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Silver Gull (Chroicocephalus novaehollandiae)

The Silver Gull is a common Australian gull of coasts, estuaries, islands, waterways, wetlands and urban areas. It often breeds in colonies on islands and waterfront structures, so clearing, construction, lighting, access and food waste can affect many birds at one site. It is listed as least concern in Australia, but in Queensland a breeding place of this colonial breeder requires a high risk species management program before tampering.

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

Silver Gulls are colonial breeders that may nest from late summer through to summer, with timing varying between regions and colonies. Coastal South Australian breeding is recorded from July to March, while urban colonies may breed for much of the year when food is readily available.

Breeding mode: Colonial breeder. Both adults build the nest, incubate the eggs and feed the young.

Breeding sites: Usually ground nests on offshore or inland islands, rocks, sand, grass, shrubs and wetlands. Artificial sites include jetties, boats, pylons, bridges, hulks, seawalls and other waterfront structures.

Clutch size: Usually 1 to 3 eggs. A range of 2 to 4 eggs is also reported.

Broods: Two broods may be raised in a year. Urban colonies can show extended or almost year-round breeding.

Incubation: Not recorded.

Fledging and dependence: Not recorded. Treat eggs, nestlings and recently fledged young as dependent until they are mobile and regularly leaving the colony.

Colony size and site fidelity: Colonies range from a few nests to many thousands of pairs. Recorded examples include 2 nests at a waterfront site, about 20 pairs at Homebush Bay, and approximately 10,200 breeding pairs on Big Island in 2015. Repeated use of the same islands, structures and waterfront sites is common.

Timing varies between regions and years, and urban colonies with reliable food may nest for longer than less disturbed coastal or inland colonies.

  • Breeding and nesting: Active nests may occur from March to December across Australia, with additional January to March breeding recorded in South Australia and peak activity commonly from August to November.
  • Eggs, nestlings and dependent young: Eggs and young may be present wherever an active colony is found, and the exact exposure period varies between nests and regions.
  • Colonies and communal roosts: Colonies and roosts may occur year round on islands, wetland margins, exposed banks, rocks, structures, boats and other low disturbance sites, with larger concentrations during breeding.
  • Foraging and local movement: Silver Gulls are active throughout the year and move between colonies, roosts, wetlands, beaches, estuaries, fishing areas and human food sources.
  • Highest clearing risk: Schedule clearing and construction outside active nesting where practicable, and use a site-specific buffer around active colonies to prevent flushing, noise, vibration, lighting and repeated access; avoid changing drainage or water levels near wetland colonies.

Identification: Appearance

Silver Gulls are familiar, medium sized gulls with pale bodies, grey wings and black wing tips. They are often noisy and occur in groups, especially around water, food waste and breeding sites.

Adults have a white head, body and tail, a light grey back and wings, and black tipped wings with white markings. The bill, legs and eye ring are usually red, orange red or orange yellow, with regional variation.

Juveniles are browner and more mottled. They have a dark bill, dark legs and brown markings on the wings. Adult plumage is reached at about 10 months.

Body length: About 40 to 45 cm.

Adult bill: Usually red or orange red.

Adult legs: Usually red, orange red or orange yellow.

Identification: Calls and similar species

The common call is a harsh, loud kwee-aarr. Expect repeated calling and alarm calls when people, dogs, vehicles, boats or aircraft approach a colony.

Pacific Gulls are much larger and more robust. Kelp Gulls may also occur in coastal areas. Juvenile Silver Gulls can be confused with other brown gulls, so check the smaller size, pale body and developing red bill.

  • Use several features together, including size, bill colour, leg colour, wing pattern and behaviour.
  • Do not rely on the common name seagull for identification.

Identification: Field signs

Look for shallow nest scrapes lined with seaweed, roots, grass or other plant material. Nests may be on bare ground, rock, sand, grass, low shrubs, jetties, boats, buildings, barges and other waterfront structures.

Droppings and whitewash may build up on rocks, ledges, boats, moorings, signs and access tracks. Feathers, eggshells, food remains and repeated alarm calls can indicate a nearby colony.

  • Adult birds repeatedly carrying nesting material.
  • Adults sitting low on nests or standing guard.
  • Chicks sheltering under vegetation, rocks or structures.
  • Aggressive swooping, mobbing or concentrated calling when observers approach.

Distribution: Australian range

Silver Gulls occur across Australia and are especially common near the coast. They also use inland waterways, wetlands, rivers, reservoirs, agricultural areas and urban sites.

The species is mapped in New South Wales, the Northern Territory, Queensland, South Australia, Tasmania, Victoria and Western Australia. It occurs around the Australian coastline and offshore islands, and extends inland along rivers, lakes, marshes, reservoirs and waterways.

Large breeding colonies are known from offshore islands, estuaries, inland islands and artificial waterfront structures. Important examples include the Five Islands Group and Sydney Harbour in New South Wales, Western Port Bay and Mud Island in Victoria, the Capricorn and Bunker island group in Queensland, and island and wetland sites elsewhere in Australia.

Distribution: Overseas range and movement

Silver Gulls also occur in New Zealand, New Caledonia and the Loyalty Islands. The Australian population includes regional forms, with northern birds differing from many southern birds in wing pattern.

Local movements can be extensive. Birds may leave colonies after breeding and travel to waste facilities, fishing areas, beaches, estuaries, reservoirs and inland towns. Daily movements of 25 to 50 km between coastal islands and inland waste depots have been recorded near Melbourne.

Distribution: Site assessment

During a fauna inspection, search both the proposed work area and nearby water. Check islands, shoreline structures, boats, bridges, jetties, pylons, seawalls, docks, moorings, landfill areas and wetland margins.

A colony may be outside the project footprint while its birds use the footprint for feeding, loafing or commuting. Record flight paths, regular roosts, feeding areas and any concentrated use of refuse or water treatment facilities.

Habitat: Natural habitats

Silver Gulls use a wide range of coastal, estuarine, inland and modified habitats. They are particularly successful where open ground, safe nesting sites and reliable food occur together.

Search coastal islands, beaches, sandbanks, mudbanks, spits, rocky shores, estuaries, sheltered embayments and shallow coastal waters. Inland sites may include lakes, rivers, reservoirs, marshes, floodwaters, salt lakes and terrestrial wetlands.

Breeding sites can occur on offshore islands and inland wetlands. Open ground with low vegetation is often suitable, especially where access by people, dogs and predators is limited.

  • Sandy and rocky islands.
  • Exposed sandbanks and mudbanks.
  • Wetland margins and dry ground above high water.
  • Low shrubs, grass and sparse coastal vegetation.
  • Riverbanks, lake islands and reservoir edges.

Habitat: Modified and urban habitats

Silver Gulls readily use modified shorelines and infrastructure. They may nest or roost on barges, disused wharves, pylons, swing bridges, seawalls, riprap, mooring structures, boats, docks and industrial islands.

Urban colonies may occur close to restaurants, shopping centres, landfill, sewage facilities, ports, airports, schools, parks and recreational areas. Human food waste can support high numbers and extended breeding.

  • Check roofs and elevated structures where gulls are already landing or nesting, while confirming use on site.
  • Inspect quiet corners of working ports, marinas and industrial islands, not only natural vegetation.
  • Treat food waste areas and standing water as part of the habitat assessment.

Habitat: Water and site condition

Silver Gulls use shallow water, wet mud, exposed intertidal areas and floodwaters for feeding and loafing. Reservoir drawdown can expose muddy shorelines that attract birds.

Water levels, flooding, drainage and construction dewatering can alter access to feeding and roosting areas. Changes may also concentrate birds into smaller areas, increasing disturbance and conflict.

Foraging habitat: Natural feeding areas

The Silver Gull is an opportunistic generalist. On works sites, feeding activity may be more obvious than nesting activity, but repeated feeding and commuting can still indicate a nearby breeding or roosting place.

Look for birds on sandy beaches, mudflats, exposed reefs, wet sand, shallow water and the margins of wetlands. They also forage around breakers, inshore waters, salt lakes and floodwaters.

They feed on the ground, at the water surface and in shallow water. Feeding methods include dipping, skimming, surface feeding, foot paddling, hawking and short dives.

  • Intertidal flats exposed around low tide.
  • Wet mud and moist sand after waves recede.
  • Shallow water less than 5 cm deep.
  • Reefs, sandbanks and floodwater edges.
  • Salt lakes where brine shrimp are available.

Foraging habitat: Food and behaviour

The diet includes worms, insects, fish, crustaceans, carrion, plant material, eggs and young birds. Silver Gulls also scavenge human refuse and may take food from fishing boats, parks, beaches, landfill and food processing areas.

They may forage alone or in groups. They can steal food from other birds and may hunt cooperatively over water. Feeding by people can increase local numbers and encourage birds to remain near developed areas.

  • Keep bins closed and remove food scraps from work compounds.
  • Do not feed gulls or leave catering waste accessible.
  • Manage food waste at the whole site, including laydown areas, lunch areas and temporary facilities.

Foraging habitat: Works site indicators

Regular gull flights between a colony and a work area suggest that the site supports a breeding population. Repeated use of one shoreline, stockpile, roof, jetty or waste area should be mapped before works begin.

Count or estimate birds consistently where practical, and record time, tide, weather, water level and nearby food sources. Counts can vary with rainfall, food supply, disturbance and daily movement.

Breeding habitat: Nest places

Silver Gulls usually breed in colonies, often on islands or other sites with limited access. Nests may be on the ground or on built structures, including places that appear unsuitable until birds begin nesting.

Nests are shallow scrapes lined with seaweed, roots, grass and plant stems. They may occur among rocks, on sand, in grass or low shrubs, and on bare ground near water.

Artificial breeding places include jetties, boats, barges, pylons, seawalls, docks, mooring structures, bridges and industrial islands. A small number of nests can occur on a structure that also supports a much larger roost.

  • Inspect islands and quiet shoreline corners from a distance before landing or entering.
  • Check floating and moored structures, not only land.
  • Search low vegetation and rock cover for eggs and chicks.
  • Treat repeated adult attendance as a possible breeding place even before nests are visible.

Breeding habitat: Breeding period

Breeding timing varies between regions and sites. Coastal South Australian breeding has been recorded from July to March, while other Australian accounts describe breeding from March to November or August to December.

Urban colonies may breed for much of the year where food is reliable. Plan pre clearance checks close to the start of works and repeat them if works extend across seasons.

Breeding habitat: Active breeding signs

An active breeding place may have adults sitting tightly on nests, carrying vegetation, defending a small area, or repeatedly returning to the same point. Eggs, downy chicks, unattended chicks, eggshells and fresh nest material are strong indicators.

Adults may mob observers, boats, drones, dogs or machinery. A sudden increase in calling and birds circling or landing repeatedly can indicate that a nest or colony is being approached.

  • Stop and reassess if eggs or chicks are found.
  • Mark the location without entering the colony.
  • Use a qualified ecologist to set the work boundary and management response.
  • Do not move nests, eggs or chicks unless authorised under the relevant approval.

Sheltering habitat: Roost and loaf sites

Silver Gulls roost and loaf in open places with good visibility and quick access to water or food. Roosts may be separate from the breeding colony and can change with tide, water level, weather and disturbance.

Common places include sandy beaches, mudflats, exposed sandbanks and mudbanks, spits, wetland margins, floodwaters, dry ground and shallow water. Reservoir shorelines and islands may be used for bathing, preening and resting.

In developed areas, look on roofs, seawalls, jetties, boats, barges, pylons, mooring dolphins, docks, bridges and other elevated or open structures.

Sheltering habitat: How to recognise regular use

Regular roosts often have concentrated whitewash, feathers, footprints, resting birds and repeated use of the same exposed surface. Birds may gather before and after feeding or around low tide.

A roost can be valuable even when no nests are present. Avoid assuming that a quiet site is unused if birds are absent during one visit.

  • Inspect at different times of day where practicable.
  • Consider tide, rainfall, flooding, water level and nearby food sources.
  • Map flight paths between roosts, feeding areas and colonies.

Sheltering habitat: Shelter and disturbance response

Silver Gulls need clear escape routes and resting areas. People, dogs, boats, vehicles, drones, lights and machinery can cause repeated flushing, especially when birds are resting or breeding.

There is no single distance that suits every site. Set a site specific buffer based on bird behaviour, visibility, terrain, colony size and the type of work. Increase the buffer if birds flush, circle repeatedly or stop returning.

  • Keep works outside the nesting period where practicable.
  • Use visual screens and low noise methods where they reduce disturbance.
  • Keep workers, plant, vehicles, boats and dogs out of roosts and colony areas.
  • Do not use drones over active colonies.

Colonies and breeding places: What colonies look like

A Silver Gull colony is a concentrated breeding place where many pairs nest close together. Colonies may occupy a natural island, a wetland feature or a small part of a built structure, and one colony can hold a large share of the local breeding population.

Colonies range from a few nests on a hulk, dock or bridge to hundreds or thousands of breeding pairs on an island. Recorded examples include about 20 nesting pairs at Homebush Bay, 209 nests on Snapper Island, more than 1,000 pairs at Moon Island, and about 10,200 breeding pairs on Big Island in 2015.

Large colonies have dense groups of adults, repeated alarm calls, whitewash, nest scrapes and many chicks. Nests may be spread through low vegetation or concentrated on separate parts of an island or structure.

Small colony example: About 20 nesting pairs at Homebush Bay.

Large colony examples: At least 1,000 pairs at Moon Island and about 10,200 pairs on Big Island in 2015.

Structure colonies: Some sites support only a few nests, while others support hundreds of nests.

Colonies and breeding places: Colony locations and nest density

Check offshore and inland islands, wetland trees where available, low shrubs, grass, lignum, reedbeds, sandbanks, riverbanks, cliffs, culverts, bridges, caves, jetties, pylons, seawalls, boats, barges, docks and other sheltered structures. Silver Gulls most often use open ground, rock, sand, grass and low shrubs, but built structures can also become breeding places.

Nest density is often highest where food is nearby and access is difficult. Dense nesting increases the risk that one disturbance event will flush many adults and expose eggs or chicks.

  • Search natural islands and elevated or floating structures.
  • Inspect reedbeds, lignum and wetland margins where gulls are using inland water.
  • Check bridge undersides, culverts and other sheltered structures before access or demolition.
  • Use binoculars or a scope from outside the likely colony edge.

Colonies and breeding places: Site fidelity and active colonies

Silver Gulls can return to established breeding sites over many years. In Port Jackson, Cockatoo Island and Me-Mel were used consistently from 2003, while other colonies shifted between structures and islands. In South Australia, fewer than half of birds that later bred were recorded at their natal colony, so local site fidelity does not mean every bird returns to its birth site.

An active colony is indicated by occupied nests, eggs, chicks, adults carrying material, adults defending nest areas, fresh whitewash and repeated alarm calls. Mark the outer edge and any access route without walking through the colony.

  • Complete a pre works inspection before clearing, demolition, pile driving, dredging or access changes.
  • Repeat the inspection if works are delayed or if the breeding season overlaps the program.
  • Treat a colony as active until a suitably qualified person confirms that nesting has finished.
  • Keep works outside the nesting period where practicable.

Colonies and breeding places: Buffers, flushing and water management

A fixed disturbance distance is not suitable for every colony. Use a precautionary, site specific buffer around active nests and the wider colony, then adjust it only when birds remain settled and continue normal incubation and feeding. Increase the buffer when adults flush, circle, mob workers or fail to return.

Where waterbird colonies use islands, wetlands, reedbeds, sandbanks or river margins, avoid sudden changes in water level, flooding, drainage, pumping or access. Coordinate water management with the breeding season and maintain safe access to nests without creating new predator or public access routes.

  • Keep plant, vehicles, boats, people, dogs and drones outside the buffer.
  • Avoid sudden lighting, noise, vibration and shoreline access near active colonies.
  • Use spotters and staged works where activity must occur near a colony.
  • In Queensland, arrange the required high risk species management program before tampering with the breeding place of this least concern colonial breeder.

Colonies and breeding places: Why colonies need special care

A single colony can contain a large share of the local population. Flushing many adults at once can expose eggs and chicks to heat, predators and other gulls, and can interrupt incubation and feeding.

Colonies may also be on sites that are needed for construction, maintenance, dredging, access, flood management or public safety. Early mapping allows the project to avoid the colony, stage the work, maintain a buffer and manage food and water attractants.

  • Plan around the colony rather than relying on deterrence after nesting begins.
  • Do not clear vegetation, remove structures or disturb nests without the required approvals.
  • Record colony size, nest locations, access routes, disturbance responses and the final management measures.

Threats: Clearing and construction

Silver Gulls are adaptable, but breeding places and roosts can be disrupted quickly by development and land management. The main site risks are disturbance, loss of nesting space, altered water conditions and access to human food waste.

Clearing low vegetation, removing rock or sand, demolishing waterfront structures and changing shorelines can destroy nests or remove an established breeding place. Works near islands, docks, bridges, culverts, pylons, boats and seawalls need a breeding place check before commencement.

Pile driving, demolition, dredging, blasting, high pressure washing, vehicle movements and night lighting can cause repeated flushing or abandonment.

  • Complete a pre works fauna inspection.
  • Avoid active colonies and roosts in the design where possible.
  • Stage noisy or high vibration work outside the nesting period.
  • Use a qualified fauna spotter catcher and ecologist when work is near an active colony.

Threats: Disturbance and flushing

People, dogs, boats, drones, aircraft, vehicles, machinery and sudden lights can flush adults from nests. Repeated disturbance can leave eggs and chicks exposed and can cause birds to move to less suitable sites.

The response distance varies with terrain, visibility, colony history and the activity. Monitor behaviour rather than relying on an arbitrary separation distance.

  • Stop work if birds flush repeatedly or do not return promptly.
  • Increase the buffer and reduce noise, movement and visibility.
  • Keep public and worker access out of the colony.
  • Use signs, fencing or a spotter to maintain the exclusion area.

Threats: Food waste, disease and wildlife conflict

Open bins, food scraps, landfill, sewage facilities and feeding by people can increase gull numbers and encourage breeding near works. Artificially high numbers can increase fouling, noise, aircraft risk, disease risk and predation on eggs and young of other birds.

Silver Gulls can carry Salmonella species. Faecal contamination can affect people, water, equipment and work areas.

  • Use lidded bins and remove food waste regularly.
  • Do not feed gulls from the work site.
  • Keep food preparation, storage and lunch areas clean.
  • Manage attractants across the wider site, not only inside the construction compound.

Threats: Water management and loss of refuge

Drainage, dewatering, flooding, reservoir drawdown and changes to tidal or wetland conditions can remove feeding and roosting areas or concentrate birds into a smaller area. Sudden changes near an island or wetland colony can affect access to nests and increase exposure to predators and people.

Include nearby water levels, flood paths, exposed mud, shallow water and alternative roosts in the works assessment.

  • Plan pumping, drainage and water level changes outside the breeding period where practicable.
  • Keep an escape route and suitable resting areas available.
  • Inspect after floods, drawdown, storms or major changes in shoreline condition.
  • Review the management plan if birds relocate, concentrate or begin nesting in a new structure.

Survey methodology: 1. Desktop assessment

Silver Gulls are conspicuous, mobile and often associated with open water, islands, waterfront structures and human food sources. Surveys should cover both the work area and nearby breeding, roosting and loafing sites because birds may commute between them.

Review recent aerial imagery, local records, landholder information and site history before planning fieldwork.

Map islands, sandbanks, mudflats, wetland margins, riverbanks, offshore structures, jetties, bridges, pylons, boats, barges, seawalls, rooftops and other structures that could support nests or roosting birds.

Identify nearby waste facilities, fishing areas, sewage outfalls, beaches, reservoirs and other regular feeding sites. These locations can attract birds from colonies some distance away.

Typical breeding habitat: Offshore and inland islands, coastal and inland wetlands, artificial structures, jetties, boats, pylons, seawalls, hulks and other waterfront structures.

Reported breeding periods: Breeding has been recorded from March to November, July to March in coastal South Australia, and commonly August to December. Urban colonies may breed for much of the year.

  • Check whether the site is in or near a known colony, shared roost or repeatedly used breeding place.
  • Review the proposed clearing, demolition, lighting, piling, boating and water management activities.
  • Check current state and territory requirements, including Queensland requirements for tampering with a breeding place of a least concern colonial breeder.

Survey methodology: 2. Field detection survey

Survey from vantage points that provide a clear view without entering a suspected colony. Use binoculars and a telescope where needed.

Walk or slowly scan the work area, nearby shoreline and structures. Inspect ground cover, low shrubs, rocks, sand, grass, vegetation piles, ledges and sheltered corners for nests, eggs and chicks.

Use boat based observations where a colony is on an island or offshore structure. Keep the boat slow and distant enough to avoid flushing birds.

Roost and loafing habitat: Sandy beaches, mudflats, exposed sandbanks and mudbanks, spits, wetland margins, floodwaters, dry ground and shallow water.

Foraging depth: Silver Gulls commonly use shallow water less than 5 cm deep and may dive to about 30 cm.

  • Survey during daylight when birds are active. Include the early morning or late afternoon where roost use, commuting and colony activity need to be confirmed.
  • Repeat observations where birds are mobile, the colony is large, access is restricted or weather and tides limit visibility.
  • Do not enter an active colony merely to improve the count. Use photographs, mapped viewpoints and conservative estimates instead.

Survey methodology: 3. Survey effort and conditions

Match survey effort to the risk of the activity. A small isolated work area may need a structured inspection and repeat visit. A waterfront project near a colony needs wider observations and repeated checks through the breeding period.

Avoid relying on a single count. Gull numbers vary with tide, weather, rainfall, food supply, disturbance and daily movement.

Record conditions that could affect detection, including tide, wind, rain, glare, water level, visibility, boating activity and nearby food sources.

Useful count unit: Record adults, immatures, chicks, eggs, nests and breeding pairs separately where possible.

  • Pause or repeat the survey if birds are repeatedly flushing, visibility is poor or the survey itself is changing bird behaviour.
  • Survey at different times where birds may commute between a breeding place and feeding or roosting areas.
  • Use remote cameras or fixed observation points where access would disturb the colony.

Survey methodology: 4. Records and mapping

Map each nest, nest cluster, colony boundary, roost, access route and proposed disturbance area. Record coordinates or a clear site reference.

Photograph the site from outside the disturbance area. Photograph representative nests and structures without handling eggs, chicks or nesting material.

Describe whether birds are incubating, brooding, feeding chicks, defending nests, carrying nesting material or repeatedly returning to a location.

  • Record the date, time, observer, survey method, duration, weather, tide or water level and disturbance sources.
  • Record signs of flushing, including the number of birds leaving, whether eggs or chicks were exposed, and the time taken for birds to return.
  • Give the project manager and spotter catcher a map showing no entry areas, access routes and observation points.

Before habitat disturbance: 1. Avoidance and approvals

Plan works to avoid active colonies, breeding places and regularly used roosts. Silver Gulls can nest on natural ground and on modified waterfront structures, and urban colonies may remain active outside a simple seasonal window.

Redesign the work where practicable to retain the colony, nest area, roost and access to nearby feeding habitat.

Obtain approvals before clearing, demolition, vegetation removal, structure removal, water level changes or other activity that may affect a breeding place.

Consider an EPBC Act referral if the action may significantly affect a matter of national environmental significance. Obtain all relevant state or territory permits and approvals.

In Queensland, treat Silver Gull as a least concern colonial breeder. Tampering with its breeding place requires the high risk species management program pathway under the Nature Conservation (Animals) Regulation 2020, where that regulation applies. Use the approved program and follow any conditions.

  • Confirm responsibility for permits, fauna supervision, colony protection and stop work decisions.
  • Do not assume that least concern status removes the need for approval or site management.
  • Use a qualified ecologist to confirm whether a location is an active breeding place, colony or shared roost.

Before habitat disturbance: 2. Timing and buffers

Schedule ground disturbance, demolition and high noise activities outside the local nesting period where practicable. Use local records and repeat surveys because Silver Gulls can breed for extended periods in urban environments.

Establish a no entry buffer around every active colony, nest cluster and regularly used roost. Set the distance from observed bird response, visibility, noise, access routes, plant type and the sensitivity of eggs and chicks.

There is no single reliable buffer for every Silver Gull colony. Increase the buffer until birds remain settled and do not repeatedly flush.

Breeding periods recorded: March to November, July to March in coastal South Australia, and commonly August to December. Urban colonies may remain active for much of the year.

  • Keep works outside the nesting period where a local nesting period is known.
  • Use physical fencing, bunting, signs and a map to mark the exclusion area before plant arrives.
  • Keep people, vehicles, boats, drones, dogs, lights and machinery outside the buffer.
  • Review the buffer after rain, flooding, water level changes, new nesting activity or a change in work method.

Before habitat disturbance: 3. Pre clearance survey

Complete a pre clearance inspection shortly before works begin. Inspect all ground, low vegetation, rocks, sand, structures, boats, ledges, jetties, barges, pylons, seawalls and concealed corners within the work area.

Search for shallow nest scrapes lined with vegetation, eggs, chicks, adults sitting tightly, adults carrying nesting material and repeated defensive behaviour.

Have the ecologist confirm that the work area is clear, or mark the active breeding place and revise the work plan.

  • Inspect again after any delay that could allow birds to establish nests.
  • Use a boat or elevated viewing point for offshore or elevated structures.
  • Do not enter a colony to conduct a routine pre clearance search if remote observation can answer the question safely.

Before habitat disturbance: 4. Exclusion and induction

Install exclusion fencing and signs before clearing or demolition. Protect shoreline access, shallow water, roosting banks and flight paths used to reach the colony.

Induct all workers, contractors, boat operators and visitors before work starts.

Explain that eggs, chicks and nests must not be touched, moved, oiled, pricked or destroyed unless a specific authorised program permits the action.

  • Show workers photographs or maps of the colony and exclusion areas.
  • State who can stop work and who can authorise any restart.
  • Prohibit feeding gulls and require secure bins, covered food waste and prompt removal of food scraps.
  • Control night lighting, glare, noise and unnecessary vessel movements near the colony.

During habitat disturbance: 1. Sequential clearing

Use a staged work method and keep a fauna spotter catcher or suitably authorised fauna professional in control of fauna risks. Stop work whenever the planned activity could affect a nest, colony, roost or animal.

Clear in small, defined stages from the least sensitive edge towards retained habitat, while maintaining the colony exclusion area.

Inspect each stage immediately before disturbance. Check the ground, shrubs, rocks, structures, vessels, ledges, plant and debris for nests, eggs, chicks and injured birds.

Keep escape routes open and avoid trapping birds between fencing, buildings, machinery and water.

  • Remove food waste and other attractants before and during works.
  • Stop if birds begin repeated alarm calling, circling, crowding or flushing from nests.
  • Do not use a method that drives birds into water, traffic, machinery or another colony.

During habitat disturbance: 2. Stop work and authority

Give the spotter catcher or fauna ecologist authority to stop work immediately. The authority must apply to all contractors and subcontractors.

Stop work if an active nest, egg, chick, colony, shared roost, injured bird or previously unidentified breeding place is found.

Keep people and machinery still, withdraw to the agreed safe location and prevent further disturbance while the fauna professional assesses the site.

  • Record the location and condition of the animal or breeding place.
  • Re establish the exclusion buffer and update the site map.
  • Do not restart until the fauna professional and project manager confirm that the revised method complies with approvals and permits.

During habitat disturbance: 3. Handling and breeding places

Only an authorised and appropriately trained person may capture, handle, contain, transport or release a Silver Gull.

Do not handle adults, eggs or chicks as a routine control measure. Do not move a nest or colony without specific approval and a documented method.

If an active breeding place is within the work area, redesign the activity or protect the place under the approved management program and permit conditions.

  • Keep observers outside the buffer while the decision is made.
  • Use a suitable, ventilated container only when handling is necessary for welfare, safety or an approved management action.
  • Do not separate a chick from its parents unless the fauna professional confirms that it is injured, orphaned or at immediate risk.
  • Never attempt to relocate a colony to a nest box or artificial structure as an unapproved substitute.

During habitat disturbance: 4. Injured animal pathway

Contact the nominated wildlife carer, veterinarian, wildlife hospital or government wildlife authority as soon as an injured bird is found.

Keep the bird quiet, shaded and away from people, dogs and machinery while awaiting instructions. Do not offer food or water unless directed by a wildlife professional.

Use gloves and hygiene controls when contact with faeces or a bird is unavoidable.

  • Record the finder, time, location, apparent injury, photographs, actions taken and receiving facility.
  • Do not release an injured bird at the work front or into an active colony without professional advice.
  • Report any collision, crushing, electrocution, chemical exposure or other incident under the project approval and incident procedure.

During habitat disturbance: 5. Daily records

Maintain a daily fauna log for the duration of disturbance. Record inspections, bird numbers, nests, chicks, flush events, stop work events and decisions.

Keep copies of permit conditions, inductions, maps, photographs, wildlife transfer records and correspondence with authorities.

  • Record plant type, activity, work area, start and finish time and the supervising fauna professional.
  • Record any change in water level, flooding, tide, lighting, noise, food waste or access that affects the site.
  • Escalate repeated flushing, colony expansion or breeding in a new location to the project ecologist.

After habitat disturbance: 1. Post clearance checks

Complete a formal post clearance inspection before releasing the site from fauna controls. Check retained habitat and nearby structures because Silver Gulls may return quickly or establish nests after disturbance.

Inspect the completed work area, exclusion boundary, retained vegetation, shoreline, structures and nearby roosts after each disturbance stage.

Search for injured or trapped birds, abandoned eggs, chicks, damaged nests, entanglement hazards, loose wire, open pits and access to contaminated water.

Confirm that fencing, covers, netting and other temporary controls are secure and are not trapping birds.

  • Complete a final inspection at the end of each workday where pits, open structures, water hazards or demolition areas remain.
  • Repeat the inspection after storms, flooding, high winds, water level changes or extended work stoppages.
  • Remove temporary controls only when the fauna professional confirms that they are no longer needed.

After habitat disturbance: 2. Monitoring and reporting

Monitor retained colonies, roosts and replacement habitat at a frequency set by the approval and risk assessment. Use the same observation points and counting method where possible.

Compare adult, nest, egg, chick and roost counts with baseline observations. Record changes in site use, flushing, breeding success and nearby food sources.

  • Report approval breaches, injured animals, nest damage, unauthorised entry and repeated disturbance promptly.
  • Provide the regulator or approval holder with required fauna records and monitoring reports.
  • Retain maps, photographs, count sheets, weather and tide information with the project environmental record.

After habitat disturbance: 3. Relocated or treated animals

Confirm the destination, condition and outcome for every animal that was captured, treated, transported or released.

Obtain the wildlife professional's advice before release. Release only where the site is safe, lawful and suitable for the bird's welfare.

Where a chick has been separated from its parents, investigate reunification before considering hand raising or relocation.

  • Record any identification mark, band, photograph, receiving facility, treatment and release location.
  • Do not release a bird into an active work area, a road corridor, a contaminated site or an unsuitable colony.
  • Follow all permit, wildlife rehabilitation and transport requirements.

After habitat disturbance: 4. Incident review

Review every stop work event, injury, nest impact, repeated flushing event and unplanned colony response before the next work stage.

Update the risk assessment, work method, buffer, induction and emergency contacts where the review identifies a weakness.

  • Involve the spotter catcher, fauna ecologist, supervisor and relevant contractor in the review.
  • Share practical lessons with the next crew before work resumes.
  • Close out corrective actions and retain evidence of completion.

Rehabilitation actions: 1. Restore habitat and access

Rehabilitate disturbed areas so they continue to provide safe feeding, roosting and, where suitable, nesting habitat. Silver Gulls readily use modified sites, but restoration should not create new conflicts with aircraft, people, waste facilities or other breeding wildlife.

Reinstate stable ground, natural shoreline contours, islands, sandbanks, mudflats, wetland margins and low vegetation where these features formed part of the site.

Remove construction debris, wire, netting, oil, concrete fragments and other entanglement or ingestion hazards.

Retain suitable open areas and low cover where approved, while preventing unsafe access to roads, machinery, contaminated land and active work zones.

  • Use local materials and native vegetation suited to the site and water regime.
  • Protect restored areas from vehicles, dogs, uncontrolled public access and unnecessary vessel traffic.
  • Do not create nesting habitat in aircraft approach paths, on operational plant, near food handling areas or where gulls would threaten another protected colony.

Rehabilitation actions: 2. Water and food management

Maintain the water depth, shoreline condition and inundation pattern required by the approved rehabilitation design. Account for flooding, rainfall, inflows and water level changes when planning monitoring.

Prevent avoidable food subsidies. Secure bins, remove food scraps and manage waste, sewage, fishing waste and other attractants in accordance with the site plan.

Avoid sudden water level changes that strand chicks, remove roosting banks or expose contaminated sediment.

  • Inspect drainage channels, ponds and shallow water for entrapment hazards.
  • Keep restored water free of rubbish, oil and other pollutants.
  • Coordinate water management with the wetland manager and the fauna ecologist where a colony or shared roost is nearby.

Rehabilitation actions: 3. Artificial nest and roost structures

Use artificial nest sites, platforms or roost structures only where they suit the local species, approval conditions and long term management capacity.

For Silver Gulls, consider open platforms, protected ledges or other site specific structures rather than nest boxes designed for hollow nesting birds.

Do not install bat boxes or enclosed nest boxes as a substitute for gull habitat. Silver Gulls nest on or near the ground and on open natural or built structures.

  • Design structures to prevent entanglement, collapse, overheating, flooding and access by predators where relevant.
  • Place replacement structures away from roads, aircraft hazards, public conflict areas and infrastructure that will later be removed.
  • Obtain ecological and regulatory approval before encouraging a new breeding place.
  • Inspect artificial structures for occupation, nest material, eggs, chicks, damage and maintenance needs.

Rehabilitation actions: 4. Weed and vegetation control

Control weeds that reduce suitable open nesting or roosting ground, block shoreline access or create entanglement hazards.

Retain approved low vegetation and native ground cover that can support shallow nest scrapes and shelter without concealing hazards.

Carry out weed control outside active nesting areas where practicable, and inspect the work area before machinery enters.

  • Remove weeds by methods that do not disturb nests, eggs or chicks.
  • Do not clear all cover from a colony without an approved replacement design.
  • Prevent new weed invasion through clean machinery, follow up inspections and early treatment.

Rehabilitation actions: 5. Long term monitoring

Monitor restored habitat through at least the establishment period and longer where approval conditions require it. Use repeatable photo points and counts.

Track colony presence, nest numbers, chicks, roost use, flushing, weed cover, water condition, artificial structure condition and conflicts with people or infrastructure.

  • Monitor before and during the local breeding period, and repeat during periods when flooding or water management may change habitat.
  • Review the design if birds repeatedly abandon nests, flush, collide with structures or move into unsafe areas.
  • Use monitoring results to adjust vegetation, water, lighting, access, waste controls and future construction methods.

Sources