Fauna Spotters logo

Sooty Owl (Tyto tenebricosa)

The Sooty Owl is a medium-sized, dark forest owl of coastal eastern Australia, including Queensland, New South Wales and Victoria. It depends on large, connected areas of wet forest, old trees with hollows and abundant mammal prey, so clearing, road construction, fire and disturbance around gullies can affect both adults and breeding sites.

Conservation status

New South Wales, Biodiversity Conservation Act 2016: Vulnerable.

Victoria, Flora and Fauna Guarantee Act 1988: Endangered.

Breeding season

Timing varies between regions. The clearest published pattern is winter breeding in Queensland, with courtship in March and April, incubation in June and July and nestlings recorded until October. The table uses this pattern together with the broader autumn to winter or spring breeding period reported for NSW.

Breeding timing is variable across the range. Confirm local breeding activity before clearing, construction, fire or other disturbance, rather than relying only on the general calendar.

  • Courtship and territory defence: Courtship is reported mainly in March and April in Queensland. Pairs are territorial and defend nesting territories within larger home ranges.
  • Laying and incubation: Eggs may be laid from autumn to winter or in spring. Queensland records place incubation mainly in June and July and report an incubation period of about 5 to 6 weeks.
  • Nestlings and dependent young: Nestlings may remain in or around the nest until October in Queensland. Young remain near the nest and dependent on adults for several months, with post-fledging dependence lasting up to 5 months.
  • Resident movement and dispersal: The species is generally sedentary and strongly territorial. Dispersal of up to 50 km has been recorded, including across partly cleared areas, but no seasonal migration is described.
  • Highest clearing risk: Clearing and high disturbance are most likely to harm the species during courtship, incubation, nesting and the period when fledged young remain dependent. The broad risk period is approximately March to November, with highest risk from June to October.

Identification

The Sooty Owl is a thick-set, dark grey owl with a rounded heart-shaped facial disc and large black eyes. It is most likely to be detected by its call, pellets or a nest or roost in a large hollow, rather than by a daytime sighting.

Adults are dark sooty grey above, with fine white spotting on the upperparts and breast, and fine grey barring on the pale belly and feathered legs.

The facial disc is rounded and heavily rimmed, with a grey disc that is darkest around the eyes. The feet and legs are heavily feathered, and the wings are broadly rounded.

Females are much larger than males, particularly in the feet, bill and body weight.

Adult length: 33 to 43 cm

Weight: Not stated in the supplied documents

Sex differences: Females are substantially larger than males

Identification: Distinguishing features

The Sooty Owl is greyer and generally darker than the dark form of the Masked Owl. Its prominent, rounded heart-shaped facial disc, black eyes and feathered feet are useful identification features.

The typical call is a long descending scream or whistle, described as shriller than the scream of the Barking Owl. Other calls include a harsh screech, prolonged grating sounds and rattling trills.

Identification: Field signs

Look for large owl pellets beneath regular roosts, nest hollows or cave entrances, although the supplied documents do not provide pellet dimensions or a diagnostic description.

Nest sites are usually large hollows in tall emergent trees, often smooth gums or other eucalypts, but caves may also be used. Roosts may occur in hollows, caves, cliff ledges, rock crevices, overhangs, tree ferns or dense vine tangles.

The supplied documents do not provide diagnostic tracks, scat measurements, eyeshine characteristics or a specified survey distance for call playback.

  • Inspect large old trees in gullies for suitable hollows, especially hollows more than 30 cm wide and up to 10 m deep.
  • Check cave entrances, rock ledges, dense rainforest vegetation, tree fern stands and vine tangles for roosting birds or pellets.
  • Treat a repeated call response, fresh pellets or a bird entering a hollow as evidence requiring protection and follow-up by a suitably qualified ecologist.

Distribution: National range

The Australian subspecies occurs along the coastal and near-coastal ranges of eastern Australia. Records extend from central Queensland through New South Wales to Victoria, with distribution associated mainly with forested coastal ranges and adjoining tablelands.

In Queensland, the species occurs through the subtropical coastal and near-coastal forest zone, with records extending north to the Clarke Range in central Queensland. It is recorded in the Brisbane area, particularly in the western suburbs and forested areas around Mount Nebo and Mount Glorious.

In New South Wales, it occurs from the coast to the forested eastern edge of the tablelands. The NSW range includes the North Coast, New England Tableland, Sydney Basin, South East Corner and South Eastern Highlands bioregions. The cleared Hunter Valley appears to form a break between northern and southern populations.

In Victoria, it occurs in eastern forests from near Melbourne east and north-east to the New South Wales border. The Victorian range includes the Central Highlands, East Gippsland and other forested areas of eastern Victoria.

Distribution: Strongholds and subpopulations

The most important documented Victorian habitat is in large, continuous forest, including Mountain Ash forest and wet Mountain Grey Gum gullies. The species is numerically rare in eastern Victoria, where density is estimated at 1 to 9 individuals per 100 km².

A small, isolated subpopulation in the Strzelecki Range, South Gippsland, was last recorded in 1991. The species is absent or very rare in some apparently suitable Victorian areas, including the Otway Ranges and Wilsons Promontory, where small or fragmented forest patches may be unsuitable.

In NSW, the species persists in state forests and national parks. It has also been recorded in the Royal National Park and other forested coastal areas. In Brisbane, records are concentrated in western forested suburbs.

Distribution: Population information

Population estimates vary between jurisdictions and have low or moderate reliability. The Victorian assessment estimates 1,000 to 3,000 mature individuals, with 95 to 100 per cent of mature individuals in one subpopulation and a projected continuing decline.

The NSW review estimated more than 5,000 birds in NSW, based on an older estimate that more than half of the southern subspecies occurred in NSW. It also reported a minimum estimate of 2,000 pairs in NSW, but noted low reliability and data deficiency.

Victorian mature individuals: Estimated at 1,000 to 3,000, midpoint 2,000

Victorian density: About 1 to 9 individuals per 100 km² in eastern Victoria; less than 1 individual per 100 km² elsewhere in Victoria

NSW estimate: More than 5,000 birds, with a separate minimum estimate of 2,000 pairs

Known trend: Historical decline is inferred from clearing and habitat loss; continuing decline is projected in Victoria, while NSW populations may be stable in public forests

Habitat: Forest types

Sooty Owls use moist, structurally complex forest, especially where rainforest or dense understorey occurs in gullies. Large continuous forest blocks are preferred, while small patches and narrow strips are generally avoided.

Habitat includes subtropical and warm temperate rainforest, tall wet eucalypt forest, moist eucalypt forest and some open forest. Victorian records are associated mainly with wet Mountain Grey Gum gullies, rainforest and Mountain Ash forest.

In Queensland, the species prefers tall wet eucalypt forest in coastal and near-coastal ranges, particularly steep, densely vegetated areas and rainforest gullies.

The species can persist in some harvested forest mosaics where gully reserves, nest trees and prey habitat trees are retained, but the documents emphasise the importance of large forest blocks and old-growth elements.

Habitat: Structural requirements

Important habitat features include tall emergent trees, large hollow-bearing trees, dense mid-storey vegetation, rainforest understorey, vine tangles, tree ferns and sheltered gullies.

Roosting and nesting habitat is often associated with gullies, streams and steep densely vegetated terrain. Some prey species are also dependent on tree hollows, so the loss of old trees can reduce both nesting and food resources.

The NSW review reports that the species prefers forest or woodland blocks larger than 200 ha and avoids small patches and strips.

Preferred patch size: Forest or woodland blocks greater than 200 ha are preferred

Elevation limit: No elevation limit is given in the supplied documents

Climate range: Subtropical and temperate climatic zones of coastal eastern Australia

Foraging habitat: Diet

The Sooty Owl is a nocturnal predator that hunts mainly in dense forest and rainforest gullies, while also using drier forest around gullies and occasional open habitat beside wet forest.

Mammals provide most of the prey biomass. Recorded prey includes rodents, antechinuses, small possums and gliders, with prey sometimes taken up to potoroo or rabbit size.

The diet also includes birds, reptiles and large insects. Native terrestrial prey have declined in some areas, increasing dietary overlap and possible competition with the Powerful Owl.

  • Retain habitat that supports small mammals, possums, gliders, antechinuses, birds, reptiles and large insects.
  • Protect hollow-bearing trees because both the owl and some of its prey depend on hollows.
  • Avoid clearing dense gully vegetation and rainforest edges that provide cover and hunting structure.

Foraging habitat: Foraging areas

The species usually forages in dense forest, particularly rainforest gullies. It also hunts in drier forest surrounding gullies and occasionally in open habitat next to wet forest.

Resident breeding pairs defend nesting territories within larger home ranges. Home range size varies with habitat quality and prey density.

Home range: About 400 to 3,000 ha for resident breeding pairs

Movement capacity: Individuals are known to disperse up to 50 km, including across partly cleared areas

Activity: Nocturnal; the supplied documents do not provide a specific nightly hunting distance

Breeding habitat: Breeding biology

Breeding occurs in large hollows in old trees, usually in wet sclerophyll forest or rainforest and often close to gullies. Caves can also be used.

The breeding season is variable across the range. In Queensland, courtship is mainly recorded in March and April, incubation in June and July, and nestlings may be present until October. NSW information describes breeding as occurring from autumn to winter or in spring.

A single brood is raised in the wild each year. Young leave the hollow at about six weeks in the Queensland account, but remain near the nest and are fed by adults for several months. The NSW review gives a nestling period of about three months and post-fledging dependence of up to five months.

Breeding season: Variable, mainly autumn to winter or spring; Queensland records indicate courtship in March to April, incubation in June to July and nestlings until October

Clutch size: 1 to 2 eggs

Incubation: About 5 to 6 weeks

Nestling period: About 3 months in the NSW review; about 6 weeks to leave the hollow in the Queensland account

Post-fledging dependence: Up to 5 months

Age at maturity: Not stated in the supplied documents

Lifespan: Not stated in the supplied documents

Breeding habitat: Nest habitat

Nests are placed in large hollows more than 30 cm wide and up to 10 m deep in big, old trees. Hollows are usually in living trees but may occur in dead trees.

Tall emergent eucalypts, including smooth gums, are commonly used. The nest may be in wet sclerophyll forest, rainforest or at the edge of rainforest, and nests may be reused repeatedly.

Caves are an alternative nest site. Gully reserves and watercourse protection help retain breeding habitat where hollow-bearing trees and dense vegetation occur.

Hollow width: More than 30 cm

Hollow depth: Up to 10 m

Broods per year: Usually one

  • Retain all large old trees with suitable hollows, including standing dead trees where they do not create an unacceptable safety risk.
  • Avoid clearing, felling, vibration and high-noise works near confirmed or potential nest trees until a qualified survey has assessed whether the site is active.
  • Maintain dense vegetation and watercourse buffers around known nesting and roosting sites.

Sheltering habitat: Roost sites

Sooty Owls shelter by day in concealed hollows, caves and dense vegetation, usually in gullies or rainforest. Roost sites can be separate from nest sites but are associated with the same mature forest structure.

Roosts occur in tree hollows, caves, cliff ledges, rock crevices, rock overhangs and dense vegetation such as tree ferns or vine tangles.

Queensland records include roosting in rainforest with a dense vine understorey. Hollows in eucalypts, figs and rainforest trees may be used.

The supplied documents do not provide a standard roost hollow diameter or a defined roost buffer distance.

  • Inspect mature trees, cave entrances, rock shelters, tree fern stands and dense vine vegetation before clearing or major construction.
  • Retain shaded gully vegetation around potential roosts and avoid opening forest edges directly beside roost sites.
  • Keep confirmed roost and nest locations confidential and provide them to project personnel only where needed for protection.

Sheltering habitat: Protection around sites

The Brisbane guidance recommends a 100 m protective zone around nest sites that excludes clearing and protection from other disturbance during breeding. This is a project management guideline for large forest owls, not a published estimate of the Sooty Owl's roost territory.

Works should be preceded by an inspection of known or likely habitat. Where works cannot avoid the breeding period, they should be scheduled after nestlings have fledged and should follow site-specific ecological advice.

Indicative nest protection zone: 100 m around known nest sites in the Brisbane large forest owl guidance

Threats: Clearing and fragmentation

The main project risks are removal of old forest, loss of hollow-bearing trees, fragmentation of large forest blocks and disturbance of nest or roost sites. Fire and reduced prey availability can add pressure, particularly where habitat is already isolated.

Clearing for agriculture, forestry, firewood collection, plantations, roads and urban development has reduced and fragmented habitat. Richer soils and gentle terrain, which can provide productive prey habitat, have been heavily cleared.

The species prefers forest blocks larger than 200 ha and avoids small patches and strips. Fragmentation can reduce dispersal and genetic exchange, although individuals can disperse up to 50 km across partly cleared areas.

Loss of old-growth trees removes nest hollows and can reduce prey that depend on hollows.

  • Avoid clearing large old trees, hollow-bearing trees, dense gully vegetation and rainforest edges.
  • Design access tracks, service corridors and infrastructure to retain connected forest and avoid narrow strips of retained vegetation.
  • Treat removal of any tree with a large hollow as a potential direct impact on both the owl and its prey.

Threats: Fire and altered forest structure

Extensive bushfire has removed breeding habitat by destroying or causing the felling of hollow trees. The 2019 to 2020 fires affected 47 per cent of likely Sooty Owl habitat across Victoria.

Too-frequent fire can alter forest structure, reduce dense understorey and affect prey availability. Smoke, noise and fire near an active nest can cause abandonment or kill eggs and young.

Fire can increase post-fire predation risk for eggs and nestlings and can leave surrounding habitat unsuitable.

Victorian habitat affected by 2019 to 2020 fires: 47 per cent of likely habitat

  • Avoid planned burns near known nest trees during the breeding period.
  • Reduce fine fuel around known nest trees before a planned burn where this can be done without damaging roots, hollows or understorey.
  • Assess fire impacts on hollow trees, gully vegetation and prey habitat after a fire before commencing salvage or clearing.

Threats: Construction disturbance and roads

Construction noise, vibration, lighting, vegetation removal and increased human activity near a nest or roost can cause disturbance, nest abandonment or breeding failure.

The supplied documents do not provide a species-specific road mortality rate or road-crossing threshold. Roads remain relevant because they remove forest, divide habitat and can increase access, noise and edge effects.

  • Complete a pre-clearing inspection of likely habitat, including old trees, gullies, caves and dense rainforest vegetation.
  • Keep known nest locations confidential and establish site-specific exclusion and work timing controls.
  • Avoid night lighting directed into gullies, rainforest edges and known roost or foraging areas.

Threats: Prey decline and introduced predators

Reduced native prey availability is a major concern because mammals provide most of the Sooty Owl's prey biomass. Exotic species, particularly predators that reduce prey availability, have been identified as a major issue in eastern Victoria.

Declining terrestrial prey can increase dietary overlap and possible competition with the Powerful Owl. The supplied documents do not identify a disease as a confirmed major threat to the Sooty Owl.

  • Retain understorey, fallen timber and hollow-bearing trees that support small mammals and other prey.
  • Control introduced predators in accordance with approved project and land manager programs, without disturbing owl nest or roost sites.
  • Do not assume that retaining canopy trees alone will maintain foraging habitat if dense gully vegetation and prey cover are removed.

Threats: Hydrology and watercourses

Sooty Owl nest and roost habitat is often associated with gullies, streams and wet forest. Changes to drainage, sediment movement, watercourse vegetation and moisture conditions can reduce the dense forest structure used for shelter and foraging.

The supplied documents do not quantify a hydrology threshold for the species, but recommend watercourse protection zones around large forest owl nesting and roosting habitat.

  • Protect streamside and gully vegetation during earthworks, trenching, road construction and drainage changes.
  • Prevent sediment, spoil, contaminated runoff and altered drainage from entering wet forest gullies.
  • Apply watercourse protection prescriptions around known or suspected nest and roost sites.

Survey methodology: 1. Habitat assessment and day searches

Survey effort should focus on wet forest, rainforest gullies, large old trees and other areas that provide hollows, caves or dense roosting cover. The supplied documents do not prescribe a national survey effort for Sooty Owls, so the project ecologist should set effort from the extent and quality of suitable habitat, the proposed disturbance and relevant state requirements.

Map wet sclerophyll forest, rainforest, gullies, creek lines, dense vine or tree-fern cover, caves, rock overhangs and large old trees before nocturnal surveys commence.

Inspect trees for large hollows, particularly hollows more than 30 centimetres wide and up to 10 metres deep, which may be used for nesting.

Record hollow-bearing trees, caves, roost cover, prey habitat, connected forest and any proposed clearing boundary on project plans.

Do not treat the absence of a visible owl, pellet or nest as evidence that suitable habitat is unused. Sooty Owls are solitary or occur in pairs and can be difficult to detect.

Key habitat: Subtropical and warm temperate rainforest, moist eucalypt forest and tall wet eucalypt forest, especially densely vegetated gullies

Nest hollows: Usually large hollows more than 30 centimetres wide and up to 10 metres deep in large old trees

Roost sites: Tree hollows, caves, cliff ledges or crevices, rock overhangs and dense vegetation such as tree ferns or vine tangles

Survey methodology: 2. Nocturnal spotlighting and listening

Undertake nocturnal searches in and around gullies, rainforest, dense wet forest, creek lines and the retained forest adjoining the works area.

Search from dusk through the first part of the night, when a sedentary, territorial owl is likely to be detected moving between roosting and foraging areas.

Use quiet spotlighting and listening from tracks, existing clearings and other access routes, and avoid entering dense vegetation or approaching a suspected nest unless this is necessary for an approved assessment.

Record all visual, call and incidental detections with the date, time, location, habitat, behaviour and direction of travel.

The supplied documents do not specify a fixed number of nights, hours, transect length or survey area. The ecologist should document the selected effort and repeat visits where weather, access or detection conditions are poor.

Foraging habitat: Dense forest, particularly rainforest gullies, with occasional use of drier forest around gullies and open habitat next to wet forest

Territory size: About 300 to 3,000 hectares, depending on habitat quality and prey density

Movement: Generally sedentary and strongly territorial; dispersal of up to 50 kilometres has been recorded

Survey methodology: 3. Nest, roost and prey checks

Search for pellets, feathers, prey remains, calls, whitewash and repeated owl activity beneath likely roosts, while keeping observers and equipment away from hollows and caves.

Assess whether hollow-bearing trees and nearby prey habitat will be retained, felled, isolated or exposed by the proposal.

Treat large old trees, hollow logs, dense understorey, moist gullies and connected forest as linked habitat features because the owl uses both arboreal and terrestrial mammals as prey.

Do not enter a cave, climb a tree or inspect a hollow internally unless the method is authorised, safe and necessary, because these actions may disturb an owl or other fauna.

Diet: Arboreal and terrestrial mammals, including rodents, antechinuses, small possums and gliders, as well as some birds and large insects

Breeding: Usually one or two eggs, with incubation about six weeks and young remaining near the nest and dependent on adults for several months

Breeding period: Mainly winter, with courtship from March to April, incubation from June to July and nestlings recorded until October

Survey methodology: Minimum effort and reporting

  • Use a suitably qualified ecologist to define and justify the survey area, number of visits, survey nights, search hours, transect routes and weather constraints in the survey plan.
  • Give priority to repeated nocturnal searches of all suitable gullies, rainforest, large hollow-bearing trees, caves and connected retained forest within and beside the impact area.
  • Record nil results, survey limitations, access constraints, weather, moon or light conditions, observer effort, equipment and all detection evidence.
  • Submit confirmed records and relevant nil-survey information to the relevant state wildlife database, such as the NSW BioNet Atlas or Victorian biodiversity records system, and retain the full project dataset.
  • Report the location of nest trees, roosts and other sensitive records on a need-to-know basis to reduce disturbance and the risk of illegal collection.

Before habitat disturbance: Avoid and minimise

The main project risks are removal of wet forest and rainforest habitat, loss of hollow-bearing trees, fragmentation, disturbance near nests and roosts, altered prey habitat and inappropriate fire. Avoid impacts first, then reduce the footprint and protect retained habitat.

  • Redesign the works to retain rainforest gullies, wet eucalypt forest, creek lines, dense roost cover, caves, large old trees and connected forest blocks.
  • Retain all known and potential nest and roost trees, including live and dead hollow-bearing trees, unless removal is unavoidable and specifically authorised.
  • Maintain forest connections between the impact area and retained habitat, because the species prefers large forest blocks and avoids small patches and strips.
  • Keep clearing out of gullies and watercourse protection areas wherever practicable, and prevent indirect damage from sediment, drainage changes, lighting, noise and machinery access.
  • Do not rely on a cleared buffer around an isolated tree if the surrounding prey habitat and forest connection will be removed.

Before habitat disturbance: Approvals and work planning

  • Check the current EPBC Act listing and referral requirements before works begin, because the supplied Queensland source records the species as not nationally listed but Commonwealth status must be checked against the current register.
  • Obtain the relevant state approvals, permits and wildlife authorities for clearing, handling, relocation, nest disturbance and rehabilitation in the project jurisdiction.
  • Plan high-noise, vibration and vegetation-clearing activities away from the main breeding period of March to October where practicable, with particular care from June to October when incubation and nestlings may be present.
  • Prepare a fauna management plan that identifies suitable habitat, survey results, exclusion areas, qualified personnel, stop-work triggers, handling limits, release sites, injured-fauna arrangements and reporting requirements.
  • Stage clearing so that retained forest, gullies and movement connections remain available while work proceeds.

Before habitat disturbance: Site preparation

  • Complete a pre-clearance inspection shortly before works, including a targeted nocturnal check where suitable habitat or previous records occur.
  • Mark nest trees, roosts, caves, hollow-bearing trees, retained logs, gullies, creek lines and exclusion areas on the ground and in the contractor plans.
  • Install and maintain exclusion fencing or clearly marked no-go zones where they can protect retained habitat from machinery, spoil, vehicles, lighting and material storage.
  • Brief all operators on the Sooty Owl identification features, sensitive habitat, work limits, stop-work process and the requirement to contact the fauna spotter catcher before touching fauna or habitat features.
  • Keep nest and roost locality information confidential and restrict it to people who need it for the work.

During habitat disturbance: Daily controls and machinery interface

A fauna spotter catcher should control the interface between machinery and habitat. Work must stop when an owl, active nest, occupied hollow or other protected fauna feature is found, until the authorised ecologist confirms the control response.

  • Inspect exclusion fencing, habitat markers, access routes and retained trees at the start of every shift and after storms, fire or changes to the work area.
  • Use a suitably qualified fauna spotter catcher during clearing and other activities that may affect trees, gullies, dense vegetation, caves or other fauna habitat.
  • Keep machinery outside marked exclusion zones and require the operator to stop before a tree, log, rock, cave, hollow or dense vegetation feature is disturbed.
  • Clear in stages towards retained habitat only where this is safe and supported by the fauna management plan, giving animals an opportunity to move away without being forced into traffic or active machinery areas.
  • Stop work if visibility is poor, lighting causes unmanageable glare, a nest or roost is suspected, or the spotter catcher cannot safely inspect the next habitat feature.

During habitat disturbance: Habitat feature handling

  • Do not fell or damage hollow-bearing trees, including large dead trees, until the fauna spotter catcher and authorised ecologist have checked them and confirmed that removal is permitted.
  • Retain hollow logs, fallen timber, dense understorey, caves, rock overhangs and moist ground cover where practicable because these features support roosting habitat and prey.
  • Do not burn, bury, chip or remove habitat features from exclusion areas without written approval under the fauna management plan.
  • Protect gullies, creek lines, wetlands and drainage areas from sediment, altered flows, chemical contamination, night lighting and unnecessary vehicle access.
  • If a tree containing a suspected hollow must be removed, use the approved staged-felling and inspection procedure, keep people clear of the drop zone and stop if an owl, eggs, young or other fauna is detected.

During habitat disturbance: If an owl or other fauna is found

  • Stop the immediate activity and keep workers, vehicles, lights and dogs away from the animal, nest or roost.
  • Do not handle an adult Sooty Owl, eggs or young unless the person is authorised under the relevant state law and the approved fauna management plan.
  • Allow an uninjured owl to leave on its own where safe, and do not chase, spotlight continuously or block its flight path.
  • If relocation is authorised and necessary, use a suitably qualified and authorised handler and release the animal into nearby suitable retained forest, with the release location and rationale recorded.
  • Send an injured owl promptly to an appropriately qualified wildlife veterinarian or licensed wildlife carer, following state wildlife procedures.
  • Keep the area closed until the ecologist determines whether the site is an active nest, roost or other protected feature and sets the required controls.

During habitat disturbance: Stop-work triggers and records

  • Stop work for any Sooty Owl detection within the work area, an active or suspected nest, an occupied hollow, a roost, eggs, dependent young, an injured animal or damage to a marked exclusion area.
  • Record the date, time, precise location, habitat, animal condition, behaviour, photographs where safe, people involved, machinery status, actions taken and the name of the approving ecologist or wildlife authority.
  • Notify the project environmental officer and relevant regulator when required by the approval, fauna management plan or state permit.
  • Do not restart work in the affected area until the authorised ecologist documents the clearance decision, revised buffer or other control.

After habitat disturbance: Post-clearance checks

Post-work checks must confirm that retained habitat remains functional and that no owl, nest, roost or habitat feature was missed. Monitoring should be scaled to the impact, the quality of retained habitat and the approval conditions.

  • Inspect the cleared area, retained edge, access tracks and exclusion zones for injured fauna, trapped animals, damaged hollows, fallen logs, displaced rocks and unplanned impacts.
  • Complete a final check of trees and habitat features that were retained beside the works, particularly where vibration, fire, pruning, excavation or altered drainage occurred.
  • Repeat nocturnal searches in retained gullies and wet forest if the project affected known habitat, a nest area, a roost or a connected forest edge.
  • Repair fencing, markers and erosion controls immediately if they are damaged or no longer protect retained habitat.

After habitat disturbance: Monitoring and reporting

  • Monitor retained habitat for Sooty Owl presence, roost use, nesting activity, prey habitat condition and connectivity using the same mapped locations and methods used before disturbance.
  • Monitor during and after the breeding period, with particular attention to March to October and to the June to October incubation and nestling period.
  • Report detections, mortality, injuries, nest disturbance, habitat loss, control failures and corrective actions to the project environmental officer and relevant authorities.
  • Update state wildlife databases with verified records and provide approval reporting, survey data, photographs, maps and monitoring results in the required format.
  • Maintain confidential handling of nest and roost locations in public reports.

After habitat disturbance: Ongoing controls and offsets

  • Maintain no-go zones, nest or roost buffers, watercourse protection, lighting controls, weed controls, erosion controls and fire precautions for the life of the project where required.
  • Review the site after major fires, storms, flooding, changes in drainage or new construction stages because these events can alter hollows, prey habitat and forest connectivity.
  • Apply approved offsets or other compensatory measures where residual impacts remain and the approval requires them, with measures directed to protecting and restoring suitable wet forest, rainforest, hollows and connected habitat.
  • Use adaptive management when monitoring shows reduced occupancy, nest abandonment, loss of prey habitat or continuing edge impacts.

Rehabilitation actions: Restore forest structure and connections

Rehabilitation should recreate the structure and moisture conditions of wet forest and rainforest habitat, not just replace canopy cover. The priority is to restore connected gullies, old-tree habitat, dense understorey and prey resources over time.

  • Revegetate cleared gullies, creek lines, rainforest margins and forest edges with locally appropriate native wet-forest and rainforest species identified by the project ecologist and local vegetation community reference.
  • Use locally sourced plants and retain natural regeneration where it is healthy, while protecting planted areas from browsing, trampling, machinery and weed competition.
  • Restore continuous vegetation between retained forest blocks and avoid narrow strips that do not provide secure roosting, nesting or foraging habitat.
  • Maintain dense mid-storey and understorey vegetation, including tree ferns, vine tangles and shrubs where appropriate to the local community.

Rehabilitation actions: Replace habitat features

  • Retain existing hollow-bearing trees and dead standing trees wherever safe, because replacement trees may take 100 years or more to develop critical hollows.
  • Where approved and ecologically suitable, install nest or roost boxes designed and placed by a qualified owl ecologist, without presenting a fire, predator, disease or competition risk.
  • Retain or reinstate coarse woody debris, hollow logs, rocks and dense ground cover to support small mammals and other prey.
  • Do not assume a nest box replaces a large natural hollow, cave or mature forest tree, and monitor any installed box for use and maintenance needs.

Rehabilitation actions: Fire, weeds and predators

  • Develop a fire plan that protects retained and rehabilitated nest trees, roosts, gullies and dense forest from damaging fire intensity and unsuitable fire frequency.
  • Before planned burns, identify active nest areas, minimise smoke and disturbance near breeding birds, and reduce fuel around known nest trees only under an approved ecological fire plan.
  • Control weeds that simplify understorey structure or reduce prey habitat, using methods that do not contaminate gullies, caves, hollows or watercourses.
  • Manage introduced predators and prevent domestic cats and dogs from entering retained and rehabilitated forest, particularly where monitoring identifies predation risk.

Rehabilitation actions: Monitoring and success measures

  • Inspect rehabilitation after planting, storms, fire and major rainfall for survival, weed invasion, erosion, browsing, structural development and connectivity with retained forest.
  • Use repeat nocturnal surveys, listening, pellet or prey-remain searches and habitat inspections to test whether Sooty Owls are using the rehabilitated area.
  • Set site-specific success measures for plant survival, native understorey cover, hollow and log retention, watercourse stability, weed reduction, predator control and connection to suitable forest.
  • Continue monitoring until the project ecologist and approval authority agree that the restored habitat is stable and capable of supporting roosting, nesting and foraging functions.

Sources