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Southern Death Adder (Acanthophis antarcticus)

The Southern Death Adder is a heavy-bodied, large-headed elapid snake of eastern and south-eastern Australia. It uses leaf litter, logs, rocks and low ground vegetation for breeding, shelter and ambush foraging, so clearing, fire, firewood removal and loss of ground cover can affect it on development sites.

Conservation status

Queensland, Nature Conservation Act 1992: Vulnerable.

Victoria, Flora and Fauna Guarantee Act 1988: Critically endangered.

Breeding season

Southern Death Adders usually mate in spring, with births mainly from summer to early autumn. Clearing risk remains year round because adults, gravid females and newborns use leaf litter, logs, rocks and other ground cover for shelter.

Reproductive mode: Live-bearing, or viviparous.

Litter size: Two to 42 young have been reported. Other sources report typical litters of 10 to 20, with averages of about 8 or 17.

Gestation: Reported as 6 to 9 months, or about 139 days.

Size at birth: Newborns are reported at about 12 to 18 cm long.

Age at maturity: Males mature at about 24 months. Females mature at about 42 months.

Nest or egg sites: Eggs are not laid. Females have been observed moving under leaves or logs before giving birth, but a defined birth site is not recorded.

Breeding frequency: Females generally reproduce every second year, although annual breeding has been reported in some captive females.

Confirm timing locally before clearing by considering recent rainfall, temperature, regional climate and night survey results, because activity and birth timing vary across the species' Australian range.

  • Mating: Mating usually occurs in spring, particularly September to November. Some mating activity and successful matings have also been reported in autumn, and mating can occur at other times of year.
  • Gravid females: Females may carry developing young for about 6 to 9 months, or about 139 days. The main gravid period follows autumn or spring mating and extends into the birth period from late summer to early autumn.
  • Births: Births are typically reported in February and March. Other records place births from December to March or from late January to early May, so the broader period is December to May.
  • Newborns: Newborns are most likely to be encountered around February and March, following the main birth period. They may also be present from December to May because reported birth timing varies between sources.
  • Active period: The species can be active throughout the year and may move by day, although it is most often encountered at night. Activity is expected to be higher during the warmer breeding period from September to March, particularly where temperature permits movement.
  • Winter inactivity: No species-specific wild brumation or hibernation period is recorded. In cooler southern areas, winter temperatures from June to August are likely to reduce surface activity and increase reliance on litter, logs, rocks and other refuges; this pattern may not apply across warmer northern areas.
  • Highest clearing risk: Clearing risk applies in every month because ground cover provides shelter and ambush sites year round. Risk is heightened from September to May by mating, gravid females and newborns, while cooler-month animals may be less able to escape machinery from June to August.

Identification

This species is a ground-dwelling, ambush-foraging snake. Identification should be confirmed by an experienced reptile handler because colour varies geographically and within populations.

The Southern Death Adder has a heavy body and a large head. Colour varies between geographic areas and between individuals, and one study reported seasonal colour change in this species.

Identification: Size and field recognition

The supplied documents do not provide body length, mass, scale counts or reliable field measurements for this species. They also do not provide a diagnostic comparison with other Australian snakes. Do not rely on colour alone for identification.

  • Treat any short, heavy-bodied snake with a broad head found in suitable ground-cover habitat as requiring expert confirmation.
  • Use photographs and a precise location record where this can be done safely, and do not handle the snake unless authorised and appropriately trained.

Identification: Field signs

The supplied documents do not report diagnostic tracks, scats, calls, nests, sloughs or eyeshine for this species. A live animal, shed skin or confirmed record is therefore more reliable than indirect signs during clearing works.

  • Record the exact location, habitat structure and disturbance status for each observation.
  • Search carefully around leaf litter, logs, rocks, rock crevices and low ground vegetation before disturbing these features.

Distribution: States and regions

The documented range is in eastern and south-eastern Australia. The supplied sources do not provide a complete national distribution map or a reliable population estimate.

The species occurs in Victoria, New South Wales and southern Queensland. In the north-east New South Wales assessment, it was considered north of the Hunter River in the UNE region and was not assessed in the LNE region.

  • The southern Australian operational taxon includes Victoria, New South Wales and southern Queensland.
  • The north-east New South Wales assessment identifies Acanthophis antarcticus north of the Hunter as a species assessed in the UNE region.

Distribution: Strongholds and trend

A Southern CRA assessment reported that the species was unlikely to persist in the assessed landscape, with inappropriate fire regimes or processes that remove leaf litter identified as possible contributing factors. The same source identified better prospects for persistence in eastern parts of the assessment region than in western parts, but this is not a national population assessment.

National population size: Not provided in the supplied documents.

Population trend: A localised decline and persistence concern are reported for parts of the Southern CRA assessment region; no national trend is provided.

Validated-record buffer: 2 km radius around validated post-1970 records in the UNE and LNE assessment area.

  • Use validated records and habitat checks to define site constraints rather than assuming absence from a cleared or modified site.
  • For the UNE and LNE assessment, apply the documented 2 km radius buffer around validated post-1970 records, noting the stated 1 km record accuracy.

Habitat: Vegetation communities

The species uses a wide range of terrestrial vegetation communities where ground cover remains intact. Habitat quality depends strongly on surface structure rather than canopy type alone.

Documented habitat includes wet and dry sclerophyll forest, subtropical rainforest, dry rainforest and heath. The species is recorded across low to high elevations in the habitat requirements assessment.

Habitat: Structural features

Important habitat features include leaf litter, rocks, rock crevices, logs, surface cover and ground-layer vegetation. Retention of ground habitat, habitat corridors, heath and scrub, rocky outcrops and riparian buffers were identified as relevant protective measures in the reviewed forest practices.

  • Map and retain continuous ground cover before clearing.
  • Retain logs, fallen timber, rocks, rock outcrops, deep litter and low vegetation where practicable.
  • Avoid treating retained ground habitat as waste material or firewood during site preparation.

Habitat: Climate and elevation

The supplied habitat assessment identifies use of both wet and dry forest environments and a low to high elevation range. It does not provide a narrower climatic limit or a minimum patch size.

Foraging habitat: Diet

The Southern Death Adder is an ambush predator that waits within ground cover. Its feeding habitat must provide both concealment and access to suitable small vertebrate prey.

Recorded prey includes lizards, frogs, small mammals and small birds. The supplied documents do not identify particular food plants or quantify prey selection.

Foraging habitat: Foraging structure

The habitat requirements assessment links the species with litter, rocks, rock crevices, logs, surface cover and ground-layer vegetation. The source also notes that it basks on rock slabs and in crevices.

  • Inspect litter, logs, rocks and low vegetation before clearing or moving machinery through habitat.
  • Retain connected ground vegetation between shelter features where possible, because the species requires some ground vegetation for movement.
  • Do not assume that apparently open ground is unsuitable if logs, rocks or other surface cover remain.

Foraging habitat: Foraging range

The supplied documents do not provide a home-range size, movement distance or quantified foraging range.

Breeding habitat: Breeding features

Breeding habitat is located in the ground layer rather than in trees or hollows. Available information identifies the physical cover used for breeding but does not provide a complete seasonal breeding schedule.

Breeding habitat includes litter, rocks, logs, surface cover and ground-layer vegetation in wet and dry sclerophyll forest, subtropical and dry rainforest and heath. Maintaining these features is therefore important around clearing boundaries and temporary work areas.

  • Avoid clearing or burning breeding habitat before a fauna spotter catcher has inspected the ground layer.
  • Retain logs, litter, rocks and low vegetation in connected patches where they do not conflict with an approved safety control.

Breeding habitat: Breeding biology

The supplied documents do not provide a confirmed mating period, birth period, litter size, gestation period, age at maturity or total lifespan for Southern Death Adders. The source material discusses viviparity within death adders, but the supplied extract does not provide species-specific values for these traits.

Breeding season: Not provided in the supplied documents.

Litter size: Not provided in the supplied documents.

Gestation: Not provided in the supplied documents.

Age at maturity: Not provided in the supplied documents.

Reproductive life span: 1 to 11 years, mean 5 years.

Total lifespan: Not provided in the supplied documents.

Sheltering habitat: Shelter features

Shelter is concentrated in the ground layer. Loss of litter, fallen timber, rocks or low vegetation can remove both refuge and ambush sites even where the broader vegetation community remains.

The species shelters in leaf litter, rocks, rock crevices, logs, surface cover and ground-layer vegetation. It also uses rock slabs and crevices for basking.

  • Retain logs, fallen timber, rocks, crevices, litter and ground-layer vegetation within retained habitat.
  • Check beneath and beside surface cover before moving logs, rocks, mulch or other stored material.
  • Keep temporary access routes and construction compounds out of mapped ground-cover habitat where practicable.

Sheltering habitat: Firewood and fire management

The forest practices review identifies firewood collection as a concern because death adders use leaf litter and ground cover for shelter. It also identifies inappropriate fire regimes or processes that remove leaf litter as possible contributors to decline.

  • Do not collect fallen timber from occupied or potential habitat unless authorised by the project environmental controls.
  • Plan hazard reduction or construction-related burning to retain suitable litter and surface cover, and inspect the area after fire before further disturbance.

Sheltering habitat: Dens and refuge dimensions

The supplied documents do not provide den dimensions, refuge dimensions, burrow dimensions or a required depth of litter.

Threats: Clearing and fragmentation

The main documented risks are loss of ground cover, unsuitable fire, removal of fallen timber and predation. Clearing projects can combine several of these impacts by removing shelter, breaking habitat continuity and increasing access for predators.

Clearing removes litter, logs, rocks, surface cover and ground vegetation used for breeding, feeding, shelter and dispersal. In the UNE and LNE assessment, clearing and dry areas were used to define unsuitable gaps between some species habitat areas, and dry or cleared areas were identified as barriers for a relictual reptile assessment that included the death adder program.

  • Avoid clearing validated-record buffers and retain connected ground-cover habitat around records.
  • Fence and mark exclusion areas before machinery arrives.
  • Use a fauna spotter catcher for staged clearing of suitable habitat, with particular attention to litter, logs, rocks and low vegetation.

Threats: Fire and firewood removal

Fuel management burning can have negative effects because death adders use leaf litter and ground cover for shelter. Firewood collection also removes important surface habitat. The reviewed forest practices report considered inappropriate fire regimes or removal of leaf litter possible contributors to decline.

  • Retain unburnt refuges and ground cover where fire is approved near suitable habitat.
  • Prevent informal collection of fallen timber from retained habitat.

Threats: Predators

The Southern CRA review identifies predation as the main cause of decline in western areas of that assessment region and recommends feral predator control. The supplied documents do not identify the predator species responsible for this death adder population.

  • Manage feral predators through an approved site or reserve program rather than ad hoc control.
  • Check baiting plans for non-target risks to reptiles.

Threats: Roads and hydrology

The supplied documents do not provide species-specific evidence about road mortality, disease or hydrology change for the Southern Death Adder. These risks should still be assessed where roads, drainage works or water diversion will remove or divide ground-cover habitat.

  • Record any snake mortality or live observations on roads and include them in the project fauna register.
  • Prevent sediment, drainage or construction water from degrading retained litter, logs, rocks and ground vegetation.

Survey methodology: 1. Targeted habitat inspection

Southern death adders use ground-level cover and occur in wet and dry sclerophyll forest, subtropical and dry rainforest, and heath. Surveys and pre-clearance checks should focus on litter, rocks, logs, surface cover and ground-layer vegetation, which also provide breeding, shelter and basking sites.

Inspect all proposed clearing areas and access routes systematically before disturbance.

Search leaf litter, rocks, rock crevices, logs, fallen timber, dense ground vegetation and other surface cover.

Include wet and dry sclerophyll forest, subtropical and dry rainforest, heath, rocky areas and sites with rock slabs or crevices.

Record the location and condition of habitat features, not only live animal observations.

Habitat search focus: Litter, rocks, rock crevices, logs, surface cover and ground-layer vegetation

Recorded breeding and shelter habitats: Wet and dry sclerophyll forest, subtropical and dry rainforest, heath, rocks, logs and surface cover

Known-record search area in the disturbance assessment: A 2 km radius buffer around validated records after 1970, where records are accurate to 1 km

  • Walk slowly through suitable habitat and inspect both exposed and concealed ground surfaces without unnecessarily moving cover.
  • Treat connected patches of ground vegetation and surface cover as potential movement habitat.
  • Use a qualified herpetologist or fauna spotter catcher where the site contains dense cover, rocks, logs or known records.

Survey methodology: 2. Nocturnal and seasonal searches

The supplied documents do not specify a validated number of nights, search hours, transect length or trapping effort for southern death adders.

Use targeted searches during suitable weather and seasonal conditions selected by the project ecologist, and document the conditions and effort used.

Repeat searches when the first inspection is affected by poor visibility, unsafe conditions or inaccessible cover.

  • Search likely shelter and basking sites during both daytime habitat inspections and carefully managed nocturnal searches.
  • Do not rely on one survey method, because the species may remain concealed beneath litter, rocks, logs and other surface cover.
  • Record survey dates, start and finish times, personnel, weather, search area, habitat searched, features inspected and detection method.

Survey methodology: 3. Records and detection precautions

Southern death adders are ambush-foraging snakes that use camouflage and ground cover, so absence during a visual search does not demonstrate absence from suitable habitat.

The species feeds on lizards, frogs, small mammals and small birds, and may occur from low to high elevation in suitable habitat.

Approach rocks, logs, litter and crevices slowly and keep hands and feet away from concealed spaces.

Feeding habitat: Lizards, frogs, small mammals and small birds

General habitat range: Low to high elevation

Basking sites: Rock slabs and crevices

  • Use appropriate snake detection and handling procedures, including a safe distance and suitable equipment under the project fauna management plan.
  • Photograph the animal from a safe distance where possible and record coordinates, habitat, behaviour and the feature where it was found.
  • Do not lift rocks, logs or other cover during a general survey unless the person doing so is authorised and the feature can be safely replaced.

Survey methodology: Minimum effort and reporting

  • Prepare a written survey design before work starts because the supplied documents do not provide a species-specific minimum number of nights, hours, trap nights, transect length or survey area.
  • Map all suitable habitat, validated records, survey coverage, detection results and areas that could not be searched safely.
  • Submit confirmed records and negative survey results, where required, to the relevant state wildlife database and provide records to the project environmental officer and the approving authority.
  • Report the survey method, dates, personnel, weather, effort, equipment, photographs, coordinates and habitat feature descriptions.

Before habitat disturbance: Avoid and minimise

Plan around the species’ dependence on intact ground cover. The main pre-clearance objective is to retain litter, logs, rocks, crevices, ground vegetation and connected habitat, while preventing avoidable removal or isolation of these features.

Redesign the work footprint to retain areas with deep litter, logs, rocks, rock crevices, surface cover and dense ground-layer vegetation.

Retain connected ground vegetation between retained habitat patches where practicable.

Avoid unnecessary removal of fallen timber and other surface cover because southern death adders use these features for shelter and breeding.

Protect rocky outcrops, cliffs, rock slabs and crevices from plant access, spoil placement and storage.

  • Set out no-go areas around retained habitat and keep machinery, materials, spoil and vehicles outside them.
  • Retain wet and dry sclerophyll forest, subtropical and dry rainforest, heath and other suitable habitat wherever the design allows.
  • Use the smallest practicable clearing footprint and stage clearing so that undisturbed refuge remains available during each work stage.

Before habitat disturbance: Approvals and work planning

Confirm the species’ current Commonwealth and state conservation status before works begin.

Check whether an EPBC Act referral, state approval, wildlife permit or authority to handle venomous snakes is required for the project and location.

Prepare a fauna management plan that identifies the spotter catcher, authorised handlers, exclusion areas, stop-work triggers, release sites, injury response and reporting process.

Plan vegetation clearing and ground disturbance outside periods identified by the project ecologist as presenting increased risk to snakes and their shelter sites.

  • Obtain written approval for any relocation, capture, handling or release activity before disturbance starts.
  • Include a site map showing retained habitat, access routes, release areas, exclusion fencing and emergency contacts.
  • Brief all workers that a southern death adder may be concealed under litter, logs, rocks or other surface cover.

Before habitat disturbance: Pre-clearance preparation

Complete a pre-clearance inspection immediately before disturbance, with timing set by the fauna management plan and any approval conditions.

Mark habitat features that must remain, including logs, rocks, rock crevices, litter-rich ground, dense ground vegetation and basking sites.

Install exclusion fencing only where it can be designed and maintained without trapping snakes or blocking movement into retained habitat.

Confirm that nearby retained habitat is suitable for any approved relocation and is not within the active machinery area.

  • Remove waste, stored materials and unnecessary machinery from retained habitat before clearing begins.
  • Check exclusion fencing, gates and access points each day before machinery enters the work area.
  • Brief operators on the location of no-go areas and the procedure for stopping when an animal or habitat feature is found.

During habitat disturbance: Daily controls and machinery coordination

Southern death adders can be concealed in the ground layer. Clearing must proceed slowly, with a fauna spotter catcher able to inspect cover and direct machinery away from retained habitat.

Complete a daily pre-start inspection of the work area, retained habitat, exclusion fencing and access points.

Keep a suitably qualified fauna spotter catcher present during clearing or ground disturbance in potential habitat, as required by the fauna management plan and approvals.

Use staged, slow clearing that allows the spotter catcher to inspect the ground ahead of machinery.

Stop machinery immediately when the spotter catcher gives the stop signal.

  • Maintain a clear communication method between the spotter catcher, machine operator, supervisor and environmental officer.
  • Keep workers and machinery outside marked no-go areas unless the environmental officer has authorised access.
  • Do not allow workers to put hands into litter, logs, rock crevices, holes or dense ground cover.

During habitat disturbance: Habitat features and animal finds

Treat logs, rocks, litter, rock slabs, crevices and dense ground vegetation as potential shelter or breeding habitat.

Do not move or destroy these features until they have been inspected by the fauna spotter catcher and the approved clearing sequence allows it.

If a southern death adder is found, stop work in the immediate area and keep people and machinery at a safe distance.

Only an appropriately authorised and experienced person should capture or handle the snake.

  • Do not attempt to catch, restrain, injure or kill the animal unless an authorised handler is acting under the approved fauna management plan.
  • Allow the authorised handler to determine whether the animal can be left in place or relocated to nearby retained habitat under the relevant approval.
  • Use a release site with suitable litter, rocks, logs, surface cover and ground vegetation, and record the release location.
  • Keep the animal’s handling time as short as practicable and avoid unnecessary disturbance.

During habitat disturbance: Stop-work and incident response

Stop work if a southern death adder is found in the active clearing area, if the spotter catcher cannot safely inspect the work face, or if machinery enters a marked exclusion area.

Stop work if clearing exposes an unplanned concentration of litter, logs, rocks, crevices or dense ground cover that has not been assessed.

Arrange prompt veterinary or wildlife carer assessment for an injured animal through the approved fauna management plan.

Record every sighting, capture, relocation, injury, mortality, stop-work event and breach of an exclusion control.

  • Photograph the animal or habitat feature where safe and record coordinates, date, time, habitat, action taken and the names of authorised personnel.
  • Notify the project environmental officer and relevant authority when required by approval conditions.
  • Review the clearing method before restarting and add controls where the planned method caused avoidable exposure or risk.

After habitat disturbance: Post-clearance checks

Post-clearance work should confirm that retained habitat remains functional and that no animals or shelter features were missed. Continue controls until the site is stable and the project obligations are closed.

Inspect the cleared area, retained habitat edges, exclusion fencing and access routes after each clearing stage.

Check for injured or trapped snakes, disturbed litter, displaced rocks, damaged logs and gaps in fencing.

Complete a final fauna inspection before removing temporary controls or allowing unrestricted access to the work area.

  • Reinspect any area where clearing occurred near rocks, logs, crevices, dense ground cover or litter-rich habitat.
  • Do not leave trenches, pits, pipes or other excavations open without escape measures or daily fauna checks under the fauna management plan.
  • Repair damaged exclusion fencing and remove materials that could trap animals.

After habitat disturbance: Monitoring and reporting

Monitor retained habitat and restored ground cover at the frequency and duration set by the project approval or fauna management plan.

Use repeat observations and habitat checks to identify loss of litter, logs, rocks, ground vegetation or connectivity after construction.

Report outcomes to the project environmental officer, including survey effort, animal records, relocations, injuries, mortality, retained habitat and corrective actions.

  • Update the relevant state wildlife database with confirmed records where required.
  • Retain photographs, coordinates, field sheets, permits, release records and incident reports in the project environmental record.
  • Investigate any death adder mortality and implement additional controls before similar work continues.

After habitat disturbance: Offsets and residual impacts

Assess residual impacts on suitable southern death adder habitat against the project approval and applicable state requirements.

Use an approved offset or other compensatory measure where required after avoidance and minimisation have been applied.

Ensure any offset or conservation action protects the habitat features used by the species, rather than only counting vegetation area.

  • Document why impacts could not be avoided and how the retained and protected habitat will be managed.
  • Include litter, logs, rocks, crevices, surface cover, ground vegetation and connectivity in the residual-impact assessment.
  • Do not treat relocation alone as compensation for permanent habitat loss.

Rehabilitation actions: Rebuild ground habitat

Rehabilitation should rebuild the ground structure used by southern death adders for breeding, shelter, movement and basking. It should also reduce the risks associated with inappropriate fire, removal of leaf litter and predation.

Retain or reinstate leaf litter, logs, rocks, rock slabs, rock crevices and other surface cover in suitable areas.

Re-establish continuous ground-layer vegetation to support movement through rehabilitated areas.

Use local native plant communities suited to the original wet or dry sclerophyll forest, subtropical or dry rainforest, or heath vegetation type.

Place reinstated logs and rocks so they provide stable cover without creating unsafe traps for fauna or workers.

  • Do not remove fallen timber from rehabilitation areas unless it presents a documented safety or access risk.
  • Protect rehabilitated ground cover from vehicle traffic, storage, grazing and unnecessary slashing.
  • Connect rehabilitation areas with retained ground vegetation where practicable.

Rehabilitation actions: Fire, predators and weeds

Prepare a fire management approach that retains leaf litter and ground cover while meeting lawful fuel-management requirements.

Avoid fire regimes or construction practices that remove the litter layer across retained or rehabilitated habitat.

Control weeds where they displace native ground-layer vegetation or reduce the quality of shelter.

Assess feral predator controls for benefits and non-target risks before implementation.

  • Use an approved ecological burn plan where fire is proposed, including protection of litter, logs, rocks and refuge areas.
  • Inspect rehabilitation after fire, weed treatment and major storm events for loss of ground cover or exposed shelter features.
  • Coordinate predator and weed control with the land manager and the project fauna management plan.

Rehabilitation actions: Monitoring and success measures

Monitor rehabilitation for survival and cover of native ground-layer vegetation, retention of leaf litter, logs and rocks, and continued connectivity with retained habitat.

Use repeat habitat inspections and targeted fauna surveys designed by the project ecologist to assess whether the restored area is being used.

Set measurable success criteria in the rehabilitation plan, including the area restored, ground-cover condition, survival of plantings, condition of habitat features and absence of new barriers.

  • Record the date, method, personnel, weather, area inspected, habitat condition and any southern death adder observations.
  • Repair erosion, fencing failures, weed invasion, loss of logs or rocks and other failures before they expand.
  • Continue monitoring until the approved success criteria are met and responsibility for ongoing management is formally transferred.

Sources