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Australian Swiftlet (Aerodramus terraereginae)

The Australian Swiftlet is a small, plain greyish insect-eating swiftlet that breeds and roosts mainly in dark caves and rocky shelter in Queensland. Colonies can be dense and concentrated, so cave works, blasting, access, lighting, construction noise and changes to water flow need careful planning. The species is listed as least concern and is not listed as threatened in Australia, but in Queensland it is a colonial breeder, so tampering with a breeding place requires a high risk species management program under the Nature Conservation (Animals) Regulation 2020.

Conservation status

Queensland, Nature Conservation Act 1992: Colonial breeder. Least concern in Queensland, but it breeds in colonies, so tampering with a breeding place needs a high risk species management program rather than the low risk program.

Breeding season

Australian Swiftlets are resident colonial breeders. Documented breeding timing is strongest for island colonies, where breeding extends from July to April and egg laying peaks from November to February. Timing in mainland Queensland colonies is less well defined and can vary between sites and years.

Breeding mode: Colonial breeding in caves, including sea caves, boulder-roofed caves and inland limestone caves. Nests are usually on smooth, overhanging rock surfaces in dark cave zones.

Clutch size: One egg per clutch. Up to three sequential clutches may be laid in one breeding season.

Incubation: Not recorded. A nearly fledged older sibling may incubate a later egg.

Fledging: Not recorded. Nestlings may leave when adults or older fledglings depart from nearby nests.

Age at maturity: Not recorded.

Breeding frequency: Up to three sequential clutches have been recorded in a season at a Dunk Island colony.

Timing varies between island and mainland colonies and between years, with cyclone impacts and local conditions contributing to changes in colony size and breeding activity.

  • Breeding and nesting, island colonies: Breeding extends from July to April, with peak egg laying from November to February.
  • Eggs, nestlings and dependent young, island colonies: Nests may contain an egg, nestling or later sequential clutch during the extended breeding season.
  • Colony occupancy and night roosting: Resident birds use caves and other sheltered sites for colony roosting, and adults sleep on nests in dark cave zones.
  • Daylight aerial foraging: Australian Swiftlets forage on the wing during daylight and feed mainly on insects.
  • Highest clearing risk: Avoid cave entry, vibration, lighting changes and other works near active colonies from July to April, with the greatest risk from November to February when eggs and dependent young are most likely.

Identification: Appearance

Australian Swiftlets are usually seen in flight and can be difficult to identify from a quick observation. Look for their plain grey appearance, pale rump and rapid wing beats, then confirm the location and behaviour where possible.

This is a small, plain greyish swiftlet. It has a pale rump, a slightly darker cap and slender wings.

The flight is fast and direct, with very quick, stiff wing beats. Birds are almost always seen in flight.

Useful field marks: Grey body, pale rump, darker cap, slender wings and rapid wing beats.

Confusion species: Tree Martin. Tree Martins are paler below, have a paler rump, a plumper body and shorter wings.

  • Do not rely on size alone when birds are moving quickly through a cave entrance.
  • Record the direction of travel, entrance used and whether birds are carrying food or entering in groups.

Identification: Calls and echolocation

A species-specific call description is not available for field use here. Australian Swiftlets have the ability to echolocate, which helps them find nests and avoid obstacles in dark cave sections.

In a cave, do not assume that silent or apparently inactive birds are absent. Birds may be sleeping on nests in deep darkness.

Echolocation: Used in dark cave areas for navigation and nest finding.

  • Use a quiet approach and allow time for birds to settle before recording activity.
  • Avoid relying on a single pass through the entrance to assess occupancy.

Identification: Field signs

Active colonies may be identified by repeated bird traffic, groups circling near an entrance, rapid entry and exit flights, and birds sleeping on or near nests.

Nests are attached to smooth cave walls or roofs, usually in dark sections and often beneath overhanging rock. Nests can touch one another, and some are attached to other nests rather than directly to rock.

Dark guano deposits beneath nest areas can show that a cave has been used for a long time. Feathers at cave entrances or in predator scats may also confirm use.

Cave condition: Nests can be washed off, collapse or deteriorate when excessive water runs over them or saturates the nest material.

  • Fresh or recently occupied nests.
  • Accumulated guano beneath nest sites.
  • Repeated bird movement at dawn, dusk or during daytime feeding returns.
  • Feathers around cave entrances or in predator remains.

Distribution: Australian range

The Australian Swiftlet is resident in northern and north eastern Australia. Records and colony studies are concentrated in Queensland, with the species mapped in Queensland and New South Wales for project assessment purposes.

The species occurs in Queensland, including coastal north and central Queensland, the Wet Tropics, tropical islands and the inland Chillagoe, Mitchell and Palmer districts.

Important areas mentioned for colonies include Chillagoe, the Chillagoe to Mungana area, the Family Islands, Hinchinbrook Island, Dunk Island and coastal boulder areas near Finch Hatton.

Resident range: The species is resident and is not considered migratory.

Extent of occurrence: 223,000 square kilometres.

  • Queensland, coastal and island areas.
  • Queensland, inland limestone and karst districts.
  • Queensland, savanna around Chillagoe and Mungana.
  • New South Wales, mapped for this project context, but with limited site-specific colony information.

Distribution: Subspecies and regional forms

The Chillagoe Australian Swiftlet, Aerodramus terraereginae chillagoensis, is associated with the inland Chillagoe, Mitchell and Palmer districts.

The Coastal Australian Swiftlet, Aerodramus terraereginae terraereginae, is associated with coastal north eastern Queensland and nearby islands. Names and boundaries can vary between taxonomic treatments, so retain photographs, coordinates and colony details with any record.

Overseas range: The species is Australian. Related swiftlets occur on Pacific islands and in south eastern Asia, but those are different species.

  • Chillagoe and Mungana karst country.
  • Coastal forests, islands and sea caves.
  • Finch Hatton and nearby rocky country.

Distribution: Site assessment

A site may support a colony even when the entrance is small, difficult to see or separated from the main works area. Birds may use several entrances or separate sites within one cave system.

Check nearby caves, boulder piles, limestone outcrops, overhangs and concealed entrances before clearing, drilling, blasting, earthworks or major changes to drainage.

Queensland approval trigger: In Queensland, tampering with the breeding place of this least concern colonial breeder requires a high risk species management program.

  • Map all cave entrances and likely flight paths.
  • Search for guano, nests and feathers below overhangs.
  • Record bird activity at more than one time of day where safe and authorised.
  • Treat an occupied cave and connected cave spaces as one potential breeding place until assessed.

Habitat: Caves and karst

Australian Swiftlets use a mixture of savanna, coastal forest, rainforest and rocky terrain. Caves and rock structures are the most useful features to inspect on a development site.

Inland colonies occur in limestone caves and karst landscapes, including the Chillagoe, Mungana, Mitchell and Palmer districts.

Suitable caves can extend into totally dark sections. Most caves in a karst area may be unused, but a cave with a smooth overhanging roof, suitable darkness and protected access may support a colony.

Breeding habitat: Caves are a major breeding habitat. Rocky areas, including cliffs and mountain peaks, are also suitable.

  • Limestone caves and cave systems.
  • Sinkholes, rock chambers and concealed cave entrances.
  • Cave roofs, walls and internal constrictions.

Habitat: Coastal and island habitat

Coastal and island birds use granite boulder-roofed caves, sea caves and rocky shelter. The species has been recorded on islands including Hinchinbrook and Dunk Island, as well as other Family Islands.

A sea cave may be shared with insectivorous bats. Assess both the cave interior and the surrounding shoreline, boulder field and flight path.

Associated vegetation: Coastal forest, subtropical or tropical moist lowland forest and savanna may occur around foraging and roosting sites.

  • Granite boulder piles and boulder-roofed caves.
  • Sea caves and coastal rocky shelter.
  • Island cliffs, rock piles and sheltered cave entrances.

Habitat: Features to retain

Retain cave roofs, smooth overhangs, natural entrances and the surrounding vegetation that supports insect prey. Avoid blocking entrances or changing the character of the cave without a specialist assessment.

Where works are near a cave, inspect for water pathways. Concentrated runoff can wash nests from walls and roofs.

Water sensitivity: Excessive rain or concentrated water flow can wash nests from cave walls and cause colony loss.

  • Natural cave entrances and ventilation paths.
  • Smooth overhanging rock surfaces.
  • Vegetated areas around cave entrances and flight paths.
  • Natural drainage patterns above and through the cave.

Foraging habitat: Foraging areas

Australian Swiftlets forage on the wing during daylight and feed on flying insects. They may travel over forest, rainforest, savanna, islands and other open airspace around their colony.

Look for open flight space above coastal forest, rainforest, savanna, boulder fields, gullies and ridgelines. The species is associated with coastal and coastal island forests, as well as dry savanna around inland colonies.

Foraging habitat can extend beyond the cave or rocky shelter. Clearing near an entrance may affect flight access even if the cave itself is not removed.

Foraging period: Daylight.

Food: Flying insects.

  • Coastal and subtropical or tropical moist forest.
  • Savanna and open woodland around inland caves.
  • Island forest, rainforest edges and open airspace above boulder piles.
  • Gullies, ridges and other areas where flying insects concentrate.

Foraging habitat: Behaviour around caves

Returning birds may circle above a cave entrance for 1 to 6 minutes before entering. Numbers can build up before birds enter in rapid succession.

Departing birds may circle just inside the entrance before leaving as a group. These behaviours can help identify an active colony when nests are hidden from view.

Food transport: Adults carry invertebrate prey in the throat, held together in a bolus with adhesive saliva.

  • Watch from outside the flight path and avoid standing below the entrance.
  • Record the number of birds, direction of travel and time of observation.
  • Do not interpret a quiet period as evidence that the cave is unused.

Foraging habitat: Works planning

Avoid placing bright lights, dust-generating work, cranes or noisy machinery across a regular flight path. Keep access routes and laydown areas away from cave entrances where practicable.

Insect abundance may be lower during the dry season in savanna. Retain vegetation and natural water patterns around colonies where possible.

Flushing risk: Repeated approach, lighting, noise or obstruction near an entrance can disrupt entry, exit and feeding behaviour.

  • Use low spill lighting near caves.
  • Control dust and prevent material entering entrances.
  • Keep machinery and personnel out of the flight corridor.
  • Stage works away from the colony and adjust timing if birds show repeated avoidance or flushing.

Breeding habitat: Nest placement

Breeding occurs in colonies inside caves, usually in totally dark sections on smooth overhanging rock. Nests can be crowded and may be difficult to see until the cave is entered.

Nests are placed on cave walls and roofs, especially beneath smooth overhanging rock. In Queensland, nests often touch one another.

Some nests are attached to other nests rather than directly to the rock. This makes apparently bare rock above or beside an occupied patch sensitive to disturbance.

Nest spacing: Mean nearest-neighbour distance was 1.1 centimetres for A. t. terraereginae and 7.3 centimetres for A. t. chillagoensis. Nests may touch.

  • Smooth overhanging cave roofs.
  • Dark wall sections protected from predators and weather.
  • Internal ledges, recesses and areas above narrow cave passages.

Breeding habitat: Breeding cycle

Island colonies have a breeding season extending from July to April, with peak egg laying from November to February. Timing may vary between colonies and should not be used as a substitute for a site inspection.

Each clutch contains one egg. Up to three sequential clutches may be laid in one nest during the island breeding season. A nearly fledged older sibling may help incubate a later egg.

Recorded nesting season: July to April for island colonies.

Clutch: One egg.

  • Treat a colony as potentially active outside the peak period.
  • Check for adults on nests, eggs, nestlings and recently fledged young.
  • Do not enter a cave to inspect nests without a suitably experienced ecologist and the required approvals.

Breeding habitat: Recognising an active breeding place

An active breeding place may have fresh nests, adults entering or leaving, birds sleeping on nests, nestlings, eggs, fresh guano or repeated flight activity. A colony can remain active even when few birds are visible at the entrance.

Old guano deposits and collapsed or washed-off nests show previous use. They do not by themselves confirm current breeding, but they justify a careful assessment because colonies can reoccupy established sites.

Colony fidelity: The species uses established caves and colony sites over many years. Previously undocumented colonies can have deep guano deposits, showing that they are not newly established.

  • Freshly maintained nests or birds sitting on nests.
  • Adults carrying food into the cave.
  • Nestlings calling or moving at nest sites.
  • Recent guano below a dense nest patch.
  • Repeated entries and exits during observation.

Breeding habitat: Construction controls

Plan works outside the active nesting period where a colony has been confirmed, but do not rely on seasonal timing alone. A Queensland fauna ecologist should assess the colony and specify the exclusion area, observation method and works conditions.

Keep works outside the cave and away from the entrance, flight path and drainage route. Establish a site-specific buffer around the active colony. The buffer should prevent people, plant, vibration, lighting, dust and runoff from affecting nests or access.

Queensland management: A high risk species management program is required for tampering with the breeding place of this least concern colonial breeder.

  • Stop and reassess if birds are flushed repeatedly.
  • Do not enter occupied cave sections without approval and a controlled method.
  • Prevent water, sediment, smoke and construction material entering the cave.
  • Use a suitably qualified fauna spotter catcher where required by the approval or management program.

Sheltering habitat: Night roosts

Australian Swiftlets roost at night in colonies, mainly in caves and rocky shelter. Adults may sleep on their nests, including outside periods when active nests are obvious.

Night roosting has been recorded in inland and coastal boulder piles, limestone caves and sea caves. Birds may be distributed across the cave roof near their nest sites.

A cave with no obvious active nests may still be used as a night roost. Adult birds may continue to roost at a site after nesting activity has declined.

Roost behaviour: Birds may sleep on nests or close to nest sites in deep darkness.

  • Deep cave roofs and dark recesses.
  • Boulder-roofed caves and coastal rock piles.
  • Sea caves shared with other cave fauna, including insectivorous bats.

Sheltering habitat: Quiet or inactive birds

On cool days, birds may be difficult to detect and can remain in deep sleep across the cave roof. Only a small number may fly when approached.

This behaviour increases the risk of underestimating occupancy during a short inspection. Use indirect signs and avoid entering simply to obtain a closer look.

Detection caution: Low visible activity does not confirm that a cave is unused.

  • Inspect from outside first.
  • Use remote cameras or timed observations where appropriate.
  • Avoid repeated entry, handling or close approach.

Sheltering habitat: Protection during works

Protect the cave entrance, internal darkness, roof structure and natural airflow. Prevent lights from shining into the cave and avoid blocking the entrance with fencing, spoil, equipment or temporary structures.

Keep blasting, vibration, drilling and heavy vehicle movement away from occupied caves. If works must occur nearby, use a written method statement with monitoring and stop work triggers.

Special care: A roosting colony may be present even when there are no obvious active nests.

  • Maintain clear entry and exit routes.
  • Use screened, low-spill lighting.
  • Keep dust, smoke and fumes out of the cave.
  • Maintain natural drainage and prevent sudden water flow through the cave.

Colonies and breeding places: What a colony looks like

A colony is a group of Australian Swiftlets using the same cave, cave system or rocky shelter for breeding or roosting. Colonies can be concentrated, faithful to established sites and separated into several entrance or cave sections.

A colony may occupy one wall or roof section, several areas within a cave, or separate entrances within the same cave system. Sites can include front, middle and rear sections, side and bottom colonies, or combined colonies using more than one entrance.

Nest density can be high. In some Queensland colonies, nests touch one another and may form a dense patch beneath a suitable overhang.

Recorded colony size: A peak count of 500 pairs was recorded in one colony in 1985 to 1987.

Chillagoe total: More than 8,000 birds were counted across 53 current colonies in 2021.

  • Repeated groups of birds entering one or more entrances.
  • Dense nest patches on smooth overhanging rock.
  • Guano accumulation below nest areas.
  • Multiple occupied sections within one cave.

Colonies and breeding places: Colony locations

For this species, inspect caves and rocky shelter rather than relying on general colonial bird examples such as wetland trees, reedbeds, islands or riverbanks. Coastal islands and sea caves can be important, while inland colonies occur in limestone karst and boulder-roofed caves.

Nearby vegetation still matters because it supports flying insects and provides the surrounding flight space used by returning and departing birds.

Colony structure: A cave may contain separate colonies at different entrances or in different internal sections.

  • Limestone caves and karst chambers.
  • Inland and coastal boulder piles.
  • Granite boulder-roofed caves.
  • Sea caves and island rocky shelter.
  • Smooth overhanging cave roofs and dark internal recesses.

Colonies and breeding places: Site fidelity and flooding

Established caves can be used for many years. Some previously undocumented colonies had deep black guano deposits, showing prolonged use rather than recent establishment.

Flooding and excessive rain can wash nests from cave walls. A colony may decline or disappear after a major water event, then require careful monitoring before the site is treated as vacant.

Water management: Runoff, flooding and oversaturation can remove nests and damage breeding habitat.

  • Map each entrance and internal colony section separately.
  • Record old guano, washed-off nests and water marks.
  • Check whether proposed drainage works could concentrate water through the cave.
  • Do not seal or fill a cave because no birds were seen during one visit.

Colonies and breeding places: Buffers, disturbance and timing

Colonies need more care than isolated animals because one cave can contain a substantial share of the local population. Disturbance at the entrance can affect many birds at once and may interrupt feeding, roosting or access to nests.

Set a site-specific buffer around an active colony. The buffer should include the cave, entrance, flight path, adjacent rock shelter and any drainage route that could affect nests. Keep works outside the active nesting period where practicable, and maintain controls if birds continue to roost at the site.

Disturbance distance: No universal species-specific distance is established here. Use a risk-based buffer set by the project ecologist and relevant Queensland approval.

  • Keep workers and machinery away from the entrance and flight path.
  • Avoid repeated entry, flushing, bright lighting, blasting and high vibration.
  • Use visual screening and low-spill lighting where nearby work cannot be avoided.
  • Stop work if birds are repeatedly flushed, abandon the entrance or collide with structures.
  • Have an ecologist confirm when the site can be released from colony controls.

Threats: Cave damage and loss

The Australian Swiftlet is currently considered least concern, but a local colony can be affected quickly because birds are concentrated at a small number of breeding and roosting places. Development controls should focus on direct cave damage, disturbance, water flow and loss of surrounding foraging habitat.

Blasting, excavation, quarrying, roadworks and construction can remove or destabilise cave roofs, overhangs and entrances. Filling, sealing or blocking a cave can prevent access to nests and roosts.

Do not assume that a small or partly collapsed entrance is unused. Inspect the wider rock formation and any connected openings before works begin.

Primary site risk: Loss or alteration of a breeding cave can affect many birds at the same time.

  • Cave collapse or roof damage.
  • Destruction of smooth overhanging nest surfaces.
  • Blocking, sealing or fencing across an entrance.
  • Dust, sediment or construction material entering the cave.

Threats: Disturbance and flushing

People, machinery, lighting, vibration, blasting and noise near an entrance can flush birds or disrupt entry and exit. Repeated disturbance may be particularly harmful where nests are dense or access is limited to one entrance.

Avoid entering occupied cave sections for routine inspections. Use an experienced ecologist to design any required survey or monitoring.

Flushing indicator: Repeated circling, delayed entry, rapid exit or abandonment of the entrance indicates that works may be disturbing birds.

  • Keep personnel and plant outside the flight path.
  • Schedule unavoidable work away from active nesting where practicable.
  • Use stop work triggers for repeated flushing or abandoned entries.
  • Control artificial light, dust and smoke.

Threats: Flooding and altered drainage

Excessive rain can wash nests from cave walls and roofs. Earthworks, drains, culverts, roads and hard surfaces can concentrate water into a cave that previously had natural drainage.

Inspect upstream catchments, cave entrances and internal water pathways. Keep runoff out of nest areas and maintain natural flow patterns where possible.

Observed impact: Excessive rain has washed nests from colony walls and caused substantial colony losses at studied caves.

  • Concentrated stormwater entering the cave.
  • Temporary dewatering or pumping that changes cave moisture.
  • Sediment or contaminated water flowing across nests.
  • Drainage structures that redirect water toward colony sections.

Threats: Loss of foraging habitat and insects

Clearing coastal forest, rainforest, savanna or island vegetation can reduce flight space and insect habitat around a colony. Insect declines may also reduce food availability, particularly where the surrounding habitat is already fragmented.

Retain vegetation around cave entrances and avoid unnecessary clearing along regular flight paths. Manage weeds, fire, dust and pesticide use so that insect prey and cave access are not reduced.

Food source: Flying insects are the main food source, and adults forage during daylight.

  • Clear only the minimum area needed for the works.
  • Retain native vegetation around caves and rocky shelter.
  • Avoid broad pesticide use near colonies.
  • Limit night lighting and maintain dark flight corridors.

Survey methodology: 1. Desktop assessment

Australian Swiftlets are usually detected at caves, boulder piles and other dark roosting places. Surveys should focus on the breeding place itself, the entrance and the flight path used by birds entering and leaving.

Map known caves, karst areas, coastal and inland boulder piles, rock overhangs and nearby vegetation that may support night roosting. Check records for colonies, former colony sites and caves used by other Australian Swiftlet colonies.

Treat a cave with dark, smooth, overhanging surfaces as potential breeding habitat, even if birds are not seen during a short visit. The species is resident, so a site should not be dismissed as seasonal habitat.

Breeding habitat: Caves are the main known breeding habitat. Rocky areas and boulder-roofed caves may also be suitable.

Breeding season: Island colonies have been recorded breeding from July to April, with peak egg laying from November to February. Timing varies between colonies.

Colony scale: A single colony has been recorded with 500 pairs. More than 8,000 birds were counted across 53 current colonies at Chillagoe in 2021.

  • Review landholder, reserve and local natural history records before planning access or works.
  • Identify cave entrances, internal chambers, narrow constrictions, access tracks, lighting, blasting areas and proposed machinery movements.
  • Confirm whether the site is in Queensland or New South Wales and identify the relevant state approval pathway.

Survey methodology: 2. Cave and colony inspection

Use an experienced ecologist or fauna spotter catcher familiar with cave fauna. Obtain permission before entering a cave and use a safe, low impact inspection method.

Inspect the darkest parts of the cave, cave roofs and smooth overhanging rock surfaces. Australian Swiftlet nests can be crowded, can touch one another and may be attached to other nests rather than directly to rock.

Nest density: Mean nearest nest distance was 1.1 cm for A. t. terraereginae and 7.3 cm for A. t. chillagoensis. Some nests touch.

Roosting behaviour: Adults sleep on nests in dark cave areas. Birds may also use cave entrances, boulder piles and, rarely, foliage.

Entry behaviour: Returning birds may circle above a cave entrance for 1 to 6 minutes before entering in a rapid group movement.

  • Survey the entrance, twilight zone and all accessible dark chambers without touching nests or roosting birds.
  • Look for small saliva nests, birds sleeping on nests, fresh guano, feathers, eggs, nestlings and repeated entry and exit activity.
  • Use a quiet observation point outside the entrance where possible. Avoid walking beneath nests or shining lights directly at birds.
  • Do not use smoke, playback, mist nets or trapping unless specifically authorised under the relevant permit and approved method.

Survey methodology: 3. Timing, effort and conditions

Plan at least one survey during a period when birds are likely to be using the site. A single visit may miss a colony, particularly when birds are roosting deeply inside a cave or when weather changes activity.

For a construction proposal, survey all accessible cave chambers and entrances that could be affected. Repeat the inspection if the first visit is inconclusive, if works change, or if birds are observed using the area.

Known monitoring approach: Daily time lapse photography has documented nesting activity, sequential clutches and sibling incubation at an island colony.

Weather sensitivity: Excessive rain and flooding can damage nests and cause colony losses.

  • Observe the entrance during daylight and remain long enough to record repeated arrival and departure activity.
  • Where safe and permitted, inspect the cave during the day when roosting birds can be located on cave roofs and near nests.
  • Avoid surveying during heavy rain, flooding or unsafe cave conditions. Record rainfall and recent flooding because nests can be washed from cave walls.
  • Use remote cameras or time lapse photography where repeated visits could disturb a colony.

Survey methodology: 4. Records and reporting

Record enough detail for another ecologist to relocate the colony and understand the likely impact of the proposal. Photograph from a safe distance and do not disturb nests or birds for identification.

Report suspected breeding places promptly to the project manager and the relevant regulator where required.

  • Record date, time, observers, weather, recent rainfall, survey duration and survey conditions.
  • Map every entrance, nest area, roost area, access route and proposed impact area using coordinates or a clear site plan.
  • Count birds where possible, but do not enter a chamber or flush birds to obtain a count.
  • Record active nests, eggs, nestlings, fledglings, sleeping birds, guano, feathers, abandoned nests and evidence of flooding.
  • Describe lighting, noise, vibration, blasting, machinery, vegetation clearing and changes to drainage near the cave.

Before habitat disturbance: 1. Approvals and legal checks

Avoiding an active colony is the safest management option. Treat a cave, boulder pile or rock overhang as a potential breeding place until a competent survey confirms that the proposed works will not affect it.

Confirm the approval pathway before works begin. Australian Swiftlet is listed as least concern in Australia, but Queensland applies special controls to least concern colonial breeders.

In Queensland, tampering with the breeding place of a least concern colonial breeder requires the high risk species management program pathway under the Nature Conservation (Animals) Regulation 2020. Confirm the current requirements with the Department of the Environment, Tourism, Science and Innovation before disturbing a breeding place.

  • Check whether the action needs an EPBC Act referral because of impacts to listed matters, protected areas or other protected species.
  • Obtain any Queensland species management program approval, permit or authority required for the proposed action.
  • Check New South Wales licensing, threatened species, national park and cave access requirements where the project is in New South Wales.
  • Confirm landholder, reserve, workplace health and safety, cave access and cultural heritage permissions.
  • Keep approvals, survey reports, maps, conditions and contact details at the work front.

Before habitat disturbance: 2. Avoidance and work design

Redesign the work where possible so the colony, cave roof, cave entrance and flight path remain undisturbed. Do not block an entrance or alter drainage that supplies water to a cave.

A colony may contain a large share of the local population. Crowded nests and repeated use of the same cave mean that damage to a small area can affect many birds.

Disturbance approach: No universal species specific buffer is established here. Use a precautionary, site specific buffer set by the ecologist and regulator.

  • Leave the cave and all active nest surfaces intact.
  • Keep blasting, drilling, vibration, earthworks, vehicle movement, dust, smoke and artificial lighting away from the cave entrance and internal colony.
  • Do not seal, gate, illuminate or modify a cave without a species specialist assessment and written approval.
  • Set a site specific no entry and no works buffer around the active colony, based on the cave layout, flight path, activity and regulator conditions.
  • Keep works outside the local nesting period where feasible. For island colonies, July to April is a known breeding period, with peak egg laying from November to February. Confirm local timing rather than relying on a calendar alone.

Before habitat disturbance: 3. Pre-clearance survey

Complete the final inspection shortly before works start. The inspection should cover the proposed footprint, access routes, spoil areas, drainage lines, lighting locations and any cave or boulder pile that could be affected indirectly.

An inactive entrance does not by itself show that the site is unused. Look for nests, guano, feathers, sleeping birds and recent entry activity.

  • Inspect all accessible breeding surfaces and roost areas.
  • Check for active nests, eggs, nestlings, fledglings and adults sleeping on nests.
  • Confirm that exclusion zones are marked on the ground and shown on the construction plan.
  • Stop the start of works if an active colony or previously unknown cave is found.
  • Have a fauna spotter catcher or other suitably authorised person available for the first disturbance near potential habitat.

Before habitat disturbance: 4. Induction and exclusion controls

Every person working near the site should know that the cave is a protected breeding place when active. Keep the message simple and repeat it at toolbox talks.

Cave entry should be limited to approved personnel. Unplanned recreational or contractor access can flush birds and damage closely packed nests.

  • Mark exclusion zones with durable signs and barrier tape before machinery arrives.
  • Show workers photographs or maps of the colony, cave entrance, flight path and no entry areas.
  • Prohibit lighting of the cave, loud noise at the entrance, smoking, fires, smoke testing and unauthorised entry.
  • Nominate the fauna spotter catcher as the person who can stop work.
  • Display the fauna spotter catcher and environmental manager contact numbers at the work front.

During habitat disturbance: 1. Sequential clearing and supervision

Use a staged and closely supervised work method. The fauna spotter catcher must have clear authority to stop work whenever a bird, nest, colony or roost is found or when conditions differ from the approved plan.

Clear in small, defined stages and inspect each stage before moving to the next. Start with the least sensitive area and retain the cave, entrance, roosting surfaces and flight path wherever possible.

For works near a cave, use hand methods or low impact equipment where practicable. Keep machinery, lighting and personnel outside the approved exclusion zone.

  • Brief the crew before each stage of work.
  • Check the work area immediately before disturbance and again after each stage.
  • Keep an unobstructed escape route for any animal that leaves a roost or adjacent vegetation.
  • Stop work if birds begin repeated alarm flights, mass flushing, collision risk behaviour or rapid abandonment of a nest area.
  • Do not chase, catch or handle free flying swiftlets.

During habitat disturbance: 2. Response to an active breeding place or colony

If an active nest, colony or roost is found, stop the activity that could affect it. Keep people and machinery away and contact the project ecologist and regulator as required by the approval.

Do not remove, relocate, repair or wash a nest. Nests can be damaged by touch, vibration, excessive water and changes to the cave environment.

Colony risk: Flooding and excessive rain have washed nests from cave walls and caused losses at monitored colonies.

  • Establish a temporary exclusion zone that covers the nest area, the cave entrance and the active flight path.
  • Reduce noise, lighting, dust, vibration and movement near the colony.
  • Record the location, number of nests, bird behaviour, stage of breeding and the activity that caused the stop.
  • Obtain written advice before changing the work method or restarting.
  • If flooding, stormwater or drainage works threaten the colony, stop the water related activity and obtain specialist advice immediately.

During habitat disturbance: 3. Handling and injured animal response

Only an authorised and trained person should handle an Australian Swiftlet. Most flying birds should be left alone and protected from further disturbance.

If a bird is injured, contained or grounded, keep it in a quiet, dark, well ventilated container and seek veterinary or wildlife carer advice promptly.

  • Do not give food or water unless directed by a wildlife rehabilitator or veterinarian.
  • Keep the container away from machinery, dogs, children, heat, direct sunlight and loud noise.
  • Record the location, time, apparent injury, circumstances and photographs if this can be done without further stress.
  • Follow the relevant state wildlife rescue, veterinary and permit requirements for transport and rehabilitation.
  • Release or relocate an animal only when directed by an appropriately authorised wildlife professional.

During habitat disturbance: 4. Incident records and stop work reporting

Treat an active colony, nest damage, bird injury, cave flooding, unapproved entry or unauthorised disturbance as an environmental incident. Record the facts while they are fresh.

The project manager should review the incident with the ecologist and approval holder before work resumes.

  • Record the date, time, location, people involved, equipment, weather and work stage.
  • Describe the animal response, nest condition, number of birds affected and any photographs or video.
  • Record who stopped work, who was contacted, advice received and the time work resumed.
  • Notify the regulator, approval holder or land manager when required by the approval conditions.
  • Update the site induction and method statement if the incident exposes a control failure.

After habitat disturbance: 1. Post clearance inspection

A site is not clear simply because no bird is seen after machinery leaves. Complete a formal inspection, confirm that the colony and cave remain usable, and close out all approval and incident conditions.

Inspect the work area, cave entrance, colony surfaces, drainage and flight path after each disturbance stage and at the end of the activity. Look for damaged nests, displaced birds, trapped animals, new barriers and changed water flow.

Use the same map and observation points as the pre-clearance survey so changes can be compared.

  • Check that exclusion fencing and signs remain in place where required.
  • Inspect for injured or grounded birds and report them through the authorised wildlife pathway.
  • Check that dust, spoil, waste, sediment, lights and temporary structures have not entered the cave or blocked flight paths.
  • Remove temporary equipment only after the ecologist confirms that it will not disturb the colony.
  • Record whether the colony remains occupied and whether birds are entering and leaving normally.

After habitat disturbance: 2. Reporting and compliance close out

Prepare a short completion report for the project manager, approval holder and regulator where required. Keep it with the environmental records for the site.

Report any breach, nest loss, injury, colony abandonment or unapproved disturbance under the relevant approval conditions.

  • Include survey dates, methods, personnel, maps, photographs, bird and nest observations, work stages and incidents.
  • Document all stop work events and corrective actions.
  • Confirm that all conditions of the EPBC referral decision, Queensland species management program, state permit or other approval have been met.
  • Retain records of wildlife handling, veterinary advice, rehabilitation and release decisions.
  • Update the colony location and status in the project geographic information system and fauna register.

After habitat disturbance: 3. Monitoring and adaptive management

Where works occurred near an active or historically used colony, arrange follow up checks during the next suitable breeding period. The frequency and duration should reflect the colony size, sensitivity of the work and approval conditions.

Use non intrusive observation or remote cameras where possible. Avoid repeated entry to the cave.

  • Compare bird activity, nest condition, guano and entrance use with the baseline survey.
  • Check after major rainfall or flooding if the cave or drainage was altered.
  • Review lighting, noise, vibration, access control and water management if birds reduce their use of the site.
  • Extend or strengthen controls if the colony shows disturbance or nest loss.
  • Close monitoring only when the ecologist and regulator, where relevant, agree that the risk has reduced.

After habitat disturbance: 4. Relocated or rehabilitated animals

Do not move an Australian Swiftlet colony or nest as a routine mitigation measure. Cave nests are closely packed and depend on specific dark, sheltered surfaces.

Any individual bird in care should remain under the direction of an authorised wildlife rehabilitator or veterinarian until release is approved.

  • Record the receiving carer, facility, permit details, treatment, outcome and release location.
  • Release a rehabilitated bird only when its fitness, weather conditions, food availability and release site have been assessed by the authorised professional.
  • Do not release a bird into an occupied colony or cave without specialist advice.
  • Review the cause of injury before release so the same hazard is not left in place.

Rehabilitation actions: 1. Restore the breeding place

Restore the cave environment and nearby flight paths rather than trying to recreate a colony elsewhere. Australian Swiftlets use specialised dark cave surfaces, and artificial structures should only be considered after a species specialist confirms that they suit the site.

Protect the cave, boulder pile, rock overhang and entrance from further disturbance. Reinstate natural drainage where construction has changed water flow, while avoiding sudden water discharge onto nests or cave walls.

Remove spoil, rubbish, temporary lighting and barriers that obstruct access or alter the cave environment.

Water management: Flooding and excessive water can wash nests from cave walls. Drainage design should prevent concentrated flows onto nesting surfaces.

  • Stabilise eroding ground outside the entrance without narrowing or blocking the flight path.
  • Control sediment and dirty water so it does not enter the cave.
  • Avoid sealing cracks, filling cavities or smoothing natural rock surfaces used by birds.
  • Retain dark, sheltered areas and do not install permanent lighting in or near the colony.
  • Use low impact access controls that prevent people entering sensitive areas while allowing birds to enter freely.

Rehabilitation actions: 2. Replant and manage surrounding habitat

Restore cleared ground around cave entrances and access routes with locally appropriate native plants. The aim is to stabilise soil, reduce dust and maintain natural insect habitat without blocking the entrance or flight path.

Australian Swiftlets forage on flying insects, so broad habitat quality around the site supports the species even though the nest is in a cave.

  • Use local native species suited to the soil, rainfall and aspect.
  • Control weeds without herbicide drift, smoke, fire or machinery disturbance near the colony.
  • Keep vegetation low enough to maintain safe entry and exit routes.
  • Control erosion and sediment before planting.
  • Avoid bright night lighting that attracts insects away from the cave or changes the dark entrance environment.

Rehabilitation actions: 3. Artificial structures and replacement sites

Do not install a nest box, bat box or artificial nest site as a default replacement for a damaged cave. Australian Swiftlets use dark caves and smooth overhanging rock surfaces, and a poorly placed structure may attract other fauna while providing no benefit to this species.

Consider an artificial structure only where a qualified swiftlet ecologist designs it for the local colony and the regulator accepts it as part of an approved management response.

  • Prefer protection and repair of the original cave over replacement structures.
  • Assess darkness, temperature, humidity, shelter from rain, surface texture, predator access and safe flight access before proposing an artificial site.
  • Keep any bat box or roost structure separate from the swiftlet colony unless a specialist confirms that shared use is safe. The species has been recorded sharing a sea cave with insectivorous bats.
  • Do not move nests or attach artificial nests without written approval and an authorised method.
  • Monitor any approved artificial site with remote cameras or non intrusive checks and remove it if it creates a hazard.

Rehabilitation actions: 4. Long term monitoring

Set a monitoring program that matches the scale of the impact. A small access upgrade may need seasonal checks, while cave works, flooding or colony disturbance may require several breeding seasons of follow up.

Use consistent observation points and methods so changes in occupancy and nest condition can be detected.

  • Check the entrance, flight path, roosting surfaces and drainage after construction and after major rainfall.
  • Record birds entering and leaving, active nests, nest condition, guano, lighting, noise and water flow.
  • Use remote cameras where repeated entry could disturb the colony.
  • Compare results with the pre-work baseline and the previous monitoring visit.
  • Continue controls or undertake corrective works if occupancy, nest condition or entry activity declines.

Rehabilitation actions: 5. Rehabilitation completion

Close rehabilitation only when the site is stable, safe and functioning without ongoing construction impacts. Keep the colony protection measures in the site environmental plan for future maintenance and emergency works.

Record lessons from the project and apply them to other caves and colonial breeding places in the region.

  • Confirm that revegetation is established, weeds are controlled and erosion is stable.
  • Confirm that drainage does not concentrate water onto nests or cave walls.
  • Remove redundant temporary structures and retain approved permanent exclusion controls.
  • Provide the final map, photographs, monitoring results and maintenance responsibilities to the land manager.
  • Induct future maintenance crews before they work near the cave or colony.

Sources