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White-browed Treecreeper (Climacteris affinis)

The White-browed Treecreeper is a small, mostly sedentary bark-foraging bird of arid and semi-arid woodlands and shrublands in southern Australia. It is listed as Endangered in Victoria and can be affected by clearing of mature woodland, loss of tree hollows, habitat fragmentation and disturbance during the breeding season.

Conservation status

Victoria, Flora and Fauna Guarantee Act 1988: Endangered.

Breeding season

The species is largely sedentary, with breeding timing varying across its range. The season below represents the documented pattern for western and eastern populations and should be adjusted if local records show different timing.

Months are January to December. Timing varies geographically, with breeding starting earlier in western areas than in eastern areas.

  • Breeding: Breeding can start in July in western areas and August in eastern areas, continuing to November. Eggs are laid in tree hollows.
  • Young: Incubation lasts 17 to 18 days and fledglings may remain dependent for up to 37 days. Timing of fledging therefore extends into late spring and, for later nests, early summer.
  • Movement and dispersal: The species is basically sedentary after post-fledging dispersal. Dispersal is expected after young become independent, but a specific month or distance is not provided.
  • Highest clearing risk: Clearing is most likely to harm the species from July to December because breeding, nesting, dependent young and use of tree hollows overlap during this period. Avoid removing active nest trees at any time.

Identification

The White-browed Treecreeper is a small brown, grey, black and white treecreeper that is usually detected while climbing trunks and branches. It may forage alone, in pairs or in small groups.

Adults are about 14 to 16 cm long, with a wingspan of about 22 cm and a mass of about 21 g.

The male is dark grey above, with a contrasting brown mantle and scapulars. The face has black lores, a narrow white tapered eyebrow and black and white streaking on the ear-coverts. The breast, belly, flanks and vent are boldly streaked black and white. The tail has a black sub-terminal band.

The female is similar, but has a rufous line along the upper edge of the eyebrow and rufous-tinged streaking on the upper breast. Juveniles are paler and have less distinct facial markings.

Identification: Similar species

The Brown Treecreeper is the main potential confusion species in the source material. The White-browed Treecreeper has a more distinctive white eyebrow, stronger facial patterning and bold black and white underpart streaking.

The Brown Treecreeper has duller breast streaks and more restricted streaking on the ear-coverts. Calls are also different.

Identification: Field signs and detection

The species climbs vertically on trunks and branches using an inching movement while probing bark for prey. It also forages on fallen logs, in leaf litter, among debris and on bare ground.

The call is described as a long, insect-like 'prrrpt'. This differs from the short, shrill 'peep' of the Brown Treecreeper.

Breeding evidence includes shallow saucer-shaped nests in tree hollows, lined with soft material. No diagnostic tracks, scats, sloughs or eyeshine characteristics are provided in the source material.

  • Search trunks, large branches, fallen logs and leaf litter for the bird's characteristic climbing and probing behaviour.
  • Record the direction and location of calling birds, particularly repeated calls from the same woodland patch.
  • Inspect suitable tree hollows only where authorised and where inspection will not disturb an active nest.

Distribution: States and bioregions

The White-browed Treecreeper occurs in arid and semi-arid southern Australia. The available material identifies eastern and western subspecies separated by Spencer Gulf and records the species from South Australia, Victoria and parts of New South Wales.

The species is associated with the Eastern Mallee bird community, which extends across mallee country from the Eyre Peninsula through the Murray Darling Depression and into north-western Victoria.

Records and conservation information identify South Australia, Victoria and New South Wales within the species' range. The species is listed as Rare in South Australia and Threatened in Victoria in the cited conservation material.

The eastern subspecies, Climacteris affinis affinis, occurs east of Spencer Gulf. The western subspecies, Climacteris affinis superciliosus, occurs west of Spencer Gulf.

Distribution: Strongholds and isolated populations

Important habitat occurs in larger, intact mallee remnants, including the Eastern Mallee region and associated conservation areas. The species is an associated component of the Eastern Mallee bird community rather than a species classified as strongly mallee-dependent by the cited BirdLife metric.

A documented south-eastern New South Wales population occurs between the Murrumbidgee and Lachlan rivers, including the Carrathool local government area south of the Lachlan River and the Griffith local government area. Binya State Forest was the only site where the population had been recorded since 1990 in the cited determination.

Distribution: Population and trend

A reliable national population estimate is not provided. The cited New South Wales determination estimated 20 pairs or fewer in the Carrathool and Griffith population at the time of assessment.

Bird reporting rates declined in the Eastern Mallee comparison between 2000 to 2004 and 2015 to 2019. In the more recent 2010 to 2014 versus 2015 to 2019 comparison, the species increased in the Western Mallee and was not recorded in some other reporting regions. These data are regional reporting-rate comparisons, not a national population estimate.

Documented local population: 20 pairs or fewer in the Carrathool and Griffith population, based on the New South Wales determination

Longer-term reporting trend: Decline in the Eastern Mallee comparison between 2000 to 2004 and 2015 to 2019

Australian conservation status in the supplied material: Not listed under the EPBC Act; Rare in South Australia and Threatened in Victoria

Habitat: Vegetation communities

The species uses dry woodland and shrubland with trees that provide rough bark, branches, fallen timber and hollows. Occupied sites can have either open or dense understorey and may have grassy, shrubby, sparsely vegetated or bare ground.

Known habitats include arid and semi-arid woodlands and shrublands dominated by acacias, sheoaks or native pines.

Recorded or described dominant plants include mulga Acacia aneura, gidgee Acacia cambagei, buloke Allocasuarina luehmanni, belah Casuarina cristata, black oak or related Casuarina vegetation including Casuarina pauper, and Callitris species.

Within southern mallee country, the species occurs in the Eastern Mallee bird community and in woodland habitats associated with the Murray Darling Depression.

Habitat: Structure and condition

Suitable sites retain mature trees, standing trunks, rough-barked stems, fallen logs and tree hollows. The understorey can range from open grass or sparse ground cover to dense low or tall shrubs.

The New South Wales determination reported that remaining habitat in the Carrathool and Griffith area was mostly in small fragments on farms, roadsides, travelling stock routes and parts of state forests.

Large connected remnants are more likely to support permanent territories and local movement than isolated small patches. The species is a poor disperser across fragmented areas.

Habitat: Climate and elevation

The documented climatic setting is arid to semi-arid southern Australia. The supplied documents do not give an elevation limit or a reliable elevation range.

Climate: Arid and semi-arid

Elevation limit: Not specified in the supplied documents

Foraging habitat: Diet and feeding sites

The White-browed Treecreeper is a bark forager that takes terrestrial and arboreal invertebrates from several microhabitats. Ants are a major part of the recorded diet.

The diet consists mainly of insects and other invertebrates, particularly ants.

Birds forage on tree trunks and limbs, fallen logs, leaf litter, debris and bare ground. They climb vertically and use an inching movement to extract prey from bark and nearby ground surfaces.

The Eastern Mallee conservation advice assigns the species to the bark forager guild.

  • Retain rough-barked live trees and standing dead trees where safe to do so.
  • Retain fallen logs, coarse woody debris and patches of leaf litter during clearing and site preparation.
  • Avoid treating all bare ground as non-habitat, because the species also searches bare ground and sparsely vegetated areas for prey.

Foraging habitat: Foraging range

Pairs or small groups defend permanent territories. An average territory size of 8.4 hectares has been reported in some regions.

The species is basically sedentary after post-fledging dispersal, so the removal of trees, logs or ground foraging areas within a territory can affect resident birds directly.

Reported average territory: 8.4 hectares in some regions

Movement pattern: Basically sedentary after post-fledging dispersal

Breeding habitat: Breeding biology

Breeding occurs in tree hollows within permanent territories. Pairs may breed alone or as cooperative groups, with helpers contributing to most nesting activities.

Breeding may begin in July in western parts of the range and in August in eastern areas, continuing to November.

Nests are shallow saucers placed in tree hollows and lined with soft material. Females lay speckled eggs. Cooperative helpers may assist with nesting activities, but not incubation or brooding.

The supplied documents do not provide a confirmed age at maturity or lifespan.

Breeding season: July to November, starting as early as July in western areas and August in eastern areas

Clutch size: 1 to 3 eggs

Incubation: 17 to 18 days

Post-fledging dependence: Up to 37 days

Age at maturity: Not provided in the supplied documents

Lifespan: Not provided in the supplied documents

Breeding habitat: Breeding habitat requirements

Breeding habitat requires suitable tree hollows within woodland or shrubland territories. Mature trees and standing dead trees should be retained where possible because hollow availability is a direct breeding requirement.

Breeding sites may occur in open or dense understorey. The surrounding territory also needs access to trunks, branches, fallen timber, leaf litter and ground surfaces for feeding.

Construction activity near active hollows should be managed to prevent direct disturbance, entry blockage and removal of the nest tree.

  • Before clearing, inspect mature and dead trees for hollows and signs of current use by treecreepers or other hollow-dependent fauna.
  • Do not remove a tree containing an active nest unless authorised under the relevant approval and an approved fauna management procedure is in place.
  • Retain a connected group of mature trees and nearby fallen timber rather than isolated nest trees wherever the design allows.

Sheltering habitat: Hollows and trees

The main documented shelter and nesting feature is a tree hollow. Permanent territories also rely on standing trees, dense or open understorey and ground debris that provide cover and feeding opportunities.

The species nests in shallow saucer-shaped nests placed in tree hollows. The supplied documents do not give a minimum hollow entrance size, hollow depth, tree diameter or preferred tree height.

Mature trees, standing dead trees and hollow-bearing trees should be retained because the species is a permanent-territory woodland bird and suitable hollows may be limited in fragmented remnants.

  • Map hollow-bearing live and dead trees before clearing.
  • Retain hollow-bearing trees and protect their trunks, root zones and access routes from machinery impacts.
  • Where a hollow tree must be removed under an approved action, follow the project fauna handling and replacement-hollow requirements.

Sheltering habitat: Ground and understorey cover

Occupied habitats may have open grassy ground, dense low to tall shrubs or little understorey. Fallen logs, leaf litter, debris and bare ground are used for foraging and may provide cover between trees.

No den, burrow, roost or refuge dimensions are provided in the supplied documents.

  • Retain fallen logs, leaf litter and patches of native understorey around retained trees.
  • Avoid unnecessary removal of ground debris during access-track construction and site compound establishment.
  • Keep retained woodland patches linked where possible because the species is a poor disperser across fragmented areas.

Threats: Clearing and fragmentation

The main project risks are removal and fragmentation of woodland, loss of mature and hollow-bearing trees, degradation of ground foraging habitat and disturbance during breeding. The species is also vulnerable where small isolated populations have limited recolonisation opportunities.

Clearing of acacia, sheoak, Casuarina, Callitris or mallee woodland removes foraging substrates, territory cover and tree hollows.

The Carrathool and Griffith population lost more than 90 percent of suitable habitat in the area described by the New South Wales determination. Remaining habitat was mostly in small fragments on farms, roadsides, travelling stock routes and parts of state forests.

White-browed Treecreepers are poor dispersers across fragmented areas. Isolated clearing can therefore reduce movement between groups and increase the risk of local loss.

  • Avoid clearing mature woodland and hollow-bearing trees, especially where several suitable trees occur within one territory.
  • Keep retained patches connected through native vegetation wherever practicable.
  • Treat roadside, travelling stock route and small farm remnants as potential habitat rather than assuming that only large reserves are occupied.

Threats: Fire and ground disturbance

The supplied documents do not identify a species-specific fire interval or fire response. Fire that removes mature trees, hollows, fallen logs, leaf litter or native understorey can reduce the features used for nesting and foraging.

Earthworks, grading, slashing and repeated vehicle access can remove or disturb the logs, litter and bare-ground feeding sites used by the species.

  • Plan fuel reduction and construction clearing to retain hollow-bearing trees, standing dead trees and fallen timber where safe.
  • Limit machinery access within retained woodland and avoid unnecessary removal of litter and coarse woody debris.
  • Inspect proposed burn areas and access routes for occupied habitat before works.

Threats: Roads, construction and disturbance

Road construction and widening can remove narrow woodland remnants and increase isolation between habitat patches.

Noise, vibration, lighting and machinery near a nest hollow may disrupt breeding, particularly from July to November. The documents do not provide a species-specific road-kill rate or traffic threshold.

  • Schedule vegetation removal outside the main breeding period where practicable.
  • Use pre-clearance surveys and fauna spotter catcher supervision where hollow-bearing trees or occupied woodland are present.
  • Record and protect active nests, calling territories and groups of trees with repeated detections.

Threats: Predators, disease and hydrology

The supplied documents do not identify a specific predator, disease or hydrology change as a confirmed major threat to this species.

Changes to water availability may alter dry woodland condition and prey resources, but species-specific hydrology effects are not described in the supplied material.

  • Do not infer absence from a quiet survey, because the species can occur at low density in isolated woodland remnants.
  • Manage waste, food scraps and artificial shelter around work areas to avoid attracting introduced predators and pest animals.
  • Report injured or dead birds and unusual disease signs through the project fauna management system and relevant wildlife authorities.

Survey methodology: 1. Diurnal area searches

Survey this species as a sedentary bark and ground-foraging woodland bird. Use targeted diurnal searches, call playback only where approved and appropriate, and habitat assessment because detection can be difficult in fragmented mallee and dry woodland.

Search suitable woodland and shrubland during daylight, concentrating on tree trunks, limbs, fallen logs, leaf litter and bare ground. The species forages alone or in groups and may occur as pairs or small groups within permanent territories.

Use a 2 hectare, 20 minute systematic search as a minimum standardised unit, supplemented by a 500 metre area search where the project area and access allow. These methods are used for mallee bird surveys in the Eastern Mallee data set.

Search in fine weather with limited wind and avoid heavy rain or extreme heat. Record all visual and aural detections, the number of birds, behaviour, breeding activity and the habitat used.

Inspect both retained trees and the ground beneath them. Record bark foraging, use of fallen timber, feeding in litter and movement between habitat patches.

Typical size: 14 to 16 cm long, with a wingspan of about 22 cm and weight of about 21 g.

Foraging niche: Bark and ground forager that takes ants and other invertebrates from bark, fallen logs, leaf litter, debris and bare ground.

Survey methodology: 2. Territory and habitat searches

Walk the full area proposed for clearing and all adjacent retained habitat that may be used by birds displaced by the works. Map records at the point of detection and identify likely territory centres.

Give priority to arid and semi-arid shrublands and low woodlands dominated by acacias, buloke, belah, sheoaks or native pines. Understorey may be open and grassy, shrub dominated, or sparse with bare ground.

Search mature trees, dead trees, fallen logs and litter around trees for foraging signs and repeated bird activity. Record habitat continuity, isolated remnants, roadside vegetation, travelling stock routes and nearby retained woodland.

Reported territory size: An average of 8.4 hectares has been reported in some regions.

Breeding period: Breeding may start in July in the west and August in the east, continuing until November.

Survey methodology: 3. Breeding and call detection

During July to November, listen for the species' long insect-like 'prrrpt' call and watch for pairs, groups, nest material, repeated visits to hollows and fledglings. The short shrill call of the Brown Treecreeper is different and should not be treated as confirmation.

Inspect potential nest trees from the ground without climbing or opening hollows. Record hollow entrances, tree species, tree condition and any repeated use by adults.

Use call playback only under the relevant state fauna survey authority, approval and animal ethics requirements. Do not use playback where it could disrupt breeding, increase exposure to predators or cause repeated disturbance.

Survey methodology: Minimum effort and reporting

  • Cover all suitable habitat within the disturbance footprint and nearby retained habitat that could support displaced birds.
  • Use repeated visits where the first survey is negative but suitable habitat is present, because the species can be inconspicuous and may occur in small groups or isolated remnants.
  • Record survey dates, start and finish times, weather, wind, rainfall, observer names, search area, method, effort, habitat condition, GPS locations, photographs and detection behaviour.
  • Report the species' presence, absence and habitat observations to the relevant state wildlife database and include the record in the project environmental report.
  • Check current state survey, animal ethics, handling and wildlife rehabilitation requirements before starting field work.

Before habitat disturbance: Avoid and minimise

Treat suitable woodland and shrubland as potential habitat even when birds are not detected. The species is sedentary, uses permanent territories and is a poor disperser across fragmented vegetation, so clearing can remove both birds and the habitat needed to support them.

  • Retain connected stands of acacia, buloke, belah, sheoak and Callitris woodland, including mature and dead trees, fallen timber, leaf litter and areas of bare ground used for foraging.
  • Avoid clearing occupied territories and retain habitat around records, rather than retaining isolated trees or narrow strips only where a connected patch can be retained.
  • Keep retained woodland connected to nearby remnants, roadside vegetation, travelling stock routes and other habitat that may permit movement between territories.
  • Locate access tracks, laydown areas, compounds and services in already cleared or highly modified areas where practicable.

Before habitat disturbance: Approvals and work planning

  • Confirm the current EPBC Act status before works begin. The supplied Eastern Mallee advice lists the White-browed Treecreeper as not nationally listed, but approval requirements can change and state or local requirements may still apply.
  • Obtain the relevant state permits and approvals for clearing, fauna survey, capture, handling, relocation and rehabilitation, particularly in Victoria where the species is listed as Endangered in the supplied project information.
  • Schedule clearing outside the July to November breeding period where practicable, and avoid active nests, dependent fledglings and occupied territories whenever they are identified.
  • Prepare a fauna management plan that maps records and habitat, defines exclusion areas, nominates authorised fauna handlers, sets stop-work triggers and provides contacts for wildlife carers and veterinary services.

Before habitat disturbance: Site preparation

  • Complete a pre-clearance survey immediately before works, with particular attention to mature trees, dead trees, hollows, fallen logs, litter and bare ground.
  • Mark retained habitat, no-go areas, nest trees, hollow-bearing trees, logs and access limits on plans and in the field before machinery arrives.
  • Install and maintain exclusion fencing where it can prevent machinery or workers entering retained habitat, and brief all operators on the fencing, exclusion areas and stop-work procedure.
  • Stage clearing from the least suitable habitat towards retained habitat only where the fauna management plan supports that approach and an authorised spotter catcher is present.

During habitat disturbance: Daily controls

Keep a fauna spotter catcher involved throughout clearing in or beside suitable habitat. Use slow, controlled works so birds can leave voluntarily and so hollows, logs and other habitat features can be checked before they are moved or destroyed.

  • Inspect exclusion fencing, marked habitat and work limits at the start of each shift and after storms, vehicle movements or repairs.
  • Maintain a trained, authorised fauna spotter catcher within the active clearing area and in direct communication with machinery operators.
  • Clear progressively and use low-speed machinery near retained trees, dead timber, logs and shrub cover so the spotter catcher can inspect each area before disturbance.
  • Stop machinery before felling, pushing, mulching or moving any tree, log or other feature that the spotter catcher identifies as potentially occupied.

During habitat disturbance: Fauna handling and habitat features

  • Allow a White-browed Treecreeper to leave voluntarily where safe, and do not chase it through dense vegetation or expose it unnecessarily to heat, predators or traffic.
  • Only an appropriately authorised person may capture, handle or relocate the bird, and handling must follow the relevant state permit, animal welfare and project procedures.
  • If relocation is approved, place the bird in nearby retained habitat that matches the species' woodland or shrubland habitat and is outside the active work area, rather than moving it long distances.
  • Inspect hollow-bearing trees before felling and apply the approved hollow-tree procedure, including any staged felling, lowering or inspection requirements.
  • Retain or carefully relocate suitable fallen logs and leaf litter where approved, because the species forages on bark, fallen timber and the ground surface.
  • Do not remove a nest, eggs or dependent young unless the relevant wildlife authority has approved the action and an authorised person is directing it.

During habitat disturbance: Incidents, stop-work and records

  • Stop work immediately if a White-browed Treecreeper is found within the active clearing area, if an active nest or dependent young is identified, or if an animal is injured or trapped.
  • Keep machinery, vehicles and personnel clear until the spotter catcher has assessed the bird, confirmed a safe course of action and released the area for work.
  • Place an injured bird in a suitable ventilated container only if authorised and trained to do so, minimise handling and transport it promptly to a veterinarian or wildlife carer.
  • Record every observation, capture, relocation, injury, mortality, nest, hollow and stop-work event with the date, time, location, habitat, action taken and outcome.
  • Notify the project environmental officer and the relevant wildlife authority when required by the permit, management plan or state reporting system.

After habitat disturbance: Post-clearance checks

The end of machinery activity is not the end of fauna risk. Confirm that retained habitat is intact, check for injured or trapped birds and keep controls in place while displaced birds settle into retained woodland.

  • Complete a walked inspection of the cleared area and the edge of retained habitat for injured, dead or trapped birds, damaged nests, unstable trees and displaced fauna.
  • Check retained hollow-bearing trees, logs, leaf litter, shrub cover and access controls after clearing and after any follow-up earthworks.
  • Confirm that no machinery, spoil, mulch or fencing has encroached into mapped retained habitat or blocked movement between retained patches.

After habitat disturbance: Monitoring and reporting

  • Repeat targeted diurnal searches in retained habitat during the next suitable survey period, with additional checks during July to November where works overlapped the breeding period.
  • Compare post-work records with pre-clearance records, including bird numbers, behaviour, territory use, habitat condition and any breeding evidence.
  • Maintain exclusion fencing, no-go markers and fauna controls until the environmental officer confirms that construction risk has ended.
  • Report clearing impacts, fauna incidents, relocations, injuries, mortalities, rehabilitation actions and monitoring results to the project regulator and relevant state wildlife database where required.

After habitat disturbance: Offsets and corrective action

  • Check whether residual impacts require an offset, restoration commitment or other approval condition under the applicable state or local legislation.
  • Replace damaged habitat features where approved and repair failed fencing, erosion controls, revegetation areas or access restrictions promptly.
  • Escalate unexpected loss of occupied habitat, repeated mortality or failure of retained habitat to the project environmental officer and regulator.

Rehabilitation actions: Rebuild suitable habitat

Rehabilitation should recreate the dry woodland structure used for feeding, shelter and nesting. It should provide connected habitat with mature and dead trees over time, while protecting the ground layer used by this species.

  • Plant locally appropriate acacia, buloke, belah, sheoak and Callitris species that match the pre-clearing vegetation community and local provenance requirements.
  • Create connected revegetation areas rather than isolated plantings, and link them with retained woodland, roadside vegetation or other suitable remnants where practicable.
  • Retain existing mature trees and dead trees, protect natural regeneration and allow age cohorts to develop instead of creating a single-aged stand.
  • Reinstate suitable fallen logs, bark, leaf litter and patches of bare ground where these features were removed and reinstatement is safe and approved.

Rehabilitation actions: Hollows, predators and fire

  • Protect existing hollow-bearing trees and retain replacement trees for future hollow development.
  • Use nest boxes only where a species-specific need has been established, the design is approved by the relevant fauna specialist and boxes can be monitored and maintained.
  • Control weeds that alter the understorey, ground layer or regeneration of the target woodland community.
  • Manage introduced predators, domestic animals and other site-specific risks where they threaten birds using restored habitat.
  • Apply fire planning that protects retained woodland, mature and dead trees, fallen timber and regenerating understorey while meeting the site's lawful bushfire requirements.

Rehabilitation actions: Success measures

  • Monitor planted survival, natural regeneration, weed cover, ground litter, fallen timber, hollow retention, habitat connectivity and evidence of erosion or compaction.
  • Use repeat 2 hectare, 20 minute searches and 500 metre area searches where practicable so results can be compared with the survey approach used for Eastern Mallee birds.
  • Treat rehabilitation as successful only when the site supports the intended woodland structure and records show continued use by White-browed Treecreepers or other appropriate woodland birds over the monitoring period set by the approval.
  • Record the date, effort, weather, observers, bird detections, breeding evidence and habitat condition for every monitoring visit, and submit required records to the relevant state wildlife database.

Sources