done without pursuit.
  • Avoid chasing, trapping or moving the animal unless this is covered by an approved conservation or fauna management procedure.

Distribution: Australian range

The Blue-tailed Skink is endemic to Christmas Island, an Australian external territory in the Indian Ocean. It is not known as a naturally occurring mainland species, despite some broad Australian mapping categories that may show a state or territory association.

The species historically occurred across Christmas Island, including settlement areas, coastal areas, rainforest edges and old mined areas. Christmas Island covers about 135 km².

By 2008, surveys across 68 sites found animals only at Egeria Point and North West Point. The North West Point population disappeared by mid 2008, and the Egeria Point population disappeared by mid 2010.

  • Australian external territory: Christmas Island.
  • Last known wild population: Egeria Point, within Christmas Island National Park.
  • No currently known wild population.

Distribution: Captive and translocated populations

Remaining animals are held mainly in captive populations on Christmas Island and at Taronga Zoo. Assisted colonisation has also been undertaken on two islands in the Cocos Keeling Islands.

The Cocos Keeling Islands sites are outside the species' historical indigenous range. Animals at these sites should be treated as conservation populations, not as evidence of a natural mainland distribution.

  • Christmas Island captive population.
  • Taronga Zoo captive population.
  • Assisted colonisation sites in the Cocos Keeling Islands.

Distribution: Site planning and records

Any project on Christmas Island, or any project involving a conservation release site, should check current records with Parks Australia and the relevant threatened species authority before works begin.

A suspected sighting should be treated as a high priority record because the wild population may be zero.

  • Use precise coordinates and photographs where safe.
  • Record whether the animal was seen on rock, vegetation, a wall, a tree trunk, ground litter or another feature.
  • Keep the animal and its immediate habitat undisturbed until the fauna ecologist provides direction.

Habitat: Natural vegetation and landforms

The species was highly adaptable and used both natural and modified habitats on Christmas Island. On a work site, inspect warm, exposed surfaces near cover, especially where rock, bark, leaf litter and low vegetation occur together.

Historical habitat included tall primary rainforest, rainforest edges, canopy gaps, deciduous thickets and coastal thickets. The species was also recorded on limestone cliff walls and exposed coastal surfaces, including areas near the splash zone.

Rugged limestone pinnacles and difficult-to-access coastal terrain may provide refuge, although no particular refuge type has been confirmed.

  • Rainforest edges and clearings.
  • Coastal thickets and limestone cliffs.
  • Deciduous thickets and low coastal vegetation.
  • Exposed rocks, tree trunks and ground with nearby cover.

Habitat: Modified habitats

The species formerly used household gardens, brick walls, roadside vegetation, buildings and old mine sites. It was often more common in disturbed areas than in tall, closed rainforest.

Modified habitat should not be dismissed as low value. Retain native vegetation, rock features, wall surfaces, bark and ground cover until a fauna ecologist has assessed the site.

  • Old mined areas and unrehabilitated ground.
  • Roadside vegetation and clearings.
  • Walls, fences and buildings.
  • Household gardens and other settled areas.

Habitat: Pre-clearing checks

For a Critically Endangered species, survey planning should be conservative. Inspect all suitable surfaces and cover before clearing, demolition, earthworks or vegetation removal.

Search during the warmer part of the day, particularly from 10 am to 2 pm, when basking and foraging activity is greatest. Use a suitably experienced reptile ecologist for searches in rugged or inaccessible habitat.

  • Inspect exposed rock, cliff faces, tree trunks, low vegetation, leaf litter and bark.
  • Check walls, fences, buildings and old mine features before disturbance.
  • Stage clearing so habitat can be checked immediately before each work area is disturbed.

Foraging habitat: Foraging locations

The Blue-tailed Skink is a diurnal generalist predator of small invertebrates. It forages across several levels of the site, so surveys should not be limited to the ground.

Animals forage on the ground, exposed rocks, low vegetation, tree trunks and in the canopy. They may bask and forage on walls, fences and other built surfaces.

Open surfaces beside cover are useful places to look, particularly where insects are abundant and the animal can retreat quickly.

  • Bare rock and limestone surfaces.
  • Ground litter and low vegetation.
  • Tree trunks, branches and canopy gaps.
  • Walls, fences and roadside vegetation.

Foraging habitat: Food resources

Recorded or reported prey includes crickets, grasshoppers, termites, spiders and moths. Food availability is likely to vary with rainfall and habitat condition.

Yellow crazy ant supercolonies can reduce the abundance of other invertebrates and may alter ground litter and understorey conditions.

  • Retain native vegetation and ground cover where practicable.
  • Avoid unnecessary lighting, pesticide use and removal of insect-rich vegetation near suitable habitat.
  • Manage rubbish and food sources that may increase introduced predators or pest species.

Foraging habitat: Survey timing and work controls

Search during daylight, with emphasis on the period from 10 am to 2 pm. Record weather and surface conditions because activity may change with temperature, rain and shade.

If a skink is found, pause nearby works and allow the fauna ecologist to assess whether the animal can move away safely or whether an authorised capture and relocation procedure is required.

  • Keep machinery and personnel clear of the sighting location.
  • Do not seal gaps, remove cover or disturb rock until the area has been checked.
  • Use spotters who can recognise small blue-tailed skinks and other reptiles.

Breeding habitat: Breeding period and eggs

Breeding details are better known from captivity than from wild animals. Eggs are laid in moist, concealed places, so small patches of leaf litter, bark and cover may be significant during clearing.

Captive breeding occurs mainly from October to April. Breeding may occur throughout the year, so works should not assume that a winter or summer shutdown will avoid breeding impacts.

The species is oviparous. Clutches generally contain one to two eggs, and incubation takes about two months.

  • Breeding season recorded in captivity: October to April.
  • Clutch size: one to two eggs.
  • Incubation: about two months.

Breeding habitat: Breeding places

Eggs are generally laid in moist areas under leaf litter or bark. Other Cryptoblepharus species may nest communally, so more than one animal or clutch may use a small area.

Specific wild nest sites and breeding colonies are poorly documented. Treat moist cover and undisturbed refuges as potential breeding habitat.

  • Moist leaf litter.
  • Loose bark and fallen bark slabs.
  • Sheltered ground beside rocks, logs or dense low vegetation.
  • Small areas of retained cover within otherwise modified habitat.

Breeding habitat: Management during clearing

Before removing vegetation, bark, litter, rocks or other cover, have the area checked by a qualified fauna ecologist. Hand searches may be needed in sensitive areas, with methods selected to avoid crushing eggs or animals.

If an adult, juvenile, egg or suspected nest is found, stop work in the immediate area and obtain direction under the relevant approval and fauna management plan.

  • Retain moist litter, bark and refuges wherever the project allows.
  • Avoid stockpiling materials over potential breeding cover.
  • Do not relocate eggs or animals without appropriate approval and specialist direction.

Sheltering habitat: Likely shelter features

Adult shelter sites have not been well defined, but the species used ground cover, rocks, bark, walls, fences and buildings. Retain connected patches of cover and avoid creating unnecessary gaps between refuge features.

The species retreats to fringing ground cover when disturbed. It may also use bark, leaf litter, rocks, limestone pinnacles, wall crevices and dense low vegetation.

Specific burrows, hollows, caves and roosts have not been identified for this species. Inspect any feature that can conceal a small skink before it is removed or sealed.

  • Leaf litter and fallen bark.
  • Rock edges, limestone cracks and cliff features.
  • Dense ground cover and coastal thickets.
  • Wall, fence and building gaps.

Sheltering habitat: Refugia and connectivity

The species appears to be social, and several animals may interact within a small area. Retaining a cluster of refuges is preferable to retaining isolated features.

Where works are unavoidable, keep adjacent vegetation and cover intact and maintain safe movement routes between retained patches.

  • Mark retained rocks, bark, litter and low vegetation before site setup.
  • Keep access tracks and machinery away from refuge clusters where practicable.
  • Avoid unnecessary night lighting and disturbance around retained habitat.

Sheltering habitat: Handling and exclusion

Do not pick up, chase or confine a skink unless the action is authorised and supervised by a suitably qualified person. The species is small and can shed its tail when threatened.

If an animal enters a work area, pause the activity, isolate the immediate location and allow a fauna ecologist to determine the safest response.

  • Use exclusion only where it is designed and supervised for this species and site.
  • Check exclusion fencing regularly for trapped reptiles.
  • Record all captures, releases, injuries and mortalities and report them through the project approval process.

Threats: Introduced predators

The Blue-tailed Skink is Critically Endangered and may be extinct in the wild. Site controls should therefore aim to prevent even a single avoidable death, while supporting predator management and conservation recovery.

Increased predation by introduced species is considered the most likely broad driver of decline. Potential predators include feral cats, black rats, the Asian wolf snake, giant centipedes, yellow crazy ants and some birds.

Construction activity can increase risk by exposing animals, disturbing refuges and attracting predators through food waste or poor material storage.

  • Keep food scraps, waste and feed secure.
  • Do not create artificial shelter or breeding sites for rats, cats or other pest species.
  • Coordinate works with Christmas Island predator and ant control programs.

Threats: Habitat disturbance and clearing

Past habitat loss occurred through mining, development and roads, although habitat clearance alone was not considered the primary cause of the historical decline. Remaining natural and modified habitat may still be important.

Avoid clearing, demolition or rock removal until a threatened species assessment and pre-clearing check are complete.

  • Keep the work footprint as small as practicable.
  • Retain native vegetation, rock, bark, litter and wall features where possible.
  • Use staged clearing with fauna spotters and stop-work procedures.

Threats: Changed habitat and invasive species

Yellow crazy ant outbreaks have altered ground litter, understorey structure and invertebrate communities. Introduced reptiles, including the grass skink, may compete with the Blue-tailed Skink or alter habitat use.

Do not introduce soil, plants, animals or building materials between islands or conservation sites without biosecurity approval.

  • Control invasive species in accordance with approved island management programs.
  • Clean machinery and equipment before moving between work areas.
  • Prevent spread of ants, rats, geckos and other introduced animals.

Threats: Legal protection and response

The species is listed as Critically Endangered under the EPBC Act. An action that may significantly affect the species or its habitat may require referral or approval, and Christmas Island works may also be subject to park, territory and project-specific controls.

Treat every credible sighting as significant. Stop work in the immediate area, protect the animal and its habitat, and contact the project ecologist and relevant authority before work resumes.

  • Brief all workers and fauna spotters before works start.
  • Keep a clear incident and sighting reporting process on site.
  • Use only approved survey, capture, relocation and release methods.

Survey methodology: 1. Desktop assessment

The Blue-tailed Skink is a small, diurnal skink that uses ground cover, rocks, low vegetation, tree trunks, canopy vegetation and built surfaces. Wild populations are not currently known on Christmas Island, so surveys should be careful, repeatable and suited to detecting a very small remnant population.

Confirm the species distribution, tenure and listing status before planning works. The species is endemic to Christmas Island, although project mapping may show a Queensland occurrence or EVNT trigger that needs confirmation with the relevant regulator.

Check national, state and territory databases, recent Parks Australia records, ecological reports, proposed clearing, fire history, introduced predator activity and the presence of suitable habitat.

Treat all suitable habitat as potentially significant where records are old, access is poor or the site is connected to known or former habitat. Obtain advice from the relevant threatened species authority before relying on an absence record.

Species activity: Diurnal, with greatest activity and basking generally between 10 am and 2 pm.

Known range: Endemic to Christmas Island. No wild population is currently known.

  • Map rainforest edges, canopy gaps, coastal thickets, limestone cliffs, rock faces, ground cover, leaf litter, old mine areas, gardens, walls, fences, roadside vegetation and other modified habitat.
  • Record the date of the most recent confirmed record, the survey area, access constraints and any areas that could not be searched.

Survey methodology: 2. Visual searches

Search during the middle of the day, when animals are most likely to bask or forage. Walk slowly and scan exposed rock, cliff faces, tree trunks, low vegetation, leaf litter margins, walls, fences and building surfaces.

Pause at likely basking points and inspect crevices, ground cover and the base of rocks and trees. Check both open surfaces and nearby retreat cover.

Use a staged search. Begin with a broad habitat walk, then inspect all areas proposed for clearing or earthworks at close range. Search difficult terrain from safe vantage points and do not enter unstable cliffs or unsafe structures.

Detection behaviour: The species is conspicuous and bold when present, but current wild abundance is uncertain.

Foraging locations: Ground, exposed rocks, low vegetation, tree trunks and the tree canopy.

  • Use binoculars for high trunks and canopy edges where direct inspection is unsafe.
  • Search in warm, settled conditions where possible, and avoid relying on heavy rain, strong wind or very cool conditions when surface activity may be reduced.
  • Repeat searches on separate suitable days where the species would materially affect project decisions. Increase effort in rugged or inaccessible areas because absence is difficult to establish.

Survey methodology: 3. Targeted habitat and breeding searches

Inspect moist areas beneath leaf litter and bark, especially where these occur beside rocks, walls, fallen timber or dense ground cover. Eggs are laid in captivity in moist areas under leaf litter or bark.

Do not lift or remove cover without a fauna spotter catcher or ecologist directing the search. Replace every item carefully after inspection.

There are no confirmed colony, nest, roost or breeding place dimensions for this species. Treat a group of skinks, eggs, hatchlings or repeated use of one refuge as a potential breeding place until assessed.

Breeding period: Breeding is likely to occur throughout the year. Captive breeding has been recorded from October to April.

Clutch size: One to two eggs are reported.

  • Search for adults, juveniles, eggs, shed skins, tracks, feeding remains and repeated shelter use.
  • Photograph and mark each observation, without relying on close approach or capture for identification.
  • Use a qualified reptile specialist where identification is uncertain or where a possible breeding place is found.

Survey methodology: 4. Records and survey reporting

Record every observation, including animals found outside the clearing footprint. Record negative results with the same detail as positive results.

Use precise coordinates where permitted by sensitive species procedures. Restrict public circulation of location data and provide it to the regulator or land manager through the approved reporting pathway.

  • Record date, start and finish time, weather, temperature if measured, recent rain, observer names, search method, area searched, visibility, access limitations and habitat condition.
  • Record the animal's location, behaviour, direction of movement, group size, life stage, photographs, identification confidence and any signs of injury or predation.
  • Map proposed clearing, retained habitat, exclusion areas, breeding places, handling points and release locations.

Before habitat disturbance: 1. Avoidance and approvals

Avoidance is the preferred control for a species that may be extinct in the wild and has a very small or unknown remaining population. Resolve the approval pathway before vegetation removal, demolition, roadwork or ground disturbance begins.

Redesign the work to retain known or potential habitat wherever practicable. Retain native vegetation, rock faces, ground cover, leaf litter, moist refuges, tree trunks, walls and other surfaces used for basking or shelter.

Assess whether the action is likely to have a significant impact on a Critically Endangered species. Make an EPBC referral where the EPBC Act referral criteria may be met, and follow any approval conditions before starting work.

For Queensland projects, confirm whether the species or the affected population is covered by Queensland protected wildlife and EVNT provisions. Obtain an approved species management program where the work may tamper with a breeding place and the Queensland provisions apply.

Obtain all required state or territory wildlife permits, animal ethics approvals, translocation approvals and land manager permissions. On Christmas Island, confirm requirements with Parks Australia and the relevant Australian Government agency.

  • Do not assume that a Queensland map record removes the need to check Commonwealth requirements.
  • Keep approval documents, permit conditions, fauna handling authorities and contact details at the site office.
  • Refer any proposed translocation to the relevant threatened species authority. Do not move animals to a new site as a routine construction measure.

Before habitat disturbance: 2. Pre-clearance survey

Complete a pre-clearance search immediately before works, using the survey approach in this profile and any project approval conditions. Search all vegetation, rock, ground cover, walls, fences and structures within the disturbance area.

Where habitat is complex, inaccessible or likely to support a remnant population, use a reptile ecologist to set additional search effort and determine whether repeat visits are needed.

Inspect likely egg sites beneath leaf litter and bark without destroying cover. Mark and protect any suspected breeding place.

  • Search during the main activity period, generally 10 am to 2 pm, where safety and weather permit.
  • Complete the search in a logical grid or transect pattern and document the area covered.
  • Stop and obtain specialist advice if an animal, eggs, hatchlings, a repeatedly occupied refuge or a group of skinks is found.

Before habitat disturbance: 3. Timing, buffers and exclusion

There is no known migration period for the Blue-tailed Skink. Plan around the possibility of breeding at any time of year rather than applying a seasonal clearance window.

There is no species-specific standard buffer published for clearing or construction. Set a site-specific exclusion zone around each animal, breeding place and retained refuge, based on the approval, habitat, machinery reach, vibration, lighting and the advice of the fauna ecologist or regulator.

Fence exclusion areas before machinery arrives. Use visible, durable fencing and signs, and include the areas on construction plans and daily pre-start checks.

  • Keep machinery, spoil, traffic, storage, washdown and lighting out of exclusion areas.
  • Retain a connected path to nearby suitable habitat where an authorised relocation is approved.
  • Inspect fencing after storms, vehicle movements and other events that could create breaches.
  • Do not use smoke, chemicals, adhesive traps or other methods that could injure skinks or their prey.

Before habitat disturbance: 4. Induction and readiness

Induct all workers, operators, supervisors and subcontractors before entering the site. Explain the species' appearance, likely locations, legal status, exclusion controls and stop-work process.

Nominate the fauna spotter catcher and the person with authority to make wildlife decisions. Give both the supervisor and spotter catcher current approval conditions and emergency contacts.

  • Show workers the brown body and bright light-blue tail, and explain that the tail may be lost when the animal is threatened.
  • Require workers to stop, withdraw machinery and call the fauna spotter catcher if any suspected Blue-tailed Skink, egg or breeding place is found.
  • Keep a first aid kit for wildlife, secure containers, soft handling equipment and a quiet shaded holding area available where handling is authorised.

During habitat disturbance: 1. Sequential clearing

Use a slow, supervised clearing sequence and retain control of each work area. The fauna spotter catcher must be able to stop work immediately when an animal, egg or potential breeding place is detected.

Clear in small, defined stages, working from the disturbance edge towards retained habitat where this is consistent with the site design and fauna plan. Complete the fauna search and release each stage before opening the next.

Remove machinery hazards and loose materials from the search area before inspection. Check rocks, ground cover, leaf litter, bark, walls, fences, tree trunks and low vegetation as they are exposed.

Use low-impact methods around retained habitat and suspected refuges. Do not push debris into exclusion areas or bury potential breeding places.

  • Keep the spotter catcher within effective viewing distance of the active work front.
  • Pause work during poor visibility, unsafe access, uncontrolled dust or other conditions that prevent effective fauna detection.
  • Reinspect the work area after overnight shutdowns if cover has been moved or the work front has changed.

During habitat disturbance: 2. Stop-work and handling

The fauna spotter catcher must have authority to stop work without delay. Any worker may call a stop if they see a suspected animal, egg or breeding place.

Only people authorised under the relevant permit, approval or management plan may catch, handle, hold or release a Blue-tailed Skink. Keep handling brief and avoid grasping the tail, as the species can shed it when threatened.

Photograph the animal from a safe distance before capture where this will not delay protection or increase risk.

  • Stop machinery and isolate the immediate area.
  • Keep people, pets and vehicles away, and provide shade and quiet.
  • Contact the project ecologist and regulator or land manager if the animal cannot be safely identified, captured or released under the approval.
  • Use a clean, secure, ventilated container with suitable refuge material only when handling is authorised.

During habitat disturbance: 3. Animals, eggs and breeding places

If an active breeding place, eggs, hatchlings, a group of animals or a repeatedly used refuge is found, stop all disturbance within the exclusion area. Do not excavate, relocate cover or resume work until the approved procedure has been confirmed.

Leave eggs in place wherever practicable. Moving eggs or animals requires specific authorisation and a method approved by the relevant authority.

If relocation is approved, release animals into nearby suitable habitat selected by the ecologist. Record the location, habitat, time and condition of every animal.

  • Mark the location without placing stakes, tape or equipment on the breeding place or refuge.
  • Extend protection to associated leaf litter, bark, rocks and ground cover where these may support eggs or shelter.
  • Do not create a new release site, or transport animals between islands or regions, without formal translocation approval.
  • Report any suspected illegal disturbance or unauthorised handling through the project incident pathway and to the relevant regulator.

During habitat disturbance: 4. Injury and incident response

Treat an injured animal as a wildlife incident. Prevent further harm, keep the animal quiet and shaded, and arrange assessment by an authorised wildlife carer or reptile veterinarian through the project ecologist.

Do not feed, water, medicate or release an injured animal unless directed by the authorised carer or veterinarian and allowed by the permit.

  • Record the location, apparent cause, injuries, photographs, time found, handler and destination.
  • If the animal is dead, do not discard it. Secure it as directed by the relevant authority and record the find.
  • Notify the site supervisor and fauna ecologist before work resumes in the affected area.
  • Review whether machinery, fencing, lighting, access, clearing sequence or supervision needs to change.

During habitat disturbance: 5. Daily records

Maintain a daily fauna log for each work stage. Submit records in the format required by the approval, permit, species management program or land manager.

Keep sensitive location data secure and share it only with people who need it for compliance, protection or conservation work.

  • Record weather, work area, search effort, start and finish times, observers, animals detected, breeding places, handling, relocation, injuries, deaths, stop-work events and work resumed time.
  • Attach photographs, coordinates, maps and release details.
  • Have the spotter catcher and site supervisor sign the daily record.

After habitat disturbance: 1. Post-clearance checks

Post-clearance checks confirm that no animal, egg or refuge was overlooked and that controls worked as intended. Use the results to improve the next work stage and meet all approval reporting duties.

After each clearing stage, inspect the completed footprint, retained edge and any stockpiled vegetation or disturbed ground. Check exposed rocks, bark, leaf litter, walls, fences, tree trunks, low vegetation and likely moist refuges.

Complete a final check before demobilising fauna supervision from the stage. Repeat checks if machinery has shifted cover, materials or spoil after the initial inspection.

  • Search during the main daytime activity period where practicable.
  • Check exclusion fencing and retained habitat for trapped or displaced animals.
  • Record the area checked, access limitations and the result, including a nil result.

After habitat disturbance: 2. Relocated animals and retained habitat

Inspect approved release locations after relocation for signs of survival, shelter use and further movement. Do not repeatedly handle animals simply to confirm presence.

Maintain the approved refuge and habitat conditions at the release site. Prevent vehicles, stockpiles, weeds, fire and uncontrolled access from degrading it.

  • Record post-release observations, condition, behaviour and any evidence of predation.
  • Report mortalities, animals outside the approved release area or evidence of failed establishment to the project ecologist and relevant authority.
  • Do not supplement, recapture or move animals without approval.

After habitat disturbance: 3. Compliance reporting

Prepare a completion report that links each work stage to the approval conditions and fauna management measures. Submit it within the required timeframe.

Include all detections and incidents, not only confirmed live animals.

  • Provide maps of cleared and retained areas, exclusion zones, breeding places and release sites.
  • Provide survey effort, weather, personnel, permits, handling records, injuries, deaths, breaches and corrective actions.
  • Store original photographs, field sheets and GPS data in the project environmental record.
  • Notify the regulator promptly of any reportable incident or breach.

After habitat disturbance: 4. Incident review

Hold a short review after each incident and at the end of the clearing program. Include the spotter catcher, site supervisor, ecologist and construction manager.

Change the method before the next stage if the search was obstructed, animals were detected late, exclusion fencing failed or handling was unsafe.

  • Check whether work timing, lighting, machinery speed, clearing direction, crew numbers or search coverage should change.
  • Update the induction and daily pre-start briefing when a new risk is identified.
  • Retain lessons and monitoring results for future work on Christmas Island or other approved conservation sites.

Rehabilitation actions: 1. Restore habitat structure

Rehabilitation should restore the small-scale features used for basking, foraging and shelter, rather than relying only on broad vegetation cover. Designs must reflect the species' poorly understood refuge requirements and should be checked by a threatened reptile ecologist.

Reinstate native vegetation, low ground cover, leaf litter, bark, rocks and moist refuges in a way that reflects the surrounding habitat. Link restored areas with retained native vegetation and avoid creating isolated strips where practicable.

Use local native plant material and retain habitat features already used by skinks. Include rainforest edges, canopy gaps, coastal thickets, limestone features and suitable modified surfaces where these are part of the local setting.

Do not compact or over-clear the ground beneath retained trees and shrubs. Keep natural retreat cover available.

  • Replace leaf litter and bark carefully in moist, shaded locations where approved.
  • Retain stable rocks, walls and rough surfaces that provide basking or foraging sites.
  • Prevent erosion, sediment deposition and altered drainage from covering refuges or drying moist habitat.
  • Keep rehabilitation free of domestic animals and reduce access by feral predators where the land manager has an approved control program.

Rehabilitation actions: 2. Breeding and refuge structures

Standard nest boxes, bat boxes and roost structures are not a known requirement for this skink and should not be installed as a generic measure. The species is reported to lay eggs in moist areas under leaf litter or bark.

Where a breeding or refuge structure is needed, design a shallow, ground-level artificial refuge with natural bark, leaf litter and suitable moisture conditions, subject to approval and ecologist advice. Keep it stable, inspectable and protected from flooding, fire and predators.

Do not place artificial structures over known eggs or disturb natural breeding places to install them.

  • Trial any artificial nest site at a conservation or rehabilitation site before using it across a project area.
  • Record design, materials, location, moisture, shade, inspection dates and evidence of use.
  • Remove or modify structures that increase predator access, trap animals, overheat or become persistently wet.
  • Do not use bat boxes, bird nest boxes or elevated roost structures unless a specialist confirms that the design is suitable for this species.

Rehabilitation actions: 3. Weeds, predators and food resources

Control weeds without removing the low vegetation and ground cover needed for shelter. Use methods that avoid toxic residues, smoke, excessive soil disturbance and harm to invertebrate prey.

Manage feral cats and other introduced predators through approved, landscape-scale programs. Consider black rats, introduced reptiles, giant centipedes, predatory birds and yellow crazy ants in the site risk assessment.

Retain a varied native plant structure that supports small invertebrates, including the species' recorded prey such as crickets, grasshoppers, termites, spiders and moths.

  • Use hand removal or targeted treatment near known refuges where practicable.
  • Keep pesticides, baits and ant control products away from skink habitat unless their use is approved and assessed for non-target impacts.
  • Inspect rehabilitation for predator sign, yellow crazy ant activity, invasive reptiles and declining invertebrate abundance.
  • Avoid routine removal of leaf litter where it provides shelter or potential egg sites.

Rehabilitation actions: 4. Water, fire and lighting

Maintain natural drainage and small moist refuges without creating permanent standing water that could favour predators or degrade habitat. The species' breeding and shelter requirements are poorly understood, so monitor any changed hydrology closely.

Manage fire to protect retained and rehabilitated refuges. Do not burn leaf litter, bark, ground cover or coastal thickets used for shelter unless the action forms part of an approved ecological fire program.

Limit artificial light at night around retained and rehabilitated habitat. The species is diurnal, but lighting can alter invertebrate activity and predator behaviour.

  • Use shielding, low-intensity fittings and timers where lighting cannot be avoided.
  • Prevent runoff, sediment and construction water entering refuges.
  • Inspect after heavy rain, fire, drought and major maintenance works.
  • Repair damaged refuges and exclusion fencing promptly.

Rehabilitation actions: 5. Long-term monitoring

Monitor rehabilitation for establishment of habitat, invertebrate resources, predator activity and any Blue-tailed Skink detections. Set the monitoring design with the relevant authority and threatened reptile ecologist because a wild population is not currently known.

Use the same search locations, timing and recording methods across monitoring events so results can be compared. Do not treat a single nil survey as proof of local absence.

  • Search suitable surfaces and refuges during the main activity period, generally 10 am to 2 pm, under comparable conditions where practicable.
  • Record habitat condition, ground cover, leaf litter, bark, moisture, weeds, predator signs, invertebrate observations, skink detections and survey effort.
  • Review monitoring results at agreed milestones and change weed, predator, fire, lighting or refuge management when evidence shows a problem.
  • Provide sensitive species records to the relevant conservation authority and keep them secure in project databases.

Sources