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Whiskered Tern (Chlidonias hybrida)

The Whiskered Tern is a small marsh tern that breeds in loose colonies on shallow freshwater wetlands, temporary swamps and marshes across much of Australia. Colonies can contain many nests in a small area, so clearing, construction, water level changes and human access near an active colony need careful planning. The species is Least Concern in Australia, but Queensland treats it as a least concern colonial breeder, and 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.

Migration and breeding season

Whiskered Terns breed in Australia, mainly in southern inland wetlands, with breeding recorded from September to December. Timing is erratic and responds to rainfall, flooding, water levels and wetland condition, while tropical birds may be resident, nomadic or locally dispersive.

Breeding mode: Breeds in loose colonies, usually raising one brood per season.

Clutch size: Usually 1 to 3 eggs.

Incubation: Not recorded.

Fledging: Young may fledge at about 21 days.

Age at maturity: Breeding generally begins from the third calendar year, although some birds breed later.

Nest and breeding place: A rough raft or heap of aquatic vegetation, floating, moored to plants or resting on the bottom in very shallow water.

Colony timing can shift substantially between years and regions because breeding wetlands are often temporary and respond to rainfall, flooding, water levels and available floating or emergent vegetation.

  • Breeding in Australia, mainly southern inland wetlands: Breeding is recorded from September to December, but colonies may form at other times when wetland conditions are suitable.
  • Dependent young and fledglings: Young are present during and after the breeding period, with fledging occurring at about 21 days.
  • Breeding overseas, southern Europe and Asia: Some overseas populations breed from May to early June, so this timing should not be applied directly to Australian colonies.
  • Southward arrival in Australia: Southern Australian records begin around September, following the return from northern wintering areas, but arrival timing varies between populations.
  • Non-breeding presence in Australia: Whiskered Terns occur widely across mainland Australia outside the main breeding period, with tropical birds sometimes resident or locally dispersive.
  • Northward departure from southern Australia: Many Australian birds move north towards Indonesia and South-East Asia during autumn and winter, although exact departure months are variable.
  • Highest clearing risk: The greatest risk is from September to December, when active colonies, eggs and nestlings may be present, with residual risk into January and February where late breeding or dependent young occur.

Identification: Appearance

Whiskered Terns are small, dark marsh terns that fly lightly over wetlands. They can be overlooked when seen at a distance, particularly outside the breeding season, so check the head pattern, tail shape, flight behaviour and calls together.

Breeding adults have a black crown, white cheeks and sides of the neck, grey upperparts, dark grey underparts, a white undertail and mainly white underwings. The bill and legs are red, and the eye is brown.

Outside the breeding season, the underparts become white, the forehead is white, the dark crown is streaked with white, and the bill and legs are blackish. Juveniles are mottled grey and brown, with a pale grey tail edged in black.

Body shape: Small and tubby, with a short, slightly forked tail.

Length: About 23 to 25 cm.

Colour: Black, grey, white and, in breeding adults, red bill and legs.

Identification: Calls and similar species

Calls include a long, hoarse kerch, kerrrk and an abrupt kittitt. A characteristic krekk call is also reported.

The species may be confused with other marsh terns, including White-winged Black Tern. Its stocky shape, short forked-looking tail and wetland patrol flight help separate it from Common Tern and other sea terns.

  • Listen for repeated hoarse calls from birds circling a wetland or mobbing an intruder.
  • Check whether the bird is hawking and dipping over shallow wetland vegetation rather than making repeated sea-tern style plunges.

Identification: Field signs

A breeding colony is usually identified by several terns repeatedly circling, calling and mobbing an approaching person, vehicle or predator. Birds may fly low over the colony before settling back onto nests.

Look for rough rafts or heaps of aquatic vegetation floating on, moored in, or resting near shallow water. Droppings, feathers and flattened vegetation may occur around frequently used nest areas or access points.

  • Repeated alarm calls and mobbing behaviour.
  • Small groups of adults carrying vegetation or feeding young.
  • Floating or moored vegetation platforms with birds sitting low over the water.
  • Chicks or recently fledged birds sheltering among wetland plants.

Distribution: Australian range

Whiskered Terns are widespread but unevenly distributed in Australia. They occur in inland and coastal wetlands, with breeding concentrated in suitable wetland conditions rather than in every part of their broad range.

The species is mapped in New South Wales, the Northern Territory, Queensland, South Australia, Tasmania, Victoria and Western Australia. It is scattered across much of mainland Australia, except the most arid areas, and is found on the coast and inland.

It is most numerous in the south east interior and breeds mainly south of about 25 degrees south. In Tasmania it is recorded mainly as a vagrant.

  • Inland swamps, marshes and floodwaters.
  • Large dams, lakes and reservoirs.
  • Coastal lagoons, estuaries, mangrove creeks and tidal mudflats.
  • Sewage farms, irrigated croplands and other artificial wetlands.

Distribution: Seasonal movements

Whiskered Terns are migratory and nomadic in Australia. Large numbers move north into Indonesia and South East Asia, mainly through the Top End.

Movement and breeding can vary with rainfall, flooding, water levels and wetland vegetation. A wetland that is empty during one inspection may become suitable later in the season.

  • Treat wetland habitat as seasonally dynamic.
  • Check suitable sites again after substantial rain, flooding or changes in water levels.
  • Do not assume that a lack of birds during one visit means the site is not used.

Distribution: Overseas range

The species has separate breeding populations in southern Europe and Asia, south eastern Africa and Madagascar, as well as Australia. Tropical populations are more likely to be resident, nomadic or locally dispersive.

Habitat: Wetland features

Look for Whiskered Terns wherever shallow water is mixed with floating or emergent vegetation. Their breeding habitat can be temporary, and its suitability may change quickly as water levels and plant growth change.

Preferred sites include shallow freshwater swamps, inland marshes, floodwaters, lakes, large dams and reservoirs. The species also uses brackish and saline lakes, sewage farms, irrigated croplands and other artificial wetlands.

Breeding sites often have broad shallow water with well developed floating and emergent vegetation. Some nests occur over water about 60 to 80 cm deep, while others rest on the bottom in very shallow water.

  • Floating mats or beds of aquatic plants.
  • Emergent reeds, rushes or other wetland vegetation.
  • Shallow pools separated by wetland plants.
  • Temporary water bodies that retain vegetation after flooding.

Habitat: Site features to inspect

During a site inspection, scan the wetland edge, floating vegetation and sheltered shallow water rather than only the open water surface. Check islands, plant mats, flooded vegetation and quiet corners that are difficult to reach from the bank.

A colony may be within a larger wetland complex and may shift between ponds, reservoirs or wetland compartments as conditions change.

  • Shallow margins and flooded depressions.
  • Floating and moored vegetation rafts.
  • Islands, isolated plant beds and sheltered wetland corners.
  • Nearby dry paddocks or plains used for insect hawking.

Habitat: Water management

Water management can determine whether a wetland supports nesting, feeding or neither. Rapid drawdown, inundation of nests, drainage, poor water quality and loss of aquatic plants can reduce habitat value.

Coordinate works, pumping, dewatering and water level changes with ecological inspections. Where a colony is present, avoid sudden changes that could strand nests, flood them or remove the vegetation supporting them.

  • Record water depth, water level trends and wetland vegetation during each inspection.
  • Retain connected shallow water and suitable floating or emergent plants where practicable.
  • Consider rainfall and flooding forecasts when setting the work program.

Foraging habitat: Feeding behaviour

Whiskered Terns forage over water, wetland vegetation, nearby paddocks and sometimes dry plains. Their feeding area may extend beyond the visible colony, so works should consider surrounding wetlands and open insect-rich areas.

The species usually patrols back and forth about 5 to 10 m above the water. It hawks insects in the air, dips to the water surface and may hover before plunging into shallow water.

Foraging birds may be seen alone, in small groups or in mixed flocks. They often return repeatedly to productive wetland edges.

  • Hawking insects above wetland plants or nearby paddocks.
  • Dipping insects from the water surface.
  • Plunging for fish, amphibians or aquatic prey.
  • Flying low over open water and flooded vegetation.

Foraging habitat: Food and habitat links

Food includes small fish, amphibians, crustaceans, insects and insect larvae. The species may also take spiders, frogs, tadpoles, small crabs and shrimps.

Foraging is usually close to breeding sites, commonly within about 1 km, but birds may travel up to 9 km when conditions require it.

  • Retain shallow water and aquatic vegetation that support prey.
  • Avoid unnecessary disturbance to nearby feeding areas while a colony is active.
  • Keep access routes and machinery away from repeatedly used feeding edges where practicable.

Foraging habitat: Worksite observations

Repeated low flights over a wetland, dipping at the surface or carrying prey towards a plant bed can indicate a nearby colony. Follow the direction of travel and inspect suitable floating or emergent vegetation from outside the wetland.

  • Record flight direction and approximate height.
  • Map regular feeding areas as well as nest locations.
  • Use quiet observation points and avoid walking through wetland vegetation to confirm a suspected colony.

Breeding habitat: Nest and breeding place

Whiskered Terns breed in loose colonies on large, often temporary inland swamps and marshes. Breeding timing is erratic and responds to climatic conditions, rainfall, flooding and the availability of suitable aquatic plants.

The nest is a rough raft or heap of aquatic vegetation. It may float, be moored to vegetation, or rest on the bottom in very shallow water.

Suitable breeding places have open shallow water mixed with well developed floating or emergent plants. Carp ponds, dam reservoirs, flooded meadows, temporary marshes and other managed wetlands can all support colonies when conditions are suitable.

  • Floating plant mats and anchored vegetation.
  • Shallow flooded vegetation.
  • Quiet wetland compartments with limited wave action.
  • Temporary wetlands that retain water through the breeding period.

Breeding habitat: Breeding timing

In southern Australia, breeding is commonly reported from September to December, but timing varies. Colonies may establish from early spring through summer when water and vegetation conditions are suitable.

The species usually raises one brood in a season. Both sexes build the nest, incubate and care for the young.

  • Survey before clearing or construction where suitable habitat is present.
  • Repeat checks if water levels, rainfall or bird activity change.
  • Treat an active colony as present until a suitably qualified ecologist confirms that breeding has finished.

Breeding habitat: Recognising an active breeding place

An active breeding place may contain sitting adults, eggs, chicks, recently fledged young, fresh nest material or adults repeatedly carrying food. Alarm calling and coordinated mobbing are strong warning signs.

Do not enter floating plant beds or shallow nesting areas to inspect nests. Use binoculars or a spotting scope from outside the wetland and record the location without approaching the colony.

  • Adults sitting low on vegetation rafts.
  • Freshly built or repaired nests.
  • Chicks, fledglings or adults carrying food.
  • Repeated alarm calls, circling and mobbing.

Sheltering habitat: Likely shelter and rest areas

Separate roosting sites are poorly documented for this species, but Whiskered Terns require quiet wetland areas for resting between feeding flights and during movement periods. Floating vegetation, wetland margins and nearby low disturbance areas may all be used.

Look for sheltered floating plant beds, emergent vegetation, small islands, exposed mud or low banks near feeding water. Birds may rest in groups on vegetation or open edges when they are not feeding.

Non breeding birds may use a wide range of freshwater, brackish and saline wetlands, including reservoirs, floodwaters, sewage farms and coastal lagoons.

  • Dense emergent vegetation protected from wind and waves.
  • Floating vegetation mats near open feeding water.
  • Quiet islands, mud edges and low wetland banks.
  • Undisturbed margins of dams, ponds and marshes.

Sheltering habitat: Managing access

Approaching a resting group can cause repeated flushing and may displace birds from a wetland. Keep people, vehicles, dogs and machinery away from occupied resting areas where practicable, especially during repeated use.

Use existing tracks and establish observation points outside the wetland. Avoid driving through shallow water, floating plant beds or mud margins.

  • Minimise vehicle movements along wetland edges.
  • Keep noisy or prolonged works away from occupied wetland margins.
  • Stop and reassess if birds repeatedly flush from the same area.

Sheltering habitat: Roost information for field planning

A large communal roost or fixed maternity roost is not a typical feature described for Whiskered Terns. Plan for flexible use of wetland habitat rather than relying on one permanent roost location.

Record resting groups, repeated flight paths and any areas where birds return after disturbance. These observations can help define practical no access areas for the work program.

Colonies and breeding places: What a colony looks like

Whiskered Terns are colonial breeders. A colony may look like scattered birds over a broad wetland, but the nests can be close together and a single breeding place can hold a substantial share of the local population.

Colonies are usually loose groups on floating or emergent wetland vegetation. Nests may be spread through plant beds, separated into several groups, or distributed across a pond, reservoir or wetland complex.

Recorded colonies range from 10 to 100 pairs, and some colonies have contained several to more than 150 nests. Neighbouring nests may be 1 to 5 m apart.

  • Many adults flying, calling and settling over one wetland area.
  • Repeated mobbing of people, vehicles, predators or birds of prey.
  • Several rough vegetation nests within a floating or emergent plant bed.
  • Other waterbirds, including Hoary-headed Grebes, nesting among the terns.

Colonies and breeding places: Site fidelity and colony movement

Colony location is not necessarily fixed from year to year. Birds can move between ponds, reservoirs and wetland compartments as water levels, aquatic plants, flooding and farming conditions change.

A site used in a previous year should be treated as a potential breeding place when suitable water and vegetation return. Conversely, a colony may be absent during an inspection and establish later.

  • Review previous ecological records and aerial imagery.
  • Inspect nearby wetlands if birds are present but nests are not found at the expected location.
  • Recheck after flooding, filling, rainfall or substantial plant growth.

Colonies and breeding places: Disturbance and flushing risk

The whole colony may take flight to mob an intruder. Repeated flushing exposes eggs and chicks, interrupts incubation and feeding, and can cause birds to abandon a breeding place.

Disturbance can come from clearing, earthworks, piling, drilling, pumps, boats, drones, vehicles, dogs, pedestrians and sudden changes in water level. Noise and visual intrusion can matter even when machinery does not enter the wetland.

  • Do not walk into an active colony or floating nest area.
  • Keep works outside the active nesting period where practicable.
  • Use a site specific buffer around the colony, set by a qualified ecologist after considering visibility, noise, terrain, wind and the work type.
  • Stop work and seek ecological advice if adults repeatedly flush, mob workers or leave nests unattended.

Colonies and breeding places: Protection of breeding places

Plan clearing, construction, dewatering and high noise activities outside the active breeding period wherever practicable. If works cannot be moved, obtain a site specific assessment and approval before entering or disturbing the breeding place.

Maintain a quiet buffer around active nests and retain the wetland, floating vegetation and access to feeding habitat. Use staged works, low speed access and a fauna spotter catcher or ecologist to monitor bird responses where required.

  • Mark the colony and buffer on plans and in the field.
  • Keep exclusion fencing outside the wetland and away from nest vegetation.
  • Avoid sudden water level changes during nesting.
  • Reassess the buffer if birds show repeated alarm or flushing behaviour.
  • In Queensland, obtain advice on the high risk species management program requirements before tampering with a breeding place of this least concern colonial breeder.

Threats: Clearing and construction

The main worksite risks are disturbance, loss of wetland vegetation and changes to water conditions. Because breeding habitat can be temporary, impacts may be missed if surveys are carried out only when the wetland is dry or birds are absent.

Removing shallow wetland, floating vegetation, reedbeds or marsh margins can remove nests, breeding substrate and feeding habitat. Earthworks, access tracks, drainage and hardstand can fragment wetland habitat or alter how water spreads across the site.

Plan the project footprint to retain suitable wetland vegetation and avoid placing access routes through shallow water, plant beds or colony flight paths.

  • Avoid clearing active or recently used breeding vegetation.
  • Keep stockpiles, spoil and sediment controls out of wetland margins.
  • Use existing disturbed access routes where practicable.
  • Inspect the full wetland complex, not only the construction footprint.

Threats: Disturbance and human access

People, vehicles, boats, drones, dogs and machinery can flush adults from nests. Repeated disturbance may prevent incubation and feeding, and may cause abandonment.

Use a site specific buffer around active colonies. The buffer should reflect the colony layout, line of sight, terrain, noise, wind, machinery and the birds' response. There is no single distance that suits every site.

  • Keep workers and visitors outside the buffer.
  • Use screens or altered work methods where they reduce visual disturbance.
  • Brief all personnel before work starts.
  • Stop and obtain ecological advice if birds repeatedly mob or flush.

Threats: Water level, flow and water quality

Drainage, pumping, dewatering, canalisation, changed flow paths and rapid water level changes can expose nests, flood nests or remove aquatic plants. Poor water quality, pollution, eutrophication and insecticide runoff can reduce prey and wetland condition.

Coordinate water management with the breeding assessment. Retain suitable shallow water and floating or emergent vegetation where practicable, and prevent sediment or contaminated water entering occupied habitat.

  • Monitor water levels during works near an active colony.
  • Avoid sudden drawdown or filling while nests are present.
  • Use sediment and spill controls that protect wetland water quality.
  • Check downstream and connected wetlands for effects.

Threats: Flooding, drought and wetland loss

Flooding can create new breeding habitat, but excessive water or wave action can destroy nests. Drought, drainage, land reclamation and loss of temporary wetlands can remove breeding and feeding opportunities.

Wetland suitability may change quickly, so timing and repeat inspections matter. Protect a network of nearby wetlands where possible, rather than relying on one breeding site.

  • Consider rainfall and flooding forecasts in the work schedule.
  • Retain wetland connectivity and nearby alternative feeding areas.
  • Record colony locations and water conditions for future planning.
  • Review the risk after major weather events or water management changes.

Survey methodology: 1. Desktop assessment

Whiskered Terns can be easy to miss because they forage over open water and may move between wetlands as water levels and vegetation change. Survey the wetland, nearby open water and likely flight paths, with extra care during the breeding period when colonies become highly conspicuous and defensive.

Map shallow freshwater and brackish wetlands, temporary swamps, marshes, floodwaters, large dams, sewage ponds, irrigated areas and other wetlands with floating or emergent vegetation.

Check whether the project may affect a colony, nest site, feeding area, roost, water level, drainage pattern or access route between wetland areas.

Review recent aerial imagery and local bird records. Give extra attention to wetlands that have held water recently, even if they are temporary or partly dry at the time of assessment.

Australian distribution: Mainly across mainland Australia, with breeding mainly south of 25 degrees south. The species is a vagrant in Tasmania.

Foraging distance: Birds may forage up to 9 km from breeding sites, but usually forage within 1 km.

  • Record wetland type, water depth and extent, floating and emergent vegetation, islands, banks and nearby roosting areas.
  • Identify proposed clearing, piling, access, dewatering, pumping, earthworks, lighting and high noise areas.
  • Check relevant Commonwealth, Queensland and other state or territory approval requirements before fieldwork begins.

Survey methodology: 2. Field detection

Search from the wetland edge and from suitable elevated viewpoints where available. Avoid entering floating vegetation or approaching a suspected colony until the site has been assessed from a distance.

Watch for small, tubby terns patrolling back and forth over the wetland, dipping at the surface, hawking insects or occasionally plunge diving. Breeding adults have a black crown, white cheeks, grey body, red bill and red legs.

Listen for hoarse calls such as kerch, kerrrk and kittitt. A colony may mob a predator or person, which can reveal a breeding place but also indicates that the birds are being disturbed.

Colony structure: Colonies are loose. Published colony information includes 10 to 100 pairs, with neighbouring nests 1 to 5 m apart in some populations.

  • Use binoculars or a telescope to inspect vegetation rafts, moored vegetation and shallow water margins.
  • Scan the whole wetland, not just the proposed impact area. Birds may shift between ponds, reservoirs and wetland complexes.
  • Stop the approach if birds begin repeated alarm calling, circling, mobbing or flushing from the same area.

Survey methodology: 3. Timing and repeat visits

Survey during daylight when birds are active. Make observations in calm conditions with good visibility and avoid heavy rain, strong wind, glare and conditions that make flight or calls difficult to detect.

Repeat the inspection when the wetland is likely to be used, especially after rainfall, flooding or changes in water management. One visit may miss a colony because breeding is erratic and birds can change ponds as conditions change.

For breeding risk, survey before works and again as close as practicable to the start of disturbance. Treat September to December as a likely Australian breeding period, while recognising that timing varies with climatic conditions and location.

Breeding period: Breeding is commonly recorded from September to December in Australia, but the season is erratic.

  • Record date, start and finish time, weather, visibility, observer names and survey route.
  • Record the number of adults, juveniles, nests, nest groups, birds carrying vegetation, incubation behaviour, feeding flights and defensive behaviour.
  • Map all observations, including flight direction, roost locations, feeding areas, water level, vegetation and the distance from proposed works.

Survey methodology: 4. Colony and breeding place recognition

Treat a group of floating or moored vegetation rafts as a potential active breeding place until an ecologist confirms otherwise. Nests may be heaps or rough rafts of aquatic vegetation, sometimes over water about 60 to 80 cm deep, or on the bottom in very shallow water.

Look for adults sitting low on nests, carrying vegetation, exchanging calls, feeding young or repeatedly flying to and from one section of vegetation. Eggs and chicks may be difficult to see without close approach, so do not enter the colony to confirm activity.

A colony can include other waterbirds, including Hoary-headed Grebes. Record these species and manage the site as a shared waterbird breeding place.

Nest type: A rough raft or heap of aquatic vegetation, floating or moored.

Colony sensitivity: A whole colony may flush and mob a predator or intruder, including people.

  • Mark the colony location on the site plan without entering it.
  • Use the smallest practical observation footprint and keep people, vehicles, boats, drones and machinery away from the colony.
  • Ask the project ecologist to set a site-specific exclusion buffer. Increase the buffer if birds flush, mob or repeatedly abandon nests.

Before habitat disturbance: 1. Avoidance and project planning

Plan works around the wetland and the birds, rather than relying on rescue after disturbance starts. A breeding colony is a shared breeding place, and losing one site can affect many pairs and other waterbirds using the same wetland.

Redesign access tracks, laydown areas, crossings, pumping points, lighting and work platforms to avoid wetlands, floating vegetation and active colonies.

Keep works outside the active nesting period wherever practicable. For this species, use the local breeding observations rather than relying only on a calendar, because breeding timing is erratic and responds to water conditions.

Do not drain, fill, isolate or rapidly alter a wetland that supports an active colony without ecological and regulatory approval. Water level changes can remove floating vegetation, strand nests or make a site unsuitable.

  • Retain emergent and floating vegetation around suitable wetland habitat.
  • Maintain safe flight paths and avoid placing bright lights toward the wetland at night.
  • Include colony protection, water management and stop-work actions in the environmental management plan.

Before habitat disturbance: 2. Approvals, permits and advice

Have the project ecologist check whether the action may require referral under the Environment Protection and Biodiversity Conservation Act 1999. Do this before clearing, construction or wetland alteration begins.

In Queensland, obtain advice from the Department of the Environment, Tourism, Science and Innovation about the Nature Conservation (Animals) Regulation 2020. Tampering with the breeding place of a least concern colonial breeder requires a high risk species management program, rather than the low risk program used for other least concern animals.

Check state and territory wildlife, vegetation, wetland, waterway and construction requirements. Obtain any required animal handling, relocation, collection or rehabilitation permits before works start.

  • Nominate the approval holder and the person responsible for compliance on site.
  • Keep approvals, permits, the species management program and contact details in the site office and in the spotter catcher vehicle.
  • Do not assume that least concern status removes the need for approval where a breeding place is affected.

Before habitat disturbance: 3. Pre-clearance inspection and exclusion

Complete a pre-clearance inspection immediately before works, and repeat it after rain, flooding or a significant change in water level. Inspect the impact area and the wetland that may be affected by noise, vibration, light, access or water movement.

Have the ecologist mark the active colony, nest groups, feeding routes and any roost on the ground and site plans. Set a no-entry buffer that reflects the colony size, visibility, terrain, machinery and observed flushing distance.

Keep the buffer in place until the ecologist confirms that the breeding place is inactive or the approved management action allows works to proceed.

  • Fence or flag the exclusion area and install signs that state no entry, no vehicles and no equipment storage.
  • Use a spotter catcher or fauna observer to inspect all work fronts before each shift.
  • Do not use drones, boats or personnel to inspect nests from close range unless specifically authorised and assessed as low disturbance.

Before habitat disturbance: 4. Crew induction and work controls

Explain that the colony is a protected breeding place and that birds may defend it by mobbing and striking. Workers must not approach, photograph closely, feed, chase or handle birds.

Brief all staff, contractors and visitors on the colony location, buffer, access route, stop-work signal and injured animal procedure.

Schedule noisy or disruptive tasks away from the wetland where possible. Keep machinery, generators, lighting and vehicle movements outside the approved buffer.

  • Use a map and photographs in the induction rather than relying on verbal directions.
  • Nominate one person to authorise any change to the exclusion zone.
  • Record attendance at the induction and provide a short refresher when the colony location or work crew changes.

During habitat disturbance: 1. Sequential clearing and supervision

Work slowly and in stages. The fauna observer must have authority to stop work immediately if a colony, nest, roost or animal is found, or if birds show repeated disturbance responses.

Clear from the least sensitive area toward the retained wetland, using the smallest work area practicable. Keep the active colony and its buffer undisturbed.

Use a fauna spotter catcher or suitably qualified fauna observer at the work front. Stop before entering vegetation, shallow water, banks or structures that have not been inspected.

Recheck the wetland at the start of each shift, after breaks and whenever water levels, weather or work methods change.

  • Remove loose materials, rubbish and hazards from the work area before machinery arrives.
  • Keep machinery outside the buffer until the observer gives clearance.
  • Use low speed and avoid sudden movements near retained wetland habitat.

During habitat disturbance: 2. If a colony, nest or roost is found

Stop work immediately and withdraw people and equipment without crossing the suspected breeding place. Do not attempt to move a nest, raft, egg, chick or vegetation mat.

Keep the area quiet and prevent further approach. The project ecologist must inspect from a distance, confirm the activity and review the buffer and approval conditions.

If the place is active, leave it undisturbed and revise the work method, timing or footprint. Contact the relevant regulator where the action may breach an approval, permit or Queensland species management program.

  • Mark the location from outside the disturbance area.
  • Record the behaviour that indicated activity, the number of adults and nests, and any signs of chicks or incubation.
  • Do not recommence until the authorised ecologist or approval holder provides written or recorded clearance.

During habitat disturbance: 3. Animal handling and release

Only authorised and appropriately trained people may catch, handle, transport or release a Whiskered Tern. Most healthy birds should be left in place and managed through exclusion and avoidance.

If a bird is grounded, trapped or unable to fly, keep people, dogs and vehicles away. Use a quiet, ventilated container only when directed by the authorised handler, and keep the bird cool, dark and secure.

Do not feed, give water, photograph unnecessarily or release the bird without advice from a wildlife rehabilitator or veterinarian.

  • Contact the project fauna supervisor and the nearest authorised wildlife rehabilitator or veterinarian.
  • Record the exact location, condition, apparent injury, time found and people involved.
  • Follow permit conditions for transport, treatment, release location and reporting.

During habitat disturbance: 4. Records and stop-work reporting

Record every stop-work event, even where no animal is handled. Good records help demonstrate compliance and show whether the work method is causing repeated disturbance.

Use photographs or mapped points only when they can be obtained without entering the buffer or flushing birds.

Escalate repeated flushing, mobbing, nest abandonment, injury or mortality to the project manager and ecologist immediately.

  • Record date, time, location, work activity, weather, species, number of birds, behaviour, action taken and person who authorised recommencement.
  • Update the site map and daily environmental log.
  • Notify regulators, approval holders and rehabilitation providers where required by the approval, permit or management program.

After habitat disturbance: 1. Post-clearance inspection

Close-out checks should confirm that the work area is safe, the retained wetland remains functional and no birds, nests or equipment have been left at risk. Review the response before the next stage of work, especially where water levels or vegetation have changed.

Inspect the cleared area, wetland edge, access route, sediment controls, drainage points and retained vegetation after each work stage.

Check for stranded birds, injured birds, damaged nests, displaced vegetation rafts, entanglement hazards, oil or sediment and changes to water flow.

Keep the colony buffer in place until the ecologist confirms that the site remains suitable and that no new active breeding place has formed in the work area.

  • Search from outside the wetland and avoid flushing birds.
  • Remove temporary hazards only when doing so will not disturb the colony or alter water conditions.
  • Record the condition of the site with mapped points and photographs taken from a safe distance.

After habitat disturbance: 2. Monitoring and follow-up

Monitor an active or recently disturbed colony at a frequency set by the ecologist and approval conditions. Increase checks after flooding, rapid drying, pumping, major noise or a change in water level.

Look for continued attendance, incubation, chick care, feeding flights, fledged young and use of nearby feeding or roosting areas.

If birds leave, determine whether the cause may be disturbance, water management, predation, vegetation loss or another project impact. Do not assume that an empty colony is inactive without considering the timing of the observation.

  • Compare observations with the pre-work baseline.
  • Maintain the buffer if birds continue to use the site or if young remain dependent.
  • Record the outcome of each monitoring visit and any corrective action.

After habitat disturbance: 3. Relocated or recovered animals

Confirm the destination, condition and release outcome of every handled bird through the authorised handler or rehabilitation provider.

Do not return a bird to an active work area. Release only at an approved location with suitable wetland habitat and low immediate disturbance risk.

Where a nest, chick or adult has been moved under an approved action, monitor the original and receiving locations as directed by the ecologist and regulator.

  • Record handler details, permit number, transport time, treatment, release site and release date.
  • Report deaths, failed releases and unexpected species impacts through the required approval pathway.
  • Keep rehabilitation records with the project environmental records.

After habitat disturbance: 4. Incident review and close-out

Review any colony disturbance, nest damage, bird injury, mortality, unauthorised entry or approval breach before the next work stage.

Identify the cause and change the work method, buffer, timing, supervision or induction where needed.

Close out the incident only after the ecologist and project manager confirm that corrective actions are complete.

  • Hold a short review with the spotter catcher, supervisor, machinery operator and ecologist.
  • Update the risk assessment and site environmental plan.
  • Share lessons with the next work crew and retain the incident record for reporting.

Rehabilitation actions: 1. Restore wetland structure

Restoration should recreate a functioning wetland, not just replace a nest. Whiskered Terns need open water with suitable floating or emergent vegetation, feeding habitat and quiet areas where colonies can establish without repeated disturbance.

Retain or reinstate shallow freshwater and brackish wetland areas, temporary pools, marshes and floodwater connections where they formed part of the original habitat.

Restore a mosaic of open water, floating vegetation, emergent vegetation and shallow margins. Avoid making the entire wetland densely vegetated or completely bare.

Manage water levels gradually where practicable. Prevent sudden drainage, excessive drawdown, sediment entry and polluted runoff during establishment.

  • Use local wetland plants suited to the site and expected water regime.
  • Control erosion and stabilise banks without removing useful shallow-water habitat.
  • Keep machinery, stock and public access away from newly restored breeding habitat until vegetation is established.

Rehabilitation actions: 2. Artificial nesting structures

Where natural floating vegetation is limited, consider artificial anchored rafts or similar floating nest platforms. These can suit Whiskered Terns on intensively managed water-bodies when designed and placed by a wetland ecologist.

Position structures in quiet water with adequate surrounding wetland habitat, secure anchoring and protection from wave action, predators, machinery and public access.

Do not install nest boxes, bat boxes, hollow logs, cave structures or generic roost boxes for this species. Whiskered Terns are wetland terns that nest on floating or moored vegetation, not in hollows or caves.

  • Obtain ecological and regulatory approval before installing or moving any nesting structure.
  • Inspect anchors, flotation, vegetation and access risks before the breeding period and after major floods or storms.
  • Treat a structure used by birds as an active breeding place and apply the same buffer and disturbance controls as for a natural colony.

Rehabilitation actions: 3. Water, weeds and habitat protection

Keep water quality suitable for wetland birds. Control sediment, hydrocarbons, concrete washout, litter, pesticides and nutrient runoff.

Remove invasive weeds using methods that avoid the breeding period, active nests and sudden loss of cover. Stage weed control so that birds retain alternative vegetation and open water.

Coordinate pumping, irrigation, drainage and floodplain works with the wetland manager. Water conditions can determine whether floating vegetation and breeding habitat remain available.

  • Use sediment and spill controls before earthworks begin.
  • Avoid herbicide drift onto floating or emergent vegetation and follow all product restrictions.
  • Retain nearby feeding areas because birds may forage up to 9 km from breeding sites, usually within 1 km.

Rehabilitation actions: 4. Lighting, access and long-term monitoring

Use shielded, warm, low-spill lighting and direct it away from wetland water, vegetation and flight paths. Switch off unnecessary lights when work is finished.

Restrict boats, vehicles, dogs, recreation and public access near restored breeding areas. Install signs and fencing where disturbance is likely.

Monitor restored wetlands through at least the first breeding opportunities and after major changes in water level. Check vegetation, water quality, nesting attempts, colony use, fledging and disturbance.

  • Set monitoring triggers for poor water quality, nest loss, repeated flushing, drying, weed spread and structural failure.
  • Compare results with the original habitat assessment and adjust water management or vegetation works.
  • Maintain the site until the restored wetland is functioning and management responsibility has been formally transferred.

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