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White-crowned Snake (Cacophis harriettae)

The White-crowned Snake is a small, nocturnal elapid that shelters in damp ground cover and feeds mainly on small lizards. It occurs from around Rockhampton in Queensland to north-eastern New South Wales, and may be encountered in retained forest, woodland, heath, gardens and other damp areas on development sites.

Conservation status

New South Wales, Biodiversity Conservation Act 2016: Vulnerable.

Breeding season

The species is egg-laying, but the supplied documents do not record months for mating, gravid females, egg laying, incubation, hatching or adult activity. For clearing planning, treat all months as potential risk, particularly where leaf litter, decaying logs or other ground shelter will be disturbed.

Reproductive mode: Oviparous, meaning females lay eggs.

Clutch size: Usually 2 to 10 eggs, with an average of about 5 to 5.1 eggs. One source reports 2 to 15 eggs.

Incubation: Not recorded.

Size at hatching: Hatchlings are 142 mm snout to vent, or about 145 mm from nose to tail.

Age at maturity: Not recorded.

Nest or egg sites: Specific nest sites are not recorded. Eggs and shelters are associated with ground cover such as leaf litter and decaying logs.

Breeding frequency: Not recorded.

Confirm timing locally before works, particularly after rainfall or during periods of suitable temperature, because these triggers may affect snake activity even though species-specific monthly data are unavailable.

  • Mating: Mating months are not recorded. Use a year-round planning assumption because no narrower breeding window is supported for this species.
  • Gravid females: The presence and timing of gravid females are not recorded. Treat females carrying eggs as a possible year-round clearing risk where shelter is removed.
  • Egg laying: The species lays eggs, with documented clutches of 2 to 10 eggs and an average of about 5 eggs, but egg-laying months and nest sites are not recorded. Retain and inspect leaf litter, decaying logs and other ground debris before clearing.
  • Incubation: Incubation length and months are not recorded. Eggs may be present whenever ground shelter is disturbed, so apply a year-round precautionary window.
  • Hatchlings: Hatching months and juvenile emergence are not recorded. Hatchlings are about 142 mm snout to vent, or about 145 mm from nose to tail, and may be concealed in ground cover throughout the year.
  • Active period: The species shelters in leaf litter and under decaying logs during the day and forages at night. No seasonal activity months or peaks are recorded, so surface activity should be expected in any month, subject to local conditions.
  • Winter inactivity: Brumation, hibernation and seasonal inactivity are not recorded. Do not assume winter sheltering makes clearing safe, because snakes may remain concealed in logs, litter and other ground debris.
  • Highest clearing risk: No month-specific peak is documented. Risk applies year round because clearing can affect eggs, hatchlings, sheltering snakes and nocturnally active adults in leaf litter, decaying logs and other surface cover.

Identification

The White-crowned Snake is a small, dark snake with a distinctive pale crown marking. It is venomous but is not considered dangerous to people by the Queensland Government.

Adults are dark grey, dark brown or steely grey above, with a light grey belly. A broad white or yellowish band crosses the neck and sweeps forward around the sides of the head and across the snout, forming the crown. The snake is slender and usually grows to about 40 cm.

It is mainly nocturnal and reclusive. During the day it is likely to remain under leaf litter, decaying logs, damp debris or other surface cover. At night it emerges to hunt small lizards.

Identification: Similar species

The Dwarf-crowned Snake, Cacophis krefftii, is a similar dark crowned snake. It is generally shorter, at about 30 to 35 cm, and has a narrower white band around the head. Identification should not rely on size alone.

Colour and markings can vary between individual snakes. Treat any unidentified snake as potentially venomous, do not handle it, and use an appropriately trained fauna spotter catcher for capture and relocation.

Identification: Sex and field signs

Females are larger than males, although the supplied sources do not provide separate adult size ranges.

The supplied sources do not describe diagnostic tracks, scats, calls, nests, eyeshine or sloughs. In site inspections, a live snake, a shed skin with the crown pattern, or a snake sheltering beneath logs, litter or damp ground debris is more useful evidence than indirect signs.

Sexual size difference: Females are larger than males.

Diagnostic indirect signs: No species-specific tracks, scats, calls, nests or eyeshine are described in the supplied sources.

Distribution: States and regional range

The documented range extends along the eastern Australian coast from central Queensland to north-eastern New South Wales. The supplied sources do not provide a national population estimate or a quantified population trend.

In Queensland, the species is recorded from around Rockhampton south through the state to the south-east, including the Brisbane area. In New South Wales, the supplied material identifies the species in the north-east of the state.

The supplied sources do not name formal IBRA bioregions. They also do not provide a complete mapped state range, so project assessments should use current state records and local habitat assessment rather than relying on the broad range alone.

Distribution: Known strongholds and subpopulations

The regional disturbance assessment identifies clusters of known records in the Upper North East region of New South Wales and places species equity target areas around those clusters and their core habitat.

The Queensland Government describes the species as common in Brisbane, including inner-city areas, and records it in damp gardens and compost heaps as well as native habitat. The supplied sources do not define separate genetic subpopulations or estimate the size of these concentrations.

Distribution: Population information

Population size: No national or regional population estimate is given in the supplied sources.

Population trend: No quantified population trend is given. The regional assessment identifies clearing, fire, loss of logs and litter, urban development and roadkill as relevant disturbances.

Modelled density used in: 0.020 animals per hectare across the listed habitat quality classes for the Cacophis harriettae SETAs.

Habitat: Habitat types

White-crowned Snakes use a range of forest, woodland and heath habitats where damp ground conditions and surface cover are retained. They can also occupy modified sites when suitable shelter remains.

The regional habitat assessment lists wet sclerophyll forest, dry sclerophyll forest, woodland and heath as breeding habitat. It identifies open forest and woodland as dispersal habitat.

Queensland records also show that the species can occur in damp gardens and compost heaps, including urban areas. Modified habitat should not be dismissed where logs, litter and other damp surface refuges remain.

Habitat: Structure and site conditions

The most relevant habitat features are fallen logs, leaf litter, damp ground debris and other surface shelter. The species is associated with wet and dry forest, woodland and heath rather than a single vegetation community.

The supplied sources describe the species as occurring at low to medium elevation, but do not provide a numeric elevation range or a lower and upper climatic limit.

Elevation: Low to medium elevation; no numeric range is provided.

Climate and moisture: The species uses warm, moist areas and damp sites, but also occurs in dry sclerophyll forest and woodland.

  • Retain connected patches of open forest and woodland where practicable.
  • Avoid removing fallen logs, deep litter and damp surface debris from retained habitat.
  • Inspect log piles, litter, compost heaps and other damp ground cover before disturbance.

Foraging habitat: Diet

The White-crowned Snake is a nocturnal reptile predator. It searches ground cover and sheltered sites for small lizards and their eggs.

Its main prey is small lizards, particularly skinks, and it also takes lizard eggs. The species may constrict slippery lizards until venom takes effect.

The supplied sources do not identify particular food plants because the species is carnivorous. Retaining skink habitat, leaf litter and fallen timber therefore supports its prey base.

Main prey: Small lizards, mainly skinks.

Other recorded food: Lizard eggs.

Trophic level: Estimated trophic level 1 in the assessment.

Foraging habitat: Foraging behaviour

Foraging occurs at night after the snake leaves daytime shelter. It searches damp ground cover, litter, logs and nearby sheltered vegetation for sleeping or concealed lizards.

No measured home range, nightly movement distance or foraging distance is provided. Open forest and woodland are identified as dispersal habitat, so clearing should avoid creating isolated gaps between retained shelter and prey habitat.

  • Keep fallen timber and litter in place in retained habitat.
  • Avoid disturbing damp ground refuges at night when snakes may be active.
  • Inspect habitat adjoining cleared areas because the species can use modified sites if suitable cover remains.

Breeding habitat: Breeding biology

Egg-laying occurs in ground-level shelter. Logs and leaf litter are the main breeding habitat features identified for this species.

Breeding mode: Egg-laying.

Season: The supplied sources do not specify mating or egg-laying months.

Clutch size: Usually 2 to 10 eggs, with an average of about 5 eggs.

Gestation or incubation: Not specified in the supplied sources.

Age at maturity: Not specified in the supplied sources.

Lifespan or reproductive longevity: Estimated reproductive lifespan of 1 to 7 years, with a mean of 4 years. This is not a direct estimate of total lifespan.

Breeding habitat: Breeding habitat features

Breeding habitat includes logs and leaf litter in wet sclerophyll forest, dry sclerophyll forest, woodland and heath. These features provide protected places for eggs and reduce exposure at ground level.

The supplied sources do not identify nest dimensions, egg-laying depth, preferred log diameter or a specific breeding-season shelter type.

  • Retain fallen logs and continuous leaf litter in areas of suitable habitat.
  • Search beneath and within surface debris before clearing, rolling logs or removing litter.
  • Treat damp ground cover in retained forest, woodland and heath as potential breeding habitat.

Sheltering habitat: Natural refuges

Daytime shelter is provided by ground-level cover, especially leaf litter and decaying logs. The species may also use damp artificial refuges in developed areas.

The principal shelters are fallen logs, leaf litter and other surface cover. Queensland guidance also notes use of damp places under rocks and in other ground debris.

The species basks in sheltered sites in trees, but the supplied sources do not describe preferred tree species, height, branch diameter or cavity dimensions.

Shelter size: No refuge, log or litter dimensions are provided.

Tree shelter: Sheltered sites in trees are used for basking, but no structural measurements are given.

  • Check beneath logs, rocks, litter piles, bark, compost and other damp debris before moving or removing them.
  • Keep retained logs and litter undisturbed where they form part of a habitat patch.
  • Use a trained fauna spotter catcher for any snake found during clearing or construction.

Sheltering habitat: Construction site relevance

Surface shelter can persist in gardens, compost heaps and urban remnants, so the species may be present in areas that appear highly modified. Clearing of logs and litter can remove both daytime refuges and breeding habitat.

A practical inspection should cover the proposed clearing footprint, access tracks, stockpile areas and the edge of retained vegetation. Particular attention is warranted in damp ground cover and around log piles.

Threats: Clearing and habitat loss

The regional assessment ranks fire, clearing and loss of ground cover among the main disturbances affecting White-crowned Snakes. Urban clearing, firewood collection and roadkill are also relevant to project planning.

Clearing for agriculture is ranked as a high disturbance, and clearing for urban development is also identified. The regional assessment records loss of logs and litter and changes to the understorey as specific pathways of impact.

Fragmentation can reduce the continuity of open forest and woodland used for dispersal. The assessment places species equity target areas around clusters of known records and core habitat in the Upper North East.

  • Avoid clearing fallen logs, litter and other surface cover unnecessarily.
  • Keep retained habitat connected to adjoining open forest and woodland where practicable.
  • Use pre-clearing surveys and spotter catcher controls across the full work footprint, including temporary access and storage areas.

Threats: Fire and ground-cover change

Any fire is ranked as a high disturbance in the regional assessment. Grazing and associated burning can remove logs and litter and alter understorey structure.

Repeated burning, intense site preparation or heavy machinery use can reduce the damp surface refuges used for shelter and egg laying.

  • Retain unburnt refuge patches where fire management allows.
  • Do not burn cleared material adjacent to retained litter and log habitat.
  • Reinspect disturbed edges after burning or major ground-cover removal.

Threats: Roads, predators and other disturbances

Roadkill is identified in the regional assessment, although it is ranked lower than fire and clearing. New roads and repeated vehicle movements can increase mortality where snakes move between habitat patches.

Predation by introduced species is identified as a disturbance. Firewood collection can remove fallen logs and is also listed as a threat. The supplied sources do not identify a disease threat or a species-specific hydrology threat.

  • Use low-speed controls and fauna awareness measures on access roads through suitable habitat.
  • Do not collect or relocate firewood from retained habitat without ecological approval.
  • Record and report injured or dead snakes to the project environmental officer and relevant authorities.

Survey methodology: 1. Nocturnal spotlighting

White-crowned Snakes are small, nocturnal elapids associated with damp ground debris and surface shelter. Survey design should target wet and dry sclerophyll forest, woodland and heath, with particular attention to logs, leaf litter and other sheltered sites.

Conduct nocturnal searches because White-crowned Snakes emerge at night to forage for small lizards.

Search damp areas, garden or compost-like ground debris, logs, rocks and retained forest edges within the proposed disturbance area and nearby retained habitat.

Record weather, start and finish times, search route, habitat type and all reptiles detected.

Survey methodology: 2. Daytime shelter searches

Inspect leaf litter, fallen logs and other surface shelter during the day, when the species is likely to be concealed.

Lift or roll shelter objects carefully, inspect the underside and surrounding litter, and replace each object in its original position.

Use a fauna spotter catcher where searches may expose or handle a snake, and do not place hands into concealed spaces.

Survey methodology: 3. Habitat and connectivity assessment

Map wet sclerophyll forest, dry sclerophyll forest, woodland and heath that contain logs, litter and other surface shelter.

Map clusters of records and connected open forest or woodland between retained habitat areas, because the species disperses through open forest and woodland.

Assess whether clearing, roads, machinery access or loss of ground cover will remove shelter or isolate retained habitat.

Adult length: Usually no more than 38 centimetres, with Queensland Government information reporting growth to about 40 centimetres.

Known prey: Small lizards, mainly skinks, and lizard eggs.

Survey methodology: Minimum effort and reporting

  • Use a project-specific survey plan approved by the project ecologist because the supplied documents do not prescribe a species-specific number of nights, hours, trap nights, transect length or search area for White-crowned Snakes.
  • Repeat searches under suitable nocturnal conditions and after relevant habitat features have been exposed or disturbed.
  • Record survey dates, personnel, qualifications, methods, effort, weather, locations, habitat, photographs and search outcomes.
  • Submit confirmed records, including credible non-detections where required by the project, to the relevant state wildlife database.
  • Check current state survey guidance and approval conditions before finalising effort, because the species occurs from around Rockhampton in Queensland to north-eastern New South Wales.

Before habitat disturbance: Avoid and minimise

Plan clearing around the species' dependence on logs, litter and ground cover. Avoid removing damp surface shelter and retain connected forest or woodland wherever practicable.

  • Retain wet and dry sclerophyll forest, woodland and heath containing fallen logs, leaf litter and other surface shelter.
  • Avoid unnecessary removal of logs, litter, rocks and low ground vegetation from the work area and retained habitat.
  • Keep retained habitat connected through open forest or woodland, rather than creating isolated patches or broad cleared gaps.
  • Use the smallest practicable clearing footprint and locate access tracks, laydown areas and stockpiles outside retained snake habitat.

Before habitat disturbance: Approvals and work planning

  • Confirm the current Commonwealth and state conservation status at the project location before work starts.
  • Obtain any required state wildlife permits, scientific licences, animal ethics approvals and translocation permissions before surveying, handling or relocating snakes.
  • Determine whether the action requires an EPBC Act referral if a nationally listed species or other protected matter may be affected.
  • Prepare a fauna management plan covering survey effort, spotter catcher authority, stop-work triggers, handling, relocation, injury response, records and escalation.
  • Stage clearing so that retained habitat and escape routes remain available while each work area is inspected and cleared.

Before habitat disturbance: Site preparation

  • Complete a pre-clearance inspection of logs, litter, rocks, damp ground debris and other shelter immediately before clearing.
  • Mark retained logs, litter zones, habitat edges, connectivity corridors and no-go areas on plans and in the field.
  • Install exclusion fencing only where it will not trap snakes or block movement into retained habitat, and inspect the fence line for animals before sealing or commencing work.
  • Brief all workers that the species is venomous but not considered dangerous to humans, and that only authorised personnel may approach or handle it.

During habitat disturbance: Daily controls and machinery interface

Use a controlled, low-speed clearing process with a fauna spotter catcher present. The main controls are careful treatment of ground shelter, clear machinery communication and immediate action when a snake is found.

  • Inspect the work area, access routes and exclusion fencing each day before machinery enters.
  • Keep the fauna spotter catcher in visual communication with machine operators and stop machinery whenever the spotter signals.
  • Clear progressively in small sections towards retained habitat, where the site plan and safety assessment identify a suitable escape direction.
  • Do not allow workers to chase, corner, catch or kill a snake, and keep people and machinery clear of the animal until the authorised handler gives direction.

During habitat disturbance: Habitat feature handling

  • Treat fallen logs, deep litter, rocks and damp surface debris as potential shelter and inspect them before movement.
  • Move logs and rocks only under the direction of the fauna spotter catcher, using slow mechanical handling and a clear exclusion zone.
  • Do not mulch or burn habitat features until they have been inspected and the spotter catcher has cleared the area.
  • Prevent sediment, spoil, fuel and waste from entering damp retained habitat or blocking movement through open forest and woodland.

During habitat disturbance: Animal found, injury and stop-work response

  • Stop work in the immediate area when a White-crowned Snake is found and keep workers back until the authorised fauna spotter catcher assesses it.
  • Do not handle the snake unless the person is authorised, licensed and equipped under the project fauna management plan and relevant law.
  • Allow the snake to move into nearby retained habitat where safe, or relocate it only under an approved project procedure and any required permit.
  • Place an injured snake in a secure, labelled container suitable for the species and arrange prompt assessment by a veterinarian or authorised wildlife carer.
  • Stop work and escalate to the project ecologist if the snake cannot safely leave, if more than one animal is found, if exclusion fencing traps an animal, or if clearing is likely to remove an occupied shelter area.
  • Treat a bite or suspected bite as a medical emergency and follow the site's first aid and emergency response procedure.

During habitat disturbance: Records and release

  • Record every observation, including date, time, coordinates, habitat, behaviour, photographs, action taken, handler and release location.
  • Record injured, dead and relocated animals separately, including the likely cause and any permit or incident number.
  • Release a recovered animal only at an ecologist-approved nearby retained site with suitable logs, litter and ground cover, and record the location and time.

After habitat disturbance: Post-clearance checks

Post-clearance work should confirm that no animals remain in disturbed habitat and that retained shelter and movement routes are still functioning. Continue controls until the site is stable and all approval conditions are met.

  • Inspect the cleared footprint, retained habitat edge, access routes and exclusion fencing after each clearing stage.
  • Search remaining logs, litter and other disturbed surface shelter before it is removed, stockpiled or reused.
  • Check that relocated or released animals were recorded and that any injured animals were transferred to an authorised care provider.

After habitat disturbance: Monitoring and maintenance

  • Monitor retained wet and dry forest, woodland and heath for continued ground cover, logs, litter and damp shelter during construction and rehabilitation.
  • Inspect fencing, drainage, stockpiles and access controls after heavy rain, earthworks and major changes to the site.
  • Repeat nocturnal and shelter searches if clearing was staged, if habitat was disturbed after the original inspection, or if new records are reported.

After habitat disturbance: Reporting and offsets

  • Provide the approval authority and project ecologist with survey effort, records, incidents, relocations, injuries, mortalities, clearance areas and corrective actions.
  • Submit confirmed records to the relevant state wildlife database and retain photographs and coordinates with the project environmental records.
  • Implement any approved offset, restoration or compensatory habitat measure required by Commonwealth, state or local approval conditions.

Rehabilitation actions: Restore shelter and vegetation

Rehabilitation should rebuild the ground-level shelter used for breeding, feeding and daytime refuge. It should also restore connected native vegetation and reduce the disturbance pressures identified for the species.

  • Re-establish native wet and dry sclerophyll forest, woodland or heath appropriate to the local reference community.
  • Retain or reinstate fallen logs, leaf litter and other surface shelter across rehabilitation areas, with placement directed by the project ecologist.
  • Avoid leaving rehabilitation areas uniformly bare, heavily compacted or dominated by short ground cover, because the species uses logs, litter and other surface shelter.
  • Maintain connected open forest and woodland between rehabilitation areas and retained habitat.

Rehabilitation actions: Manage fire, grazing and predators

  • Develop a site-specific fire regime with the land manager that avoids unnecessary loss of litter, logs and understorey structure.
  • Prevent grazing and associated burning from removing ground cover or changing the understorey structure in retained and rehabilitated habitat.
  • Control introduced predators in accordance with approved fauna and biosecurity procedures, particularly where monitoring identifies predation risk.
  • Control weeds and prevent garden, compost, soil or mulch materials from introducing new pests or altering damp habitat conditions.

Rehabilitation actions: Monitoring and success measures

  • Inspect rehabilitation after construction, after major rain and at the monitoring intervals set by the approval or fauna management plan.
  • Measure survival and cover of locally appropriate native vegetation, retention of logs and litter, connectivity to retained habitat, weed cover, signs of grazing and predator activity.
  • Use repeat nocturnal searches and daytime shelter inspections to assess whether White-crowned Snakes and their small-lizard prey are using restored habitat.
  • Investigate any decline in ground cover, logs, litter or snake records and apply corrective actions such as supplementary habitat placement, weed control or revised fire and grazing management.

Sources