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Chameleon Dragon (Chelosania brunnea)

The Chameleon Dragon, Chelosania brunnea, is a large Australian agamid and the only species in the genus Chelosania. It averages about 375 mm in length and is named for its chameleon-like appearance, not for colour change. The supplied sources provide little information on its distribution, habitat, breeding biology or shelter sites, so site assessments should rely on targeted local surveys and verified records.

Conservation status

Northern Territory, Territory Parks and Wildlife Conservation Act 1976: Near threatened.

Breeding season

Chelosania brunnea is an oviparous, diurnal reptile. Egg laying has been reported in July and August, but mating, incubation, hatchling emergence and seasonal adult activity are poorly documented. Clear burrowed ground and concealed shelter cautiously throughout the year, with the highest documented risk during July and August.

Reproductive mode: Oviparous, egg laying.

Clutch size: 2 to 9 eggs reported. Mean clutch size is 5 to 6 eggs, with up to 8 eggs also recorded.

Incubation: Not recorded.

Size at hatching: 36 mm snout to vent length and 1.48 g body mass.

Age at maturity: Not recorded.

Nest or egg sites: Burrows are reported as egg-laying sites. The available species account also records females going to the ground to lay.

Breeding frequency: Not recorded.

Confirm timing locally before works, because rainfall and temperature may affect movement, surface activity and egg laying, and the available records do not define regional variation.

  • Mating: No mating months are recorded for this species. Treat mating as possible throughout the year when planning works, pending local records.
  • Gravid females: Months when females carry eggs are not recorded. Treat gravid females as possible in all months, with additional care before and during the July to August egg-laying period.
  • Egg laying: Egg laying is reported between July and August. Females may move to the ground, and burrows are reported as egg-laying sites.
  • Incubation: Incubation length and hatching dates are not recorded. Treat eggs as potentially present in burrows after July to August laying, and inspect retained soil and burrowed ground before clearing.
  • Hatchlings: Hatchling emergence months are not recorded. Hatchlings are reported at about 36 mm snout to vent length and 1.48 g, so retain the precaution that young may be present after the documented July to August laying period.
  • Active period: Adults are diurnal, but no seasonal activity period is recorded. Plan for surface activity in all months and schedule searches during daylight.
  • Highest clearing risk: Risk is highest in July and August because egg laying is documented then and eggs may be placed in burrows. Clearing can also harm concealed animals, gravid females and unrecorded young in other months.

Identification

The Chameleon Dragon is a large agamid with a distinctive, chameleon-like appearance. Identification should focus on its overall form and the detailed scale and skin characters described below.

The species averages about 375 mm in length. It does not change colour, despite its common name. The body has loose skin, and the skin behind the tympanum is covered by tubercular scales arranged in five or six postero-dorsal rows, with deep fissures between the rows.

Average length: About 375 mm

Weight: Not reported in the supplied sources

Identification: Diagnostic features

The gular fold is very narrow in the middle of the throat. Femoral glands and their associated thigh pores are absent. The species has one more presacral vertebra than the usual 22 or 23 reported for most Australian agamids.

  • Check the narrow mid-ventral gular fold.
  • Check that femoral pores are absent.
  • Examine the tubercular scales behind the tympanum and their five or six separated rows.
  • Do not identify the species by colour change, because the chameleon reference describes appearance only.

Identification: Similar species and field signs

The supplied sources do not provide a comparison table with other Australian dragons or a reliable field key for separating this species from similar agamids. They also do not describe species-specific tracks, scats, calls, nests, sloughs or eyeshine.

  • Photograph the head, tympanum, throat fold, thighs and dorsal pattern where safe to do so.
  • Record the animal's total length or an accurate scale reference.
  • Do not treat an unconfirmed sighting as a Chameleon Dragon record without checking the diagnostic skin and pore characters.

Distribution: Known distribution

The supplied sources confirm the species as an Australian agamid but do not provide a state-by-state range, bioregional distribution or mapped stronghold.

No national range, state distribution or bioregional occurrence is given in the supplied documents. The material therefore does not support assigning the species to particular regions or strongholds.

  • Treat the absence of a published range in the supplied material as an information gap, not as evidence that the species is absent from a project area.
  • Check current Atlas of Living Australia records, state databases and local survey data before finalising a site assessment.

Distribution: Population information

No population estimate, subpopulation structure or population trend is reported in the supplied sources.

Population size: Not reported

Population trend: Not reported

Known strongholds: Not identified in the supplied sources

Habitat: Habitat information gap

Species-specific habitat information is limited in the supplied documents. The source material does not identify vegetation communities, elevation limits, climate limits or structural habitat requirements for Chelosania brunnea.

The supplied species account states that little information is available on the habitat of the Chameleon Dragon. No habitat type, vegetation association, elevation range or climatic boundary is given.

  • Map all vegetation types, mature trees, dense ground cover, fallen timber and rocky or concealed areas within the proposed disturbance footprint.
  • Retain location and habitat details for every sighting to improve local knowledge of habitat use.

Habitat: Agamid context

Australian agamids are generally sit-and-wait predators. This indicates that basking, lookout and ambush positions may be relevant to site use, but the supplied sources do not identify the structures used specifically by the Chameleon Dragon.

Foraging habitat: Feeding behaviour

The supplied documents do not describe the Chameleon Dragon's prey, feeding range or preferred foraging substrates. General information is available for Australian agamids.

Australian agamids generally feed by sitting and waiting for prey, then lunging to seize it with the jaws or tongue. They are described as opportunistic feeders rather than selective feeders.

  • Inspect likely lookout and ambush positions during surveys, including elevated or exposed points near ground cover.
  • Record the substrate, perch or cover associated with each observation because species-specific foraging habitat is not established in the supplied material.

Foraging habitat: Food

Ants form a large part of the diet of many Australian dragons, and other agamids also take other invertebrates. The supplied sources do not confirm the Chameleon Dragon's prey spectrum or identify key food plants.

Confirmed prey for Chelosania brunnea: Not reported

General agamid prey: Ants and other available invertebrates

Foraging range: Not reported

Breeding habitat: Breeding biology

No species-specific breeding season, clutch size, incubation period, maturity age or lifespan is provided in the supplied sources.

The supplied documents do not describe mating, egg laying, nests, incubation, hatchlings or parental care for the Chameleon Dragon.

Breeding season: Not reported

Clutch size: Not reported

Gestation or incubation: Not reported

Age at maturity: Not reported

Lifespan: Not reported

Breeding habitat: Breeding habitat requirements

No breeding habitat features are identified for this species. The supplied material does not confirm whether it uses soil nests, tree hollows, fallen timber, rock crevices or other specific sites.

  • Treat undisturbed ground, loose soil, cover and concealed sites as potential breeding habitat until local survey data show otherwise.
  • Use pre-clearance searches and qualified spotter catcher procedures where individuals or suitable habitat are present.

Sheltering habitat: Known shelter sites

The supplied sources do not describe refuges, burrows, hollows, rock crevices, sheltering vegetation or refuge dimensions for Chelosania brunnea.

No species-specific sheltering habitat is reported. There are no documented sizes for burrows, hollows, crevices or other refuges.

Burrow size: Not reported

Hollow size: Not reported

Known refuge type: Not reported

  • Search beneath and within ground cover, fallen timber, dense vegetation and other concealed structures during targeted surveys.
  • Inspect material that will be moved or removed before clearing, because the species' shelter use is not well documented.
  • Record the exact refuge type whenever an animal is found sheltering.

Sheltering habitat: Survey interpretation

The absence of a detected animal does not demonstrate that concealed habitat is unused. The species account describes it as rarely encountered, and the available habitat information is limited.

  • Combine active searches with habitat inspection and repeat surveys where clearing is proposed.
  • Retain habitat records even when no animal is found, because they can support future local assessments.

Threats: Habitat loss and fragmentation

The supplied sources identify habitat loss, climate change and feral predators as threats to Australian dragons generally. They do not provide a species-specific threat assessment for the Chameleon Dragon.

Habitat loss is identified as a threat to Australian dragons. Clearing, construction and infrastructure works can remove or divide habitat, but the supplied sources do not quantify the Chameleon Dragon's response or identify priority habitat elements.

  • Avoid unnecessary clearing and retain connected native vegetation wherever practicable.
  • Stage clearing after pre-clearance searches and fauna handling arrangements are in place.
  • Keep records of all individuals, refuges and habitat features affected by the works.

Threats: Predators and climate

Feral foxes and cats are identified as predators affecting Australian dragons generally. Climate change is also identified as a broad threat. No species-specific evidence is supplied for predation rates, disease, fire effects, road mortality or hydrology change.

  • Control or manage feral predator access where this forms part of the approved project controls.
  • Record road-killed or injured animals and report them through the relevant state or territory system.
  • Do not infer that disease, altered fire or hydrology is a confirmed species-specific threat without local evidence.

Threats: Evidence gaps for project planning

The supplied documents do not provide thresholds for clearing distance, fragmentation, fire frequency, road impacts, disease, hydrology change or translocation. Project controls should therefore be based on current state or territory requirements and site-specific ecological advice.

Survey methodology: 1. Diurnal visual searches

The supplied documents contain no species-specific survey guideline or prescribed effort for the Chameleon Dragon. Use a targeted, repeatable search that reflects its status as an Australian agamid and record enough information to support an absence decision.

Search retained vegetation, ground cover, tree trunks, posts and other basking surfaces during daylight, because agamids commonly use sit-and-wait hunting behaviour and may remain still until approached.

Use parallel transects or fixed-area searches across all proposed disturbance areas and nearby retained habitat, and record the route, search area, start and finish times, weather, observers and detection conditions.

Inspect both sides of habitat edges and connected retained areas, because habitat loss and fragmentation are identified threats to Australian dragons.

  • Repeat searches on separate suitable days rather than relying on one inspection.
  • Approach slowly and scan for a stationary lizard before disturbing vegetation or ground cover.
  • Record all sightings, including animals identified only to genus or family, with photographs where this can be done without handling the animal.

Survey methodology: 2. Spotlighting and evening searches

Add evening spotlighting where daytime searches are limited by dense vegetation, heat or poor visibility, but treat this as supplementary because the supplied documents do not establish nocturnal activity for the Chameleon Dragon.

Walk or drive fixed routes at a controlled speed through the disturbance area and adjacent retained habitat, recording the route, duration, weather and animals detected.

Do not infer absence from a single unsuccessful night, because the supplied material provides no species-specific detection probability or night survey effort.

  • Use the same routes and search duration on each repeat visit so results can be compared.
  • Avoid excessive approach or light exposure that could cause an animal to flee into machinery access areas.
  • Coordinate spotlighting with the fauna spotter catcher and exclude active work zones from the survey area.

Survey methodology: 3. Habitat and incidental searches

Search likely shelter and observation sites during pre-clearance inspections, including dense shrubs, ground debris, tree bases, retained trees, artificial structures and the margins of connected vegetation.

Inspect habitat features before they are moved or removed, because agamids may remain concealed and the Chameleon Dragon has mobile skin around the neck that can allow body distension.

Use photographs, GPS locations and a clear identification check for all suspected Chameleon Dragons, which is the only member of the Chelosania genus.

Indicative adult length reported by CSIRO: Average length of 375 mm

Genus: Chelosania, the only member of the genus

  • Do not turn logs, rocks or other cover with machinery before the spotter catcher has inspected the feature.
  • Treat a suspected animal as a Chameleon Dragon until an authorised person confirms another identification.
  • Record the feature type, condition, surrounding vegetation and whether the animal was basking, sheltering or moving.

Survey methodology: Minimum effort and reporting

No minimum nights, hours, trap nights, transect length or search density are specified in the supplied documents, so set and justify effort in the project fauna management plan using the disturbance footprint, habitat quality, access and detection conditions.

  • Survey the entire disturbance footprint and all habitat that may be affected indirectly by access, machinery movement, noise, dust, lighting or changed drainage.
  • Use more than one survey period where the first search is affected by rain, high wind, extreme heat, poor visibility, dense cover or active construction.
  • Submit confirmed records and suitable photographs to the relevant Northern Territory or other state wildlife database, as applicable to the project location.
  • Report the date, observer, coordinates, identification basis, habitat, survey method, effort, weather and outcome for every search.
  • Retain negative survey results and explain the method and conditions that produced them.

Before habitat disturbance: Avoid and minimise

Avoid disturbance first, then limit the area and duration of unavoidable works. The Chameleon Dragon is an Australian agamid affected by habitat loss and feral predators, so retain connected habitat and prevent avoidable escape or injury during clearing.

Redesign the footprint where practicable to retain occupied sites, connected vegetation, mature trees, dense cover and other features used by the animal for shelter, observation or movement.

Keep retained habitat connected to nearby vegetation rather than leaving isolated patches, because habitat loss is identified as a threat to Australian dragons.

Do not clear outside the approved footprint, and use a clearly marked no-go area around retained habitat.

  • Mark the clearing boundary, access tracks, stockpile areas and retained habitat before machinery arrives.
  • Keep lighting, dust, noise, vehicle movement and drainage changes away from retained habitat where practicable.
  • Control feral cats and foxes through the project’s approved pest management measures, because these predators are identified threats to Australian dragons.

Before habitat disturbance: Approvals and planning

Confirm the current EPBC Act and state or territory conservation status before works begin, and obtain any required approvals, permits and fauna handling authorisations.

Prepare a fauna management plan that names the authorised spotter catcher, sets out search and handling procedures, identifies release habitat and defines stop-work triggers.

Stage clearing so that fauna can move into retained habitat before the next section is opened, while preventing movement into active work areas.

  • Confirm whether the project requires an EPBC referral or approval and whether state or territory approval applies.
  • Confirm that the spotter catcher is authorised for the species and work location before clearing starts.
  • Brief all workers on the exclusion zones, discovery procedure, speed limits, no-go areas and incident contacts.

Before habitat disturbance: Site preparation

Complete a pre-clearance inspection immediately before disturbance, even where an earlier ecological survey found no Chameleon Dragons.

Mark habitat features that require inspection or controlled removal, including trees, logs, rocks, dense shrubs, ground debris and artificial structures.

Install exclusion fencing where it can prevent entry into retained habitat or direct animals away from machinery, but do not use fencing that traps animals within the clearing zone.

  • Check exclusion fencing each day for gaps, undercut sections and trapped fauna.
  • Remove rubbish, stored materials and avoidable refuges from active work areas before machinery starts.
  • Confirm that the release area is nearby, safe, connected to retained habitat and outside the next work stage.

During habitat disturbance: Daily controls and machinery interface

Clearing must proceed under continuous fauna supervision. The spotter catcher controls the sequence of work, checks habitat before removal and has authority to pause machinery when an animal or unsearched feature is encountered.

Hold a daily pre-start briefing covering the day’s clearing limits, habitat features, spotter catcher location, communications and stop-work procedure.

Clear in small, defined stages from the disturbed area towards retained habitat, allowing the spotter catcher to inspect the next section before machinery enters it.

Keep machinery at walking pace during initial vegetation removal and maintain direct communication between the operator and spotter catcher.

  • Stop machinery immediately when the spotter catcher signals, loses visual contact with the work face or identifies an unsearched feature.
  • Keep workers, vehicles and dogs away from the animal and its release route.
  • Do not resume work until the spotter catcher confirms that the area is clear or the animal has been safely managed.

During habitat disturbance: Feature inspection and handling

Inspect trees, logs, rocks, dense vegetation, ground debris and artificial structures before removal or relocation, because agamids may shelter in cover and the supplied material does not define a single Chameleon Dragon refuge type.

Use a controlled, staged removal method for features that may conceal an animal, with the spotter catcher positioned safely and able to see the work face.

Retain suitable features in connected habitat where safe and consistent with the approved design.

  • Do not crush or drag an uninspected log, rock, tree base or vegetation clump with machinery.
  • Do not place removed habitat features in piles that block fauna movement or create an unsearchable work area.
  • Treat hollow-bearing trees, burrows and nests according to the project fauna management plan and any approval conditions, even though the supplied documents do not identify them as Chameleon Dragon specific habitat.

During habitat disturbance: Animal response and stop-work triggers

If a Chameleon Dragon is found, stop work around the animal and allow the authorised spotter catcher to assess whether it can move safely into retained habitat.

Handle the animal only when necessary to prevent injury or when required by the approved fauna procedure, and use an appropriately authorised person.

Move the animal only to nearby, suitable retained habitat that is outside the disturbance footprint and away from immediate machinery hazards.

  • Do not chase, restrain or pass the animal between untrained workers.
  • Keep the animal shaded, quiet and secure for the shortest practical time if temporary containment is authorised.
  • Take an injured animal to a veterinarian or authorised wildlife carer as soon as practicable.
  • Stop work if an animal is injured, trapped, repeatedly encountered in the work face, found outside the approved relocation area or cannot be safely moved.
  • Record the species, location, time, condition, action taken, release location, handlers and photographs where appropriate.

After habitat disturbance: Post-clearance inspection

Post-clearance checks must confirm that no fauna remains in the work area, that retained habitat controls are intact and that all discoveries and incidents have been reported.

Have the spotter catcher inspect the cleared area, debris piles, machinery exclusion zones and retained habitat edges before the area is handed back to construction staff.

Recheck any feature that was partly removed, shifted, damaged or left near the clearing boundary.

Search adjoining retained habitat for animals displaced by clearing and record any confirmed sightings.

  • Do not release the area for unrestricted construction until the spotter catcher signs off the inspection.
  • Remove or secure materials that could trap fauna, including open pipes, pits, drains and containers.
  • Repair exclusion fencing and cover or barricade hazards before workers leave the site.

After habitat disturbance: Monitoring and reporting

Monitor retained habitat and release areas at the frequency set in the fauna management plan, with additional checks after major clearing stages or reports of fauna movement into work areas.

Review records for repeated sightings, injuries, mortality, failed relocations or movement towards machinery and change the work method if those patterns occur.

Report confirmed records, incidents and any required compliance information to the relevant project authority and wildlife database.

  • Keep a register of survey effort, sightings, handling, relocation, injury, mortality, complaints and corrective actions.
  • Map retained habitat, release points and all animal records so later work stages can avoid known activity areas.
  • Escalate any unexpected concentration of animals or repeated mortality to the project ecologist and approval authority.

After habitat disturbance: Controls and offsets

Maintain no-go areas, fencing, speed controls and predator management for as long as they are required by the fauna management plan and approval conditions.

Apply offsets only where residual impacts remain after avoidance and minimisation, and confirm the offset requirement with the relevant approval authority.

Use the post-clearance results to refine later work stages rather than treating the initial survey as a permanent clearance.

  • Inspect and document retained habitat controls after each construction stage.
  • Remove temporary controls only after the responsible ecologist confirms that they are no longer needed.
  • Record the basis for any offset decision and link it to the approved impact assessment.

Rehabilitation actions: Restore structure and connectivity

Rehabilitation should restore connected cover and reduce the project’s long-term exposure of Chameleon Dragon habitat. The supplied documents do not identify a preferred plant list, nest box design or fire interval for this species, so restoration must be based on the pre-clearing vegetation community and local ecological advice.

Re-establish the local native vegetation community using species and densities matched to the pre-disturbance site, rather than planting a generic dragon habitat mix.

Reconnect retained vegetation across cleared edges and around release areas where this is consistent with the approved design.

Retain or reinstate safe ground cover, logs, rocks and other natural shelter features identified during the pre-clearance survey.

  • Use locally appropriate native plant stock and protect new plantings from grazing, vehicles and compaction.
  • Place reinstated logs and rocks so they provide cover without creating access or fire hazards.
  • Do not introduce structures such as nest boxes unless monitoring shows a need and the design is approved by the project ecologist.

Rehabilitation actions: Threat and disturbance management

Control weeds so native cover can establish and continue to provide connected habitat.

Manage feral cats and foxes in accordance with approved local programs, because these predators are identified threats to Australian dragons.

Develop fire management with local land managers and ecologists, using the pre-clearing vegetation community and site-specific fire risk rather than an unsupported species-specific interval.

  • Prevent new weed infestations through clean-down procedures, follow-up treatment and weed monitoring.
  • Keep rehabilitation areas free from construction access, dumped materials and unnecessary night lighting.
  • Maintain drainage and erosion controls so rehabilitation areas do not become degraded or disconnected.

Rehabilitation actions: Success measures and monitoring

Monitor plant establishment, ground cover, weed cover, connectivity, shelter features and use of rehabilitated habitat at intervals set in the rehabilitation plan.

Use repeatable fixed points, transects or fixed-area searches to compare rehabilitation with retained reference habitat.

Treat a confirmed Chameleon Dragon record as useful evidence of habitat use, but do not use absence alone as the success measure because the supplied documents provide no species-specific detection probability.

Species group: Australian agamid, family Agamidae

Known threat relevant to rehabilitation: Habitat loss and feral predators, including foxes and cats

  • Set measurable completion criteria for native plant survival, weed control, erosion, shelter feature retention and access control before rehabilitation begins.
  • Inspect after major rainfall, fire, pest treatment and maintenance works.
  • Report monitoring results, failed criteria and corrective actions to the project authority and relevant wildlife database where species records are obtained.

Sources