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Agile Antechinus (Antechinus agilis)

The Agile Antechinus is a small, semi-arboreal marsupial of wet forests, open forests and woodlands in south-eastern Australia. On development sites, it is associated with mature trees, tree hollows, fallen logs and native ground cover, and clearing can remove both shelter and invertebrate food resources.

Conservation status

South Australia, National Parks and Wildlife Act 1972: Endangered.

Breeding season

The following pattern is based on the documented winter mating period, 27-day gestation, five-week pouch period and approximately three-month nest period. Exact birth and dispersal dates are not given and may vary between sites.

Months are January to December. The source material gives seasons and durations rather than fixed calendar dates, so the monthly pattern is indicative.

  • Breeding: Mating occurs over a few weeks in winter, with males generally dying shortly after breeding.
  • Young: Birth follows about 27 days after mating. Young spend about five weeks in the pouch and then about three months in a leaf-lined nest.
  • Movement and dispersal: Young males disperse after the nest-rearing period. Females generally remain close to their natal area.
  • Highest clearing risk: Risk is highest during winter mating and while dependent young are in pouches or nests. Hollow and nest checks are needed before clearing in every month.

Identification

The Agile Antechinus is a small dasyurid with a grey-brown back, paler underparts and a thin, lightly furred tail. It is quick moving and can climb readily, so it may be encountered on the ground, in dense understorey or in trees.

The head and body are around 10 cm long, with a tail of similar length. The upper fur is grey-brown and the underside is lighter grey. The eyes are dark and prominent, the ears are rounded and pink-grey, and the feet are paler than the body.

The species is semi-arboreal and can move rapidly through shrubs, logs and trees. It may be active at night and, when food is scarce, may also forage during the day.

Body mass: 16 to 40 g in the study description

Body length: Head and body around 10 cm

Tail: Around 10 cm

Identification: Similar species

The Agile Antechinus is often confused with the larger Brown Antechinus, Antechinus stuartii. At a distance, it may also resemble a Black Rat or Bush Rat.

Size, body shape, fur colour and habitat context should be considered together. Reliable identification may require close examination, measurement, photographs or genetic confirmation because the source material does not provide a complete field key separating these species.

Identification: Signs and handling observations

Communal nesting is common for adults, with groups of about 20 reported during most of the year. Nests are associated with tree hollows, including low-lying hollows containing leaf lining.

Mothers give a soft chit call to young. Nestlings may respond with a weak siss call, while adults displaying aggression can give more intense siss calls.

Tracks, scats, eyeshine and diagnostic feeding signs are not described in the provided documents. A small mammal detected in a hollow, log or dense ground cover should not be identified from habitat alone.

  • Inspect tree hollows, fallen logs and dense ground cover before clearing.
  • Treat a nest containing young or repeated antechinus activity as a fauna management issue and obtain advice from the project ecologist or fauna spotter catcher.

Distribution: Documented range

The documented distribution is centred on south-eastern Australia. The supplied material does not provide a complete national map, confirmed IBRA bioregion list or population estimate.

The species is reported from the south-eastern half of Victoria and the southernmost parts of New South Wales, extending along the south coast and inland to elevations of 2000 m.

The supplied sources refer to wet forest ecosystems in south-eastern Australia and include records or study locations in the Great Otway National Park and around the ACT.

States and territories described in the sources: Victoria and southern New South Wales; the ACT is mentioned in local habitat and threat information

Elevation: Reported inland to 2000 m

Named study area: Great Otway National Park, Victoria

Distribution: Listing and population information

The supplied listing information records the species as not listed under the EPBC Act and as Endangered in South Australia. The provided documents do not establish a South Australian distribution, population size or population trend.

No national population estimate, density estimate, confirmed stronghold or subpopulation structure is given. Local abundance may be affected by loss of mature trees, native forest and nesting resources.

EPBC Act: Not listed, according to the supplied project information

South Australian listing: Endangered, according to the supplied project information

Population size: Not stated in the provided documents

Population trend: Not stated in the provided documents

Habitat: Vegetation types

Agile Antechinuses use a range of forest environments, particularly wet forests with native understorey and mature trees. They can also occur in urban areas where native vegetation remains connected to nearby forest.

Documented habitats include wet forest ecosystems, forested habitats with dense ground cover, subtropical eucalypt forest floodplains, heathy woodland and open forest.

The Great Otway study area contained messmate and brown stringybark in the canopy, with prickly tea tree, heath, myrtle wattle, sedge, grass tree, bracken fern and tussock grass in the mid-storey and ground layer.

Habitat: Structure and condition

Important structural features include mature trees, tree hollows, fallen logs, native ground cover and low fire frequency. The species can use relatively open understorey as well as structurally complex vegetation, and the available study found no consistent selection for individual microhabitat features.

Habitat should be assessed across the vertical profile because the species forages on the ground and climbs through shrubs and trees. Retaining connected native vegetation around hollow-bearing trees and logs is particularly relevant during clearing.

  • Retain hollow-bearing trees and fallen logs where safe and practicable.
  • Retain native sedges, ferns, shrubs, leaf litter and other ground cover around retained trees.
  • Avoid isolating retained trees from nearby native vegetation.

Habitat: Climate and elevation

The documented range extends inland to 2000 m and includes temperate south-eastern forests. The supplied material does not define a lower elevation limit, rainfall threshold or temperature limit.

Upper elevation reported: 2000 m

Climate information: Temperate forest conditions are documented for the Great Otway study area

Foraging habitat: Diet

The Agile Antechinus is primarily an invertebrate predator that searches through ground cover, logs, shrubs and trees. Its semi-arboreal habits allow it to forage above the ground as well as through leaf litter and low vegetation.

The diet includes large beetles, spiders and cockroaches. Small lizards and soft berries are eaten occasionally, and broader descriptions include other invertebrates, small vertebrates and some plant material.

A continuing supply of native food is required to maintain normal breeding behaviour. Clearing that removes native ground cover, logs, shrubs or tree hollows can reduce access to prey and feeding sites.

Main food: Invertebrates, especially large beetles, spiders and cockroaches

Occasional food: Small lizards, soft berries and other plant material

Foraging habitat: Foraging sites and behaviour

The species is a fast-moving climber that can chase prey through the understorey. It uses forested habitats with dense ground cover, but observations from the Great Otway study also recorded it moving through more open understorey and often crossing logs or climbing trees.

The provided documents do not give a home-range size, regular foraging distance or population density. Surveys should therefore cover ground cover, fallen timber, shrubs, tree bases and hollows rather than relying only on open-ground trapping.

  • Search beneath and around logs, dense ground cover and low vegetation.
  • Inspect retained trees and low hollows because the species may climb and forage above ground.
  • Use trapping or other approved fauna survey methods where presence needs to be confirmed.

Breeding habitat: Breeding biology

Breeding is strongly seasonal and occurs over a short winter mating period. Breeding sites need secure hollows or other nest sites, nearby native food and enough cover for females and young.

Mating lasts for a few weeks in winter and is followed by the death of all or most males. Females give birth after a 27-day gestation, carry the young in the pouch for about five weeks and then raise them in a leaf-lined nest for a further three months.

Young males disperse to a new territory after the nest-rearing period, while females generally remain nearby. The documents do not state age at maturity or lifespan.

Breeding season: A few weeks in winter

Litter size: Six to ten young

Gestation: 27 days

Pouch period: About five weeks

Nest-rearing period: About three months after leaving the pouch

Age at maturity: Not stated in the provided documents

Lifespan: Not stated in the provided documents

Breeding habitat: Breeding habitat features

Adults commonly nest communally in tree hollows. Females and young use low-lying tree hollows with leaf lining after the pouch period.

Mature trees, standing hollows, fallen logs, dense native ground cover and a reliable supply of invertebrate prey should be retained around potential breeding habitat. The species is associated with low fire frequency, which helps maintain these structures.

  • Inspect hollow-bearing trees and low hollows before felling or limb removal.
  • Retain connected ground cover and fallen timber around retained breeding trees.
  • Schedule hollow-tree works outside the winter breeding period where project constraints allow, and use a fauna spotter catcher during unavoidable works.

Sheltering habitat: Hollows and nests

The main documented refuges are tree hollows and leaf-lined nests, with communal nesting common outside the breeding period. Fallen logs and dense ground cover also provide movement cover and potential shelter.

The species depends on hollow trees and logs on the forest floor for nesting and foraging resources. Adults mostly nest communally, with groups of about 20 reported during most of the year.

After leaving the pouch, young move into a leaf-lined nest in a low-lying tree hollow and remain there for about three months while being fed by the mother.

Typical communal group: About 20 adults

Nest location: Low-lying tree hollow, lined with leaves

Known refuge dimensions: Not stated in the provided documents

  • Check tree hollows, cavities at low height and hollow logs before clearing.
  • Treat leaf-lined material inside a hollow as a possible nest and stop work until it has been assessed.
  • Retain hollow-bearing trees and logs wherever safety and design constraints permit.

Sheltering habitat: Ground and fire refuges

Dense ground cover, fallen logs, shrubs and complex vegetation provide cover while the species moves and feeds. The species is semi-arboreal, and tree hollows may help it shelter during low-intensity fire.

A study of a low-intensity prescribed burn found no significant change in Agile Antechinus microhabitat selection. The authors considered tree hollows and scansorial behaviour possible reasons for this response, but noted that higher severity fire may reduce hollow availability.

  • Maintain unburnt or lightly disturbed cover around retained trees during works.
  • Avoid piling, burning or removing fallen timber until fauna habitat has been checked.
  • Do not assume that survival after a low-intensity burn means hollows and ground cover are no longer required.

Threats: Clearing and development

The main documented risks are loss of native forest, removal of mature trees and hollows, forestry and plantation activities, bushfire and predation. Clearing can affect the species directly by removing shelter and indirectly by reducing food and increasing exposure to predators.

Land clearing, loss of native forest, exotic tree plantations and native forestry actions are identified threats. Loss of mature trees and native forest around the ACT is specifically linked to reduced nesting and foraging resources.

Construction clearing can remove hollow-bearing trees, fallen logs, leaf litter, shrubs and dense ground cover in a single operation. Fragmentation can also separate retained trees from the native vegetation used for foraging and dispersal.

  • Complete a pre-clearing habitat assessment that includes mature trees, hollows, fallen logs and ground cover.
  • Use staged clearing and fauna spotter catcher procedures where the species may occur.
  • Retain linked patches of native vegetation rather than isolated trees where practicable.

Threats: Fire and loss of cover

Bushfires and inappropriate fire regimes can reduce ground cover, structural complexity, food resources and hollow availability. Low-intensity fire had little measured effect on Agile Antechinus habitat use in one study, but the authors noted that higher severity fire is more likely to affect tree hollows.

Fire can also increase exposure to predators by simplifying vegetation. Maintaining unburnt refuges is relevant where fire or fuel-reduction works are planned.

  • Retain unburnt patches and protect hollow-bearing trees during planned burns where practicable.
  • Avoid broad, high-severity burns across connected antechinus habitat.
  • Inspect recently burnt areas for surviving hollows and remaining ground cover before further disturbance.

Threats: Predation

Known predators include feral cats, foxes and several owl species. Simplified vegetation after fire can make small mammals easier for predators to detect or catch.

Removing cover during clearing may therefore increase risk even where individual animals survive the initial disturbance.

  • Keep retained ground cover and logs connected around refuge trees.
  • Manage feral cats and foxes in accordance with the project fauna management plan.
  • Avoid leaving cleared edges with long periods of exposed ground where fauna must cross between habitat patches.

Threats: Other project risks

The provided documents do not give species-specific evidence about road mortality, disease or hydrology change. These risks should still be considered where roads, drainage, floodplain works or altered water movement remove forest cover or divide habitat.

A project assessment should distinguish documented Agile Antechinus impacts from general small-mammal risks and record any local observations.

  • Check road and access-track designs for breaks between retained forest patches.
  • Prevent drainage or floodplain works from drying native understorey and hollow-bearing forest.
  • Record carcasses, trapped animals and den or nest observations during construction monitoring.

Survey methodology: 1. Targeted trapping

Agile Antechinuses are small, semi-arboreal marsupials of wet forests and other forest environments. Survey effort should target nocturnal activity and should include trapping where disturbance could remove mature trees, logs, dense native vegetation or connected forest habitat.

Use live trapping as the primary species survey method where the project may disturb suitable forest habitat.

The available species profile identifies trapping as the survey technique for Agile Antechinus, but it does not provide a national minimum trapping effort.

A published study trapped animals with Type A Elliott traps, using 20 to 30 active traps per 1 ha site, with traps opened before 1700 hours and checked between 2200 and 0300 hours.

Place traps in densely vegetated gullies and other forested areas containing logs, tree hollows and native ground cover.

Obtain the required wildlife research, scientific, animal ethics and handling approvals before trapping.

Published trap layout: Thirty trap stations across three parallel lines, with lines 30 m apart and traps 15 m apart.

Published trap site size: 1 ha.

Published checking period: Traps opened before 1700 hours and checked between 2200 and 0300 hours.

  • Run trapping during periods when the species is active, particularly at night, and avoid interpreting a zero result during severe food scarcity or other conditions that may promote inactivity.
  • Use suitable bait and inspect traps at the stated checking interval so that captured animals are not left exposed or stressed.
  • Record trap locations, dates, weather, habitat condition, trap effort, captures, recaptures and any non-target animals.
  • Handle captured animals only under the authority of the relevant permit and by trained personnel.

Survey methodology: 2. Nocturnal habitat searches

Supplement trapping with systematic nocturnal searches of retained forest, gullies, logs and tree-hollow habitat when access and safety conditions allow.

The species is mostly nocturnal but can be active during the day, and it may become dormant when winter food is scarce.

Search effort should cover the full disturbance footprint and adjoining retained habitat, with the route, time, weather, observers and detection conditions recorded.

  • Search slowly around dense ground cover, fallen logs, low tree hollows and connected native vegetation, while avoiding disturbance to potential shelter sites.
  • Use a consistent route and record direct sightings, calls, tracks, scats and other evidence separately from trapping records.
  • Treat a failure to detect the species as inconclusive where vegetation is dense, access is poor, fire has recently altered the site or survey conditions are unsuitable.

Survey methodology: 3. Spool and line tracking after capture

Use spool and line tracking where the project requires information about habitat use or where a captured animal needs to be associated with particular habitat features.

In the published study, spools weighed 1 to 1.5 g for antechinuses, less than 5 percent of body weight, and were attached to the lower back before release.

The study followed each line on the next day and recorded habitat attributes along the animal trail.

Published study effort: Twenty-two Agile Antechinus trails were measured across all treatments.

Published trail length: Mean trail length was 43.36 m, with a standard error of 3.32 m.

  • Use an experienced operator and an approved animal ethics and handling procedure for attaching and removing a spool.
  • Record the start point, trail length, route, tree hollows, logs, ground cover and other habitat features used by the animal.
  • Do not treat the published spool study as a substitute for a presence survey, because its mean trail length was about 43 m and the authors identified short trails as a limitation.

Survey methodology: Minimum effort and reporting

  • Use a documented, risk-based survey design that covers all suitable habitat within the disturbance footprint and nearby retained habitat, because the supplied documents do not set a national minimum effort for Agile Antechinus surveys.
  • Record the number of trap nights, trap locations, search hours, search area, weather, fire history, vegetation structure, hollow-bearing trees, logs and all detection results.
  • Submit confirmed records and the survey report to the relevant state wildlife database, subject to permit and data-sharing requirements.
  • Report the survey methods, effort, animal welfare approvals, fauna handling outcomes, relocation locations and any injured or dead animals to the project approval holder and the relevant regulator.

Before habitat disturbance: Avoid and minimise habitat loss

Plan the works around the Agile Antechinus's dependence on native forest, tree hollows, logs and connected ground cover. Retain shelter and foraging resources wherever practicable, and resolve approval and fauna-handling requirements before machinery enters the site.

Retain mature native trees, tree hollows, fallen logs, dense ground cover and connected forest vegetation within and beside the work area.

Avoid clearing forest patches with multiple shelter features where an alternative work footprint is available.

Maintain movement links between retained forest, gullies and nearby native vegetation, because the species uses forested habitats and can move through trees and ground vegetation.

  • Map and mark hollow-bearing trees, fallen logs, dense native understorey and any known capture or sighting locations before finalising the clearing boundary.
  • Keep machinery, spoil, access tracks and storage areas outside retained habitat and outside marked tree protection zones.
  • Retain unburnt or structurally intact refuge patches where fire or clearing is part of the project.

Before habitat disturbance: Approvals and work planning

Check the current Commonwealth and state conservation status before works begin and obtain all required state wildlife, scientific, handling and relocation approvals.

The supplied profile records that Agile Antechinus is not listed under the EPBC Act, but state requirements still need to be checked for the project location.

Prepare a fauna management plan covering survey triggers, stop-work rules, authorised handlers, relocation sites, injured-animal care, daily inspections and reporting.

  • Schedule clearing outside periods of high breeding and dependent-young risk where the project approval and ecological advice allow this, noting that mating occurs for several weeks in winter and young remain dependent on the mother for an extended period.
  • Stage clearing so that retained vegetation and nearby refuge habitat remain available while each work area is checked and released.
  • Consult the relevant state agency if the species is recorded in a state where it has a threatened listing or if the proposed action could affect protected habitat.

Before habitat disturbance: Pre-clearance preparation

Complete the approved pre-clearance survey shortly before clearing, using trapping and nocturnal searches suited to the habitat and project risk.

Mark all habitat features that must be retained, including hollow-bearing trees, logs, dense native ground cover and movement links.

Install exclusion fencing only where it can guide animals towards retained habitat without trapping them in the clearing area or blocking access to shelter.

  • Brief the fauna spotter catcher, supervisors and machine operators on the marked exclusion zones, likely habitat features and the stop-work procedure.
  • Check that the nominated relocation area contains suitable native forest, ground cover, logs and tree-hollow resources before any animal is moved.
  • Inspect exclusion fencing and the work area each morning for trapped, injured or displaced fauna.

During habitat disturbance: Daily controls and machinery interface

Clear in small, controlled stages under direct fauna supervision. The fauna spotter catcher must control the release of each work area and must be able to stop machinery immediately when an Agile Antechinus or its shelter is found.

Conduct a pre-start inspection of the work area, exclusion fencing, marked trees, logs, ground cover and any open excavations.

Keep the fauna spotter catcher in direct communication with the machine operator and supervisor throughout vegetation removal.

Clear from the retained-habitat edge towards the retained refuge area where this is safe and consistent with the approved fauna management plan.

Use low-speed, controlled machinery movements around trees, logs, dense understorey and other marked habitat features.

  • Do not commence the next clearing section until the spotter catcher has inspected and released it.
  • Stop machinery immediately when the spotter catcher gives the agreed stop signal or when an animal, nest, hollow, log shelter or burrow is found.
  • Do not allow personnel or machinery to chase, corner, handle or injure an Agile Antechinus.

During habitat disturbance: Habitat feature handling

Retain hollow-bearing trees and logs wherever the approved design allows, because Agile Antechinuses use tree hollows and logs for nesting and foraging resources.

Treat any tree hollow, fallen log, dense ground-cover patch or connected forest edge as potential fauna habitat until inspected by the authorised spotter catcher.

Do not burn or remove retained logs and hollow resources during clearing unless the approval specifically allows it and a fauna management procedure is in place.

  • Inspect hollow-bearing trees and likely low tree hollows before felling, and use an approved staged-felling procedure where removal cannot be avoided.
  • Place salvaged logs in nearby retained habitat where approved, without blocking animal movement or damaging existing shelter.
  • Fence or cover excavations and other ground hazards at the end of each shift, and check them before work recommences.
  • Keep wet areas and drainage lines clean and avoid sediment or spoil placement in retained forest habitat.

During habitat disturbance: Animal encounters, stop-work and records

Stop work in the immediate area when an Agile Antechinus is found, and allow the authorised fauna spotter catcher to assess whether it can move to retained habitat without handling.

Handle or capture the animal only when necessary for its welfare, safety or approved relocation, and only under the relevant permit and competency requirements.

Relocate an animal to nearby retained habitat that has suitable native vegetation, ground cover, logs and shelter, using the approved release method and location.

Send injured animals promptly to an appropriately qualified veterinarian or wildlife carer under the project fauna procedure.

  • Stop work if an animal is injured, if dependent young are suspected, if a hollow or nest is exposed, or if the approved clearing controls cannot be maintained.
  • Record the date, time, location, condition, identification, action taken, handler, relocation point and outcome for every encounter.
  • Record deaths, injuries, failed releases, escapes and any breach of the exclusion boundary and notify the project environmental officer and regulator where required.
  • Do not keep an Agile Antechinus on site overnight unless the relevant permit and welfare procedure expressly allow it.

After habitat disturbance: Post-clearance checks and monitoring

Clearing controls remain necessary after machinery leaves. Check the disturbed area and retained habitat, verify that relocated animals and shelter features were managed as approved, and use the results to adjust later work stages.

Complete a post-clearance inspection of the footprint, retained vegetation, logs, tree hollows, exclusion fencing, excavations and access routes.

Repeat targeted trapping or nocturnal searches where the pre-clearance survey detected Agile Antechinuses, where habitat removal was substantial or where the approval requires confirmation of absence.

Monitor retained habitat and relocation areas for animal detections, injured fauna, predator activity, fire damage, weed invasion and loss of ground cover.

  • Check the site after the first night and after major changes to the work area for trapped or displaced fauna.
  • Continue monitoring for the period specified in the approval or fauna management plan, noting that the published fire study assessed responses only from zero to three months after fire.
  • Compare post-work detections with the baseline using the same methods and record effort so that changes in detection are interpretable.

After habitat disturbance: Close-out and ongoing controls

Maintain exclusion fencing, retained-tree protection, log retention and fauna access routes until the environmental officer confirms that the risk has ended.

Provide a close-out report to the approval holder and relevant regulator, including survey effort, habitat removed and retained, encounters, handling, relocations, injuries, deaths and corrective actions.

Apply any approved offsets or habitat protection measures where residual impacts remain after avoidance and minimisation.

  • Submit confirmed records to the relevant state wildlife database and retain the source data, coordinates, photographs and permit records.
  • Review each clearing stage before releasing the next stage, and amend the fauna management plan if controls did not work as intended.
  • Keep relocation and veterinary records with the project environmental records for the period required by the approval.

Rehabilitation actions: Restore food and shelter resources

Rehabilitation should rebuild the forest structure and shelter resources used by Agile Antechinuses. Prioritise native understorey, tree-hollow replacement, logs, connected vegetation and a fire regime that does not repeatedly remove refuge habitat.

Replant locally appropriate native forest species that rebuild dense understorey and ground cover, using the approved vegetation community for the site.

Retain or reinstate fallen logs and woody debris in stable positions that provide shelter and foraging structure.

Protect natural regeneration and existing mature trees, because the species depends on hollow trees and logs for nesting and foraging resources.

  • Control weeds that reduce native ground cover or alter the structure of retained forest.
  • Install nest boxes only where natural hollows are unavailable and where their design, placement, monitoring and maintenance are approved by the project ecologist.
  • Link rehabilitated areas to retained native vegetation rather than creating isolated planting patches.

Rehabilitation actions: Fire, predators and site protection

Use a fire management approach that avoids frequent or severe loss of ground cover, logs and tree hollows.

Retain unburnt refuge patches during planned burns where safe and consistent with the approved fire regime.

Manage feral cats, foxes and other identified predators in accordance with the project and land-manager control programmes.

  • Do not schedule burns that remove all available shelter across a rehabilitation area at once.
  • Inspect rehabilitated habitat after fire for loss of hollows, logs, ground cover and connectivity.
  • Protect new plantings and retained habitat from stock, vehicles, unauthorised access and further soil disturbance.

Rehabilitation actions: Success measures and reporting

Set measurable rehabilitation targets for native plant establishment, ground-cover continuity, retained or reinstated logs, functioning nest boxes, weed cover, predator control and Agile Antechinus detections.

Monitor rehabilitation at intervals set by the approval and fauna management plan, using repeat trapping or nocturnal searches with comparable effort.

Report whether the site has regained forest structure and shelter resources, not only whether plants have survived.

  • Record trap nights, search hours, weather, fire history, vegetation condition, hollow and log condition, predator signs and all Agile Antechinus detections.
  • Investigate a failure to detect the species alongside habitat condition and survey effort before concluding that rehabilitation has failed or succeeded.
  • Adapt planting, weed control, log placement, nest-box maintenance or fire planning when monitoring shows that shelter and ground cover are not being restored.

Sources