Fauna Spotters logo

White-quilled Rock Pigeon (Petrophassa albipennis)

The White-quilled Rock Pigeon is an Australian pigeon restricted to sandstone cliffs, rocky escarpments, gorges and associated grassy woodland. It may be encountered on infrastructure sites where works affect rocky outcrops, ridgelines, sandstone shelters or nearby feeding areas, particularly in the Kimberley and northern Northern Territory.

Conservation status

Northern Territory, Territory Parks and Wildlife Conservation Act 1976: Near threatened.

Identification

This is a medium to large, dark brown pigeon of rocky country. It is most readily identified by the white wing panel, pale facial lines and its association with sandstone escarpments and gorges.

The plumage is mid-brown to reddish-brown, with white spots on the chin and forehead. Thin pale lines run from the bill around the eye and across the sides of the head. The orbital skin is grey. The white wing panel is usually conspicuous when the bird flies.

The bird often perches on a prominent rock or ledge with its body held horizontally, tail clear of the ground and wings drooping below the tail. Flight can include a loud clattering or whirring of the wings, followed by a glide from one rocky prominence to another.

Identification: Size and subspecies

Two subspecies are recognised. The nominate subspecies, P. a. albipennis, has larger white wing patches and occurs mainly in Western Australia. P. a. boothi occurs in the Northern Territory and has smaller white wing patches.

Length: About 30 cm.

Weight: 103 to 156 g.

Wing length: 122 to 145 mm.

Bill length: 11.0 to 14.5 mm.

Identification: Similar species and field signs

The Chestnut-quilled Rock Pigeon has a similar rocky habitat and general posture, but the White-quilled Rock Pigeon has white rather than chestnut wing panels. The supplied sources do not provide a diagnostic description of sex differences, tracks, scats, nests, eggs or other ground signs.

For detection, search rocky ridgelines, ledges and sandstone outcrops, and watch for low flights over ridges. Call playback may produce a response, but captured birds can become stressed quickly and should be handled only under appropriate authority and animal welfare procedures.

Distribution: States and regions

The White-quilled Rock Pigeon is endemic to northern Australia. The available sources describe a discontinuous range associated with sandstone country rather than a broad distribution across open habitats.

The species occurs in the Kimberley of Western Australia and in the Northern Territory east of the Victoria River. The Northern Territory range includes the upper Daly River catchment and the Victoria River area. The supplied Queensland species profile confirms the species in Queensland records, but does not specify the Queensland range or bioregions.

Western Australia: Kimberley, including the Wyndham area and sandstone escarpment country.

Northern Territory: North-western Northern Territory, east of the Victoria River, including the upper Daly River catchment and the Victoria River area.

Queensland: A Queensland Government species profile is available, but the supplied material does not provide a more precise Queensland distribution.

Bioregions: The supplied documents identify the Kimberley, Victoria River and upper Daly areas, but do not provide formal IBRA bioregion names.

Distribution: Strongholds and population status

Known strongholds in the supplied material are sandstone cliffs, towers, gorges and escarpments in the Kimberley and northern Northern Territory. No population estimate, abundance estimate or population trend is provided.

Population size: Not stated in the supplied documents.

Population trend: Not stated in the supplied documents.

International status: Least Concern is reported in the supplied species account.

State status: Near Threatened in the Northern Territory and Least Concern under the supplied Queensland profile.

Habitat: Rocky habitat

Habitat is centred on rocky sandstone formations, with nearby grassy woodland used for feeding. Rocky refuges and flight paths over ridges are important when assessing clearing or construction sites.

The species roosts on sandstone cliffs and towers and uses rocky escarpments, gorges, rocky outcrops, boulders, ledges and ridgelines. Birds move readily among rocks and return to escarpments when disturbed.

Sites with connected rocky features may be more useful than isolated rocks because the species flies low over ridges and uses rock ledges for movement and resting.

Habitat: Associated vegetation and climate

Birds feed in adjacent grassy woodlands, while the supplied habitat classification also identifies subtropical or tropical dry grassland. The sources do not provide a defined elevation limit, temperature limit, vegetation community list or minimum outcrop size.

Broad habitat types: Rocky escarpments, sandstone gorges, cliffs, towers, rocky outcrops and adjacent grassy woodland.

Structural features: Prominent rocks, ledges, ridgelines, boulders and flight paths over rocky country.

Elevation limit: Not stated in the supplied documents.

Climate limit: No numerical climate limit is stated; the described range is in tropical northern Australia.

Foraging habitat: Foraging areas and behaviour

The species feeds in grassy woodland adjoining rocky escarpments and returns to rock country when disturbed. The supplied documents do not identify particular food plants or give a measured foraging radius.

White-quilled Rock Pigeons feed in adjacent grassy woodlands and use rocky ground and outcrops. Birds may be seen walking among rocky outcrops, and they return to escarpments after disturbance.

During field capture work, birds were flushed while walking on escarpments and flew low over rocky ridges. These observations indicate that ridgelines and low flight paths should be retained and checked before works.

Diet: The supplied documents identify feeding in grassy woodland and on or among rocky ground, but do not specify food items.

Foraging range: Not measured in the supplied documents.

Typical feeding structure: Adjacent grassy woodland, open sandy areas near rocky outcrops and rocky ground.

Breeding habitat: Breeding information

The supplied documents do not provide breeding dates, clutch size, incubation, maturity or lifespan. Breeding habitat should therefore be assessed from the species' known rocky roosting and sheltering features, with targeted follow-up where works may disturb occupied sites.

No nest location, breeding season or breeding-site description is given in the supplied sources. Do not assume that an apparently unused ledge or gorge is unoccupied without an appropriate survey.

Breeding season: Not stated in the supplied documents.

Clutch size: Not stated in the supplied documents.

Incubation period: Not stated in the supplied documents.

Age at maturity: Not stated in the supplied documents.

Lifespan: Not stated in the supplied documents.

Breeding habitat: Features to check before works

Inspect sandstone cliffs, ledges, crevices, towers, gorges and sheltered rocky depressions before clearing, blasting, drilling or installing infrastructure. Retain adjacent grassy woodland and low flight paths where practicable because these areas are used with the rocky habitat.

The sources do not provide a nest size, nest height, ledge dimensions or buffer distance. Site-specific advice should be set by the project ecologist after survey and in consultation with the relevant wildlife authority where required.

Sheltering habitat: Roosts and refuges

Rocky escarpments are the main documented shelter and roosting habitat. The species uses cliffs, towers, ledges, boulders and other sandstone features rather than tree hollows or burrows.

The species roosts on sandstone cliffs and towers and rests on prominent rocks or ledges. It moves among rocks and returns to escarpments when startled.

The sources do not identify use of tree hollows, burrows, dens, caves of a particular size or ground-cover thresholds. Caves are included in one broad habitat classification, but no species-specific cave dimensions or roost requirements are given.

Documented shelter: Sandstone cliffs, towers, escarpments, gorges, rock ledges, boulders and outcrops.

Roost position: Prominent rocks and ledges, often with the body held horizontally and the tail clear of the ground.

Shelter dimensions: Not stated in the supplied documents.

Tree hollows and burrows: No use is documented in the supplied material.

Sheltering habitat: Construction checks

Before disturbance, inspect rocky ridgelines, ledges, crevices, towers and depressions for birds and repeated flight paths. Avoid trapping birds against rock faces or shelter features during clearing and construction, because the species is wary and appeared to become easily stressed during capture.

  • Schedule a pre-clearance inspection of rocky habitat and adjacent grassy woodland before works start.
  • Check low flight paths over ridges and gaps between rocky outcrops before placing exclusion fencing, nets, plant or temporary structures.
  • Stop work and obtain project-specific ecological advice if birds are repeatedly flushed from a rock shelter or ledge.

Threats: Clearing and construction

The supplied documents do not provide a formal threat assessment. For projects, the main foreseeable risks are direct loss or disturbance of sandstone habitat, obstruction of low flight paths and disturbance of adjacent feeding woodland.

Removal or modification of sandstone cliffs, towers, gorges, ledges, outcrops or ridgelines can remove roosting and movement habitat. Clearing adjacent grassy woodland can reduce feeding areas linked to the rocky habitat.

Blasting, drilling, quarrying, heavy vehicle movement and repeated human presence may disturb birds using prominent rocks, ledges and escarpments. The species is wary, and field capture observations indicate that it can become easily stressed.

  • Map rocky escarpments, outcrops, ridgelines, ledges and adjacent grassy woodland before finalising the works footprint.
  • Keep plant, laydown areas, access tracks and temporary structures away from rocky shelters and low flight paths where practicable.
  • Use a fauna spotter catcher or suitably qualified ecologist when birds are present in the disturbance area, and minimise handling time if rescue or relocation is authorised.

Threats: Other pressures

The supplied documents do not provide species-specific evidence about fragmentation, roads, fire, introduced predators, disease or hydrology change. These pressures should be considered at the site level where they alter rocky refuges, adjacent grassy woodland, access to food or movement between outcrops.

  • Assess whether new roads or tracks increase disturbance at regular roosts or feeding areas.
  • Check whether altered drainage, water availability or erosion affects rocky shelters and adjacent grassy woodland.
  • Include fire and predator risk in the site risk assessment where project activities change cover or access around escarpments.

Survey methodology: 1. Rocky escarpment searches

Survey rocky escarpments, sandstone cliffs, ridges, ledges and adjacent grassy woodland. White-quilled Rock-Pigeons are wary, may respond to call playback, and can fly low over rocky ridges, so combine quiet visual searches with targeted playback and, where authorised, specialist capture methods.

Search sandstone cliffs, towers, gorges, rocky outcrops, ridges and ledges during the early morning and late afternoon, when birds may be feeding or resting on prominent rocks.

Search adjacent grassy woodland because birds feed there but return to escarpments when startled.

Walk slowly and quietly, scanning prominent rocks, ledges and low flight paths for birds, clattering wingbeats and low flights between ridges.

Record the location of each bird, flock, flight path, feeding area, roosting ledge and likely escape route on project mapping.

Known habitat: Sandstone cliffs and towers, rocky escarpments and gorges, with adjacent grassy woodland

Reported body mass: 103 to 156 grams

Reported size: About 30 centimetres

Survey methodology: 2. Call playback and observation

Use species-specific call playback at suitable rocky escarpment sites, particularly where birds are flushed during a quiet search.

Remain concealed and observe the playback area, surrounding ridges and likely flight paths after playback begins.

Allow enough time for a response because the field study took almost 30 minutes to catch one bird after playback commenced, although the species appeared to respond quite reliably.

Record responses as no response, response without approaching, or approach within 5 metres of the playback device, using the response categories reported for the study.

Stop playback if birds show signs of stress, repeated alarm flights or sustained displacement from the site.

Study response: The species appeared to respond quite reliably to call playback

Study capture time: Almost 30 minutes elapsed before one bird was caught after playback commenced

Survey methodology: 3. Specialist capture, where approved

Use capture only where required for an approved survey or fauna management purpose and under the direction of an appropriately authorised bird ecologist or fauna spotter catcher.

The field study used a ground net set-up on rocky ridges surrounding a depression about 20 metres in diameter, with 12 to 18 metre nets, 210 denier netting and 30 millimetre mesh.

Treat this method as difficult to deploy on rock because guy ropes may be hard to secure in rock crevices.

Process captured birds promptly and carefully because the species appeared to become easily stressed during capture.

Do not rely on mist nets, playback or capture as a substitute for a pre-clearance search where the project can avoid disturbing the habitat.

Study ground-net length: 12 to 18 metres

Study net density: 210 denier

Study mesh: 30 millimetres

Study capture result: One bird was captured using the rocky-ridge ground-net set-up

Survey methodology: Minimum effort and reporting

  • Survey all rocky escarpments, sandstone outcrops, gorges, ledges, ridges and adjacent grassy woodland within and immediately beside the disturbance footprint.
  • Complete searches in the early morning and late afternoon, and include evening observations where birds use rocky ridges or are likely to fly low between outcrops.
  • Use call playback at suitable sites when the surveyor is authorised and has a species-specific stop rule for disturbance.
  • Map all records, roosting and feeding areas, flight paths, escape routes and habitat retained from disturbance.
  • Record survey date, start and finish time, weather, observers, area searched, playback locations, playback response, birds seen, disturbance and any limitations.
  • Submit confirmed records and survey results to the relevant state wildlife database and include the records in the project fauna report.

Before habitat disturbance: Avoid and minimise

Treat rocky escarpments, sandstone formations and connected feeding areas as the main habitat risk. The species is listed as Near Threatened in the Northern Territory, while the supplied Queensland profile lists it as Least Concern under the Queensland Nature Conservation Act 1992.

  • Retain sandstone cliffs, rocky towers, escarpments, gorges, ridges, ledges and boulder fields inside and beside the work area.
  • Retain adjacent grassy woodland used for feeding and keep flight routes between feeding areas and escarpments open.
  • Design the disturbance footprint around occupied roosting ledges, prominent resting rocks, low flight paths and repeatedly used access routes.
  • Avoid isolating retained rocky habitat from adjacent woodland where the project can retain or restore the intervening vegetation.

Before habitat disturbance: Approvals and planning

EPBC Act status supplied: Not listed

Northern Territory status supplied: Near Threatened

Queensland profile status supplied: Least concern under the Nature Conservation Act 1992

  • Check the current EPBC Act status before works because the supplied profile states that the species is not nationally listed, but a referral may still be required if the legal status or project impacts change.
  • Check state and territory wildlife legislation, permits and fauna handling requirements before using playback, nets, capture, handling or relocation.
  • Obtain project-specific advice for the Northern Territory because the species is listed there as Near Threatened.
  • Prepare a fauna management plan that identifies rocky habitat, feeding woodland, survey methods, stop-work triggers, authorised personnel, release sites, injury response and reporting requirements.
  • Stage clearing so that retained rocky habitat and connected feeding areas remain available while works proceed.

Before habitat disturbance: Pre-clearance preparation

  • Complete the species-specific pre-clearance survey before machinery enters rocky escarpments, sandstone outcrops, gorges or adjacent grassy woodland.
  • Mark no-go areas, occupied or likely roosting ledges, rocky escape routes, feeding areas and retained vegetation on the ground and on construction plans.
  • Use exclusion fencing or other clearly visible barriers where they can protect retained rocky habitat and stop machinery entering it.
  • Brief the fauna spotter catcher, supervisors and operators on the species' dark brown body, white wing patch, pale facial lines, loud clattering wingbeats and tendency to move along rocks.
  • Confirm the destination for injured birds with a veterinarian or wildlife carer before clearing starts.

During habitat disturbance: Daily controls and machinery interface

Keep a fauna spotter catcher involved whenever work can disturb rocky escarpments, sandstone outcrops, gorges or connected feeding woodland. Use a slow, observable work sequence so birds can leave without being trapped against machinery or isolated habitat.

  • Inspect exclusion fencing, no-go markers and retained habitat before work starts each day.
  • Brief operators on the day's work area, access routes, bird exclusion zones and the stop-work signal.
  • Keep the fauna spotter catcher ahead of machinery in rocky habitat and adjacent woodland, with a clear view of ledges, boulders, flight paths and escape routes.
  • Clear vegetation and rubble progressively, allowing the spotter catcher to inspect each section before machinery advances.
  • Stop machinery immediately when the spotter catcher signals a bird, injury, trapped animal, unsafe handling condition or an unapproved entry into retained habitat.
  • Do not chase birds across ridges, flush them repeatedly or use playback during active clearing unless the authorised fauna procedure specifically requires it.

During habitat disturbance: Habitat feature handling

  • Inspect sandstone outcrops, boulders, rock ledges, cliff bases, gorges and rubble piles before moving or removing them.
  • Retain rocks and ledges that provide roosting, resting or escape locations wherever the design allows.
  • Inspect nearby grassy woodland before clearing because birds feed there and return to escarpments when startled.
  • Do not move rocks or operate machinery beneath occupied or repeatedly used ledges until the fauna spotter catcher has cleared the area.
  • Treat any hollow-bearing tree, log, burrow or wet area encountered during clearing as a separate fauna management issue and follow the approved project procedure, because the supplied species records do not identify these features as characteristic habitat for this pigeon.

During habitat disturbance: Response, release and records

  • If a bird is found, stop the immediate activity, keep people and machinery back, and allow an unobstructed route to nearby retained rocky habitat where safe.
  • Only an appropriately authorised person may handle, capture or relocate the bird, and handling must be prompt and careful because the species appeared easily stressed in the field study.
  • Release a healthy bird only at a pre-approved nearby retained site with suitable rocky habitat and a connected route to adjacent woodland, unless the relevant authority directs otherwise.
  • Transfer an injured or compromised bird to the nominated veterinarian or wildlife carer and record the transfer.
  • Keep the bird in a quiet, secure container for the shortest practical time and follow the authorised fauna handling procedure.
  • Stop work and obtain advice if a bird cannot safely leave, is repeatedly flushed, is injured, is trapped by fencing or machinery, or is found in an unapproved work area.
  • Record every sighting, capture, handling event, injury, release, mortality, stop-work event, location, time, personnel and action taken.

After habitat disturbance: Post-clearance checks

Confirm that clearing has not removed or isolated the rocky habitat used by the species. Continue controls until disturbed areas are stable and retained habitat is protected from follow-on construction impacts.

  • Inspect the completed clearing area, retained escarpments, rock ledges, gorges and adjacent woodland for stranded, injured or trapped birds.
  • Check exclusion fencing and access controls after clearing and after major construction changes.
  • Confirm that rubble, stockpiles, temporary fencing and machinery have not blocked rocky flight paths or access to retained feeding areas.
  • Complete a final fauna record and reconcile all sightings, captures, releases, injuries and mortalities with the pre-clearance register.

After habitat disturbance: Monitoring and reporting

  • Monitor retained rocky habitat and connected grassy woodland using repeat early morning and late afternoon searches, with evening observations where the project risk assessment identifies a need.
  • Use the same observation points, mapped routes and playback protocol for repeat surveys so changes in detections can be compared.
  • Report unexpected occupancy, repeated displacement, injury, mortality or habitat loss to the project environmental officer and the relevant regulator or land manager.
  • Submit verified records to the relevant state wildlife database and retain maps, effort details, photographs and fauna handling records with the project environmental file.

After habitat disturbance: Maintain controls and offsets

  • Maintain no-go areas, exclusion fencing and access controls until the environmental officer confirms that construction risk has ended.
  • Repair damaged barriers promptly and prevent worker access to retained ledges, outcrops and adjacent feeding woodland.
  • If residual impacts cannot be avoided or minimised, assess offsets or other regulatory requirements using the current approval and the species' state status.

Rehabilitation actions: Restore habitat structure

Rehabilitation should restore the link between rocky shelter and nearby feeding woodland. The supplied documents identify rocky escarpments, sandstone cliffs, gorges, ledges and adjacent grassy woodland as the habitat features to retain or restore.

  • Reinstate stable rock piles, boulders, ledges and open rocky margins where their removal was temporary and the approved design can safely support them.
  • Restore native grassy woodland beside retained escarpments using locally appropriate native species selected for the site and region.
  • Keep restored rock features connected to retained cliffs, outcrops, ridges and gorges rather than creating isolated rock patches.
  • Do not plant over flight lines, rocky resting surfaces or access routes used by birds moving between woodland and escarpments.
  • Remove temporary materials and reshape disturbed ground so birds can move safely between rocky habitat and feeding areas.

Rehabilitation actions: Fire, weeds and predators

  • Prepare a site-specific fire management plan that protects rocky escarpment vegetation and the adjacent grassy woodland used for feeding.
  • Control weeds so restored grassy woodland does not lose its native ground cover or become blocked by dense invasive growth.
  • Manage domestic and introduced predators in accordance with the project approval and local land management requirements.
  • Avoid creating artificial food or water points that could concentrate birds or increase disturbance unless they are part of an approved ecological management program.

Rehabilitation actions: Monitoring and success measures

  • Inspect restored rocky features and adjacent woodland after establishment, after major rainfall and after any fire or erosion event.
  • Monitor whether the restored area remains connected to escarpments and whether rock ledges, open flight paths and feeding ground remain available.
  • Repeat early morning and late afternoon searches at the same mapped locations used before and during construction.
  • Use species detections, observed use of restored rocks or ledges, continued access to adjacent woodland and absence of project-related injury or mortality as project success measures.
  • Document monitoring effort, weather, observers, detections, habitat condition, weed cover, erosion, predator signs and corrective actions.

Sources