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Collett’s Snake (Pseudechis colletti) is a venomous Australian elapid restricted to central inland Queensland’s black-soil plains. It is a robust, secretive snake recognized by irregular salmon-to-reddish bands on a dark body, a broad blunt head and a yellow-orange to cream belly. Although it is sometimes called the “Downs Tiger Snake,” it is a member of the black-snake genus Pseudechis, not the tiger-snake genus Notechis. The species is rarely seen, listed as Rare in Queensland by the Australian Museum, and should never be approached or handled.
This guide explains how to identify it, where it lives, what it eats, what is known about its reproduction, how its defensive behavior works and what to do if a snakebite is suspected.
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What is Collett’s Snake?
Collett’s Snake is the accepted common name for Pseudechis colletti, an Australian member of the family Elapidae. The Australian Government’s biodiversity taxon profile lists Pseudechis colletti as the accepted scientific name, and the Australian Society of Herpetologists’ official list corroborates that name. It belongs to Pseudechis, the genus commonly called the black snakes.
The nickname “Downs Tiger Snake” can cause confusion. It is a regional alternative name, not evidence that the animal is closely related to tiger snakes, which belong to Notechis. The Australian Museum specifically cautions against treating the two groups as close relatives.
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Collett’s Snake is a wild species, not a domesticated reptile. Its specialized range, venom and defensive behavior make it an animal to observe only from a safe distance. An apparent match to its color pattern is never a reliable basis for handling or for medical decisions after a bite.
What does Collett’s Snake look like?
Adults have a strongly built body and a broad, blunt head. The background color is dark brown to black, overlaid by irregular bands or patches that may be reddish, salmon-pink or red-brown. The head is generally uniformly dark, creating a noticeable contrast with the patterned body. The underside can range from yellow-orange to cream.
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The Australian Museum describes the average total length as about 1.5 metres. That figure is a total-length measurement, including the tail. Its largest measured male was recorded at 1,775 millimetres snout-to-vent length (SVL), a different measurement that stops at the cloaca and therefore should not be directly compared with a total-length figure. Adult males are larger on average than females.
| Feature | What the published profile reports |
|---|---|
| Scientific name | Pseudechis colletti |
| Average adult size | About 1.5 m total length |
| Largest named measurement | Male SVL of 1,775 mm |
| Body pattern | Irregular reddish or salmon bands and patches on dark brown or black |
| Head | Broad, blunt and generally uniformly dark |
| Belly | Yellow-orange to cream |
| Scale counts cited by the Australian Museum | 19 midbody scale rows; 215–235 ventral scales |
Scale counts are useful descriptive details in a formal species profile, but they are not a practical reason for a member of the public to approach or handle a snake. Counting scales requires close examination, and even a careful look at one feature cannot replace an expert identification.
Color can vary among individuals, and lighting, distance and seasonal conditions can alter what an observer sees. Photographs or memory are therefore insufficient for a confident field identification. If a snake is encountered, identification should never take priority over moving away safely.
Where does Collett’s Snake live?
Collett’s Snake has a narrow distribution in central inland Queensland. It is associated especially with warm-temperate to subtropical black-soil plains that can be seasonally inundated by monsoonal rain. The Queensland Government likewise describes it as restricted to central Queensland’s black-soil plains; it should not be presented as a snake found broadly across Australia.
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Within this landscape, the species shelters in deep cracks in the heavy soil, in gilgais (shallow depressions or sinkholes) and beneath fallen timber. These refuges provide cover in a region where rainfall and surface water can change markedly between seasons. The Australian Museum describes the snake as secretive and rarely seen, so an absence of sightings does not show that suitable habitat is unoccupied.
Its range is best understood as a habitat specialist’s distribution rather than a general “Queensland snake” range. Maps or reports that place it outside central inland Queensland should be checked against a reliable taxonomic or government source. The central Queensland focus also matters when considering comparisons: a species with a similar color pattern elsewhere may not share the same documented range.
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When is Collett’s Snake active?
The species is terrestrial, secretive and primarily diurnal. The Australian Museum also notes that it may be active on warm evenings. Activity is likely to be easiest to detect when temperatures and soil conditions allow the snake to leave its shelter, but the available profile does not provide a complete field study of seasonal activity or daily movement.
Because it spends much of its time concealed in cracks, gilgais or under timber, people can live or work in its range without seeing one. A snake emerging from cover is not necessarily pursuing a person; defensive behavior is more likely when it is cornered, touched or otherwise provoked.
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These observations do not support a dependable forecast of where or when an individual will appear. Diurnal activity does not mean it can only be encountered in daylight, particularly given the museum’s note about warm evenings. Treat any snake in suitable habitat cautiously rather than assuming a particular hour or season makes an encounter impossible.
What does Collett’s Snake eat?
Recorded wild prey includes mammals, lizards, other snakes and frogs. These are documented prey categories, not a quantified diet showing how frequently each category is eaten. The broad prey range is consistent with a predator capable of taking different vertebrates available on seasonally variable black-soil plains.
The list indicates that Collett’s Snake is not known only as a lizard-eater or only as a mammal-eater; several kinds of vertebrate prey have been recorded. It does not, however, establish the proportions of each prey type, how diet changes with age or season, or how often the snake feeds. Those specifics are not quantified in the cited species profile.
Do not infer a safe feeding practice or a captive diet from this list. The published information describes natural-history observations, not husbandry guidance, feeding schedules or a recommendation that this species be kept as a pet.
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Most of the breeding information summarized by the Australian Museum comes from captive animals, so it should not be treated as a comprehensive field study. The profile indicates that courtship and mating probably peak between August and October. Females are reported to lay seven to 14 eggs approximately 56 days after mating, usually from October to December.
Hatching may occur as long as 91 days later, with the interval varying according to incubation temperature. Those figures describe observations under captive conditions and should not be converted into a precise timetable for every wild female. The sources reviewed do not establish a field-derived study covering nest sites, mating frequency, juvenile survival or population-wide reproductive success.
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The distinction between an observed captive pattern and a universal wild schedule is important. For example, the reported 56-day interval is counted from mating to egg laying, while the potential 91-day interval concerns the time until hatching and varies with incubation temperature. They are separate stages, not a single fixed gestation period. The clutch range is a reported count, not an estimate of how many young survive in nature.
Is Collett’s Snake venomous?
Yes. Collett’s Snake is venomous, and a suspected bite is a medical emergency. Queensland Government information labels the species venomous, while South Australian clinical guidance includes Collett’s Snake in its discussion of potentially severe envenoming and antivenom treatment.
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Do not use a presumed species identification to decide whether medical care is needed or to reassure someone after a bite. The clinical guideline is intended for health professionals; for the public, the safe response is immediate medical assistance for any suspected snakebite. Do not wait for symptoms or attempt to establish the snake’s identity first.
What should you do if you encounter one?
Keep people and pets away, give the snake a clear escape route and leave the area without attempting to identify, move or kill it. Do not handle a snake to confirm its species, even if it appears injured or dead; a snake’s appearance alone cannot establish whether it is Collett’s Snake or another venomous species.
- Stop and increase distance. Back away slowly and keep children and animals behind you.
- Do not provoke it. Avoid touching, cornering, chasing, photographing at close range or striking the snake.
- Let it leave if possible. If it is inside a building or poses an immediate hazard, contact an appropriately qualified local wildlife or snake-removal service rather than attempting capture.
- After any suspected bite, seek emergency medical help immediately. Tell responders that a snakebite is suspected and follow the instructions of local emergency and clinical services.
Do not rely on a color-based identification, and do not substitute improvised treatments for professional care. The South Australian guideline is a clinical reference for health professionals; the general public should treat any suspected venomous snakebite as urgent and obtain emergency assistance.
For a sighting without a bite, the goal is separation, not a closer look. Leave the snake an unobstructed way to move away, and avoid creating a crowd around it. If it cannot safely be left where it is, seek help from a qualified local service. These precautions apply even if the animal appears calm, because apparent calm is not a guarantee that it will tolerate approach.
What is Collett’s Snake’s conservation status?
The Australian Museum profile lists Collett’s Snake as Rare in Queensland. That is a state-level listing in the profile. The sources used for this guide do not establish a current global or national conservation category, a named population estimate, a measured population trend or a quantified threat assessment. It would therefore be misleading to convert the Queensland listing into a broader claim about worldwide status.
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Its restricted distribution and dependence on black-soil plain habitat make accurate local records valuable. However, the available sources do not provide enough evidence to calculate abundance or to rank particular threats. Habitat observations should be reported through relevant Queensland wildlife authorities rather than used to justify handling or collecting animals.
“Rare in Queensland” should be read as the museum’s state-level description, not as a number of remaining snakes or a proof of a specific decline. No population figure or trend accompanies the listing in the cited profile. Keeping those distinctions clear avoids turning a useful conservation note into a claim more precise than the documented evidence.
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The most useful comparison points are scientific group, range, pattern, head shape, habitat and behavior. The Australian Museum notes a possible visual resemblance to a reddish-brown Blue-bellied Black Snake (Pseudechis guttatus), but says their known distributions generally do not overlap. That geographic distinction can be more informative than trying to match a single color patch.
| Comparison point | Collett’s Snake | Why it matters |
|---|---|---|
| Scientific group | Pseudechis colletti, family Elapidae | It is a black-snake relative, not a tiger snake of Notechis. |
| Geographic range | Central inland Queensland, especially black-soil plains | Known distributions help narrow an identification, but should not replace expert confirmation. |
| Pattern | Irregular salmon or reddish bands on dark brown or black | Distinctive overall, yet variable enough that color alone is unsafe. |
| Head and body | Broad blunt head; robust body; generally dark head | Use several features together rather than one visual cue. |
| Behavior | Secretive; may raise and inflate the forebody and hiss when provoked | A defensive display is a warning to retreat, not a diagnostic test. |
The comparison with the Blue-bellied Black Snake is specifically about possible visual resemblance and the generally non-overlapping known distributions. It does not establish that a snake seen in one place can be identified by range alone. Likewise, the word “black” in the common group name does not mean every individual is uniformly black: Collett’s Snake is known for its contrasting reddish or salmon pattern.
Never use a comparison chart to decide that a snake is harmless. In Australia, uncertainty should lead to distance and professional advice, not closer inspection.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What remains unknown about Collett’s Snake?
The species’ rarity and secretive habits mean that several basic questions remain incompletely documented. The reviewed sources do not provide a verified population size, a current population trend or a global conservation assessment. Nor do they establish a comprehensive field-based breeding study; the detailed clutch and timing figures come largely from captive observations.
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That evidence boundary matters. A precise number can look authoritative even when it applies only to a small captive sample or a particular incubation condition. The most defensible statements are therefore the ones tied to the named museum, government and clinical sources, with uncertainty made explicit where field data are limited.
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Key facts at a glance
- Name: Pseudechis colletti, an elapid in the black-snake genus Pseudechis.
- Range: Central inland Queensland, especially seasonally inundated black-soil plains.
- Appearance: A robust, dark-bodied snake with irregular reddish or salmon bands, a dark blunt head and a yellow-orange to cream belly.
- Size: About 1.5 m average total length; the largest cited male measurement is 1,775 mm SVL.
- Diet: Recorded prey includes mammals, lizards, snakes and frogs.
- Breeding evidence: Seven to 14 eggs, with timing and incubation figures derived mainly from captive observations.
- Conservation: Listed as Rare in Queensland by the Australian Museum; broader status is not established by the cited sources.
- Safety: Venomous. Keep away and seek immediate medical help for any suspected bite.
The Australian Museum calls Collett’s Snake “one of the most spectacularly-coloured snakes in Australia” and describes it as a shy, rarely seen inhabitant of Queensland’s black-soil plains. That combination—striking appearance, narrow habitat and a defensive venomous bite—explains why it belongs in a field guide, not in an amateur handling situation.
Sources
- Australian Museum species profile, updated 16 July 2026.
- Australian Government biodiversity taxon profile for the accepted name and classification.
- Queensland Government snake information for the Mt Isa region.
- SA Health Snakebite, Spiderbite & Marine Toxinology Guidelines.
- Australian Society of Herpetologists official species list (30 June 2022).
Frequently Asked Questions
Is Collett’s Snake the same as a tiger snake?
No. “Downs Tiger Snake” is an alternative local name, but Collett’s Snake is classified in the genus Pseudechis. Tiger snakes belong to Notechis, so the nickname should not be used to infer close relationship.
Can Collett’s Snake be kept as a household pet?
The cited natural-history sources do not provide husbandry guidance or establish suitability for private keeping. Because it is venomous and potentially capable of severe envenoming, it should not be handled as an ordinary pet; contact qualified wildlife authorities about any snake found near a home.
Why are Collett’s Snakes so rarely seen?
They are described as secretive and spend time in deep black-soil cracks, gilgais and beneath fallen timber. Their restricted habitat and concealment mean that people may occupy the same region without seeing one.
What months do Collett’s Snakes lay eggs?
The Australian Museum reports captive observations of laying usually from October to December, following a likely August–October mating peak. Those dates are not a complete field-based breeding calendar, and timing can vary.
What colors can a Collett’s Snake’s belly be?
The underside is reported as yellow-orange to cream. Color alone is not sufficient for identification, especially at a distance or in changing light, so observers should never approach a snake to inspect its belly.
The Bottom Line
Collett’s Snake is a distinctive but rarely seen inhabitant of central Queensland’s black-soil plains. Its appearance and natural history are fascinating, but its venom makes distance the only sensible approach: do not handle or provoke it, and seek emergency medical help immediately after any suspected bite.
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