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Species Profile

Collett’s Snake

Pseudechis colletti

Banded black snake of inland Queensland
760521256/Shutterstock.com

Collett’s Snake Distribution

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Endemic Species
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collett’s snake on branch

At a Glance

Wild Species
Diet Carnivore
Activity Crepuscular+
Lifespan 10 years
Status Least Concern
Did You Know?

Adults are typically ~1.2-1.8 m total length; large individuals approach ~2.0 m (field guides compiled from museum/collector records; e.g., Wilson & Swan, 2021).

Scientific Classification

Collett's snake (Pseudechis colletti) is a venomous Australian elapid commonly referred to as Collett's black snake. It is part of the genus Pseudechis (the Australian black snakes).

Kingdom
Animalia
Phylum
Chordata
Class
Reptilia
Order
Squamata
Family
Elapidae
Genus
Pseudechis
Species
Pseudechis colletti

Distinguishing Features

  • Venomous elapid (front-fanged)
  • Member of Australian 'black snakes' genus Pseudechis
  • Often described as a dark snake with contrasting lighter markings/banding (pattern can be variable)

Physical Measurements

Length
5 ft 11 in (3 ft 11 in – 8 ft 2 in)
Venomous

Appearance

Primary Colors
Secondary Colors
Skin Type Dry reptilian skin with smooth, glossy overlapping scales (typical of Australian black snakes; sheen is often noted in live animals).
Distinctive Features
  • Venomous Australian elapid ("black snake" group) with distinctive red to pink crossbands on an otherwise black back, helping distinguish it from more uniformly dark black snake species.
  • Adult size: commonly ~1.5-2.0 m total length; maximum reported around ~2.5 m total length in published species summaries/field references (e.g., Australian reptile field guides and compiled databases such as the Australian Reptile Online Database).
  • Build: robust-bodied with a moderately distinct head and relatively small eyes typical of many elapids; tail tapers evenly.
  • In inland Queensland arid to semi-arid areas (cracking clay plains, grasslands, shrublands), Collett's snake hides in soil cracks, debris, or burrows, so its glossy back often looks dusty or matte.
  • Behavior relevant to appearance: when threatened, may elevate the forebody and adopt a striking posture; the neck may flatten slightly (a defensive display reported for Australian black snakes), making the banding more conspicuous.
  • Collett's snake (Pseudechis colletti): wild life span is not well known. In captivity they often live about 10–15 years, but exact maximum ages are not always published.

Sexual Dimorphism

Sexual dimorphism in Collett's snake is not clearly documented; males and females are generally described as similar in coloration and pattern, and standard species accounts do not report consistent sex-specific external differences.

♂
  • Typically proportionally longer tail (post-cloacal length) than females, consistent with hemipenes accommodation in male snakes.
  • May appear slightly more slender at a given total length in some populations, though overlap is substantial.
♀
  • Often attain greater body girth and may average slightly larger in snout-vent length in some snake species; for P. colletti, size dimorphism is not strongly emphasized in most field accounts and may vary with sample/population.

Did You Know?

Adults are typically ~1.2-1.8 m total length; large individuals approach ~2.0 m (field guides compiled from museum/collector records; e.g., Wilson & Swan, 2021).

It's an egg-layer (oviparous); reported clutches are commonly in the high single digits to teens (e.g., ~5-18 eggs reported in Australian elapid summaries; Wilson & Swan, 2021).

Unlike the "all-black" look of some relatives, it often shows bold orange-to-red crossbands on a dark body-especially noticeable in good light.

Diet is strongly reptile-focused: lizards and other snakes are important prey, consistent with many Pseudechis species' tendency toward ophiophagy (snake-eating) (summarized in Shine, 1980s-1990s elapid ecology literature).

Its venom is medically significant and is characterized by prominent myotoxic effects (muscle damage) typical of several Pseudechis species; severe systemic effects can occur after envenoming (clinical/toxinology syntheses; e.g., Isbister & colleagues on Australian snakebite syndrome patterns).

It's an arid/semi-arid specialist, most often associated with inland Queensland plains and woodlands, sheltering in deep cracks, burrows, and ground debris during extremes.

Within genus Pseudechis, "black snakes" span very different habitats-from wet-coast rivers (red-bellied black snake, P. porphyriacus) to the arid interior (mulga snake, P. australis)-yet share a generally robust build and potent venoms.

Unique Adaptations

  • Arid-zone sheltering strategy: effective use of deep soil cracks and burrows provides a stable microclimate (temperature/humidity buffering) in semi-arid inland Queensland.
  • Myotoxic venom profile: venom effects that rapidly impair muscle function can be advantageous for subduing robust reptile prey; strong myotoxicity is a hallmark across multiple Pseudechis species (toxinology/clinical literature).
  • High-contrast banding: the dark body with reddish banding likely functions as a warning (aposematic) signal at close range and can visually break up the body outline in dappled ground shade.
  • Robust, glossy scales: like other "black snakes," it has a stout build and relatively smooth scalation that helps it move efficiently through ground debris and tight crack systems.

Interesting Behaviors

  • Thermal timing: in hot arid country it commonly shifts activity toward cooler parts of the day (morning/late afternoon) and uses deep retreats (cracking clays, burrows) to avoid lethal surface temperatures.
  • Defensive display: when threatened it may elevate the forebody, flatten the neck region, and hiss-typical elapid warning behavior-before striking if pressed.
  • Active foraging: rather than strict ambush, it often moves through ground cover searching for reptile prey, including other snakes.
  • Refuge fidelity: individuals may repeatedly use the same shelter networks (soil cracks/burrows) across days when conditions stay suitable, a pattern reported broadly in studies of Australian elapids in arid landscapes.
  • Seasonality: surface activity tends to track rainfall/temperature; in cooler periods it may remain hidden for extended intervals, reducing exposure and water loss.

Cultural Significance

Collett's snake (Pseudechis colletti) is part of Australia’s black snakes, seen as powerful, dangerous and respected in rural areas. Named for scientist Robert Collett and described in the late 1800s, it is used in safety lessons about inland venomous snakes and the need to keep arid habitats undamaged.

Myths & Legends

Across many Aboriginal nations, Rainbow Serpent stories tell of a great water serpent that shapes land, carves rivers and enforces law. Not about Collett's snake specifically, these myths show snakes as ancestral powers.

At Ayers Rock, a Dreaming story tells of a python woman and a venomous snake man (Collett's snake, Pseudechis colletti) who left marks on the rock and teach kinship, payback, and sacred duty.

In Southwest Western Australia stories, a creator serpent is said to have made rivers and wetlands; its presence explains why some waterways are sacred and what happens if people disrespect them—a key creator-serpent tradition.

Conservation Status

LC Least Concern

Widespread and abundant in the wild.

Population Unknown

Protected Under

  • Australia (general): Native wildlife is protected under state/territory legislation; this species is treated as protected fauna where it occurs.
  • Queensland: Nature Conservation Act 1992 (protected wildlife provisions apply to native reptiles, including venomous snakes).
  • Commonwealth (Australia): Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act) provides a framework for protecting native species and matters of national environmental significance; P. colletti is not listed as a threatened species under the EPBC Act.
  • HUBS (Genus Pseudechis / 'black snakes') conservation landscape: Across the group, most assessed species are listed as Least Concern on the IUCN Red List, while some taxa may be Not Evaluated depending on the authority/source used. Common pressures where they overlap with people include habitat modification (especially rangeland change and altered fire), persecution, and road mortality; localized impacts from mining/infrastructure occur in parts of inland Australia. No Pseudechis species is widely recognized as globally threatened (VU+) on the IUCN at present, but some populations can face strong local pressures.

Life Cycle

Birth 12 hatchlings
Lifespan 10 years

Lifespan

In the Wild
6–15 years
In Captivity
10–20 years

Reproduction

Mating System Polygynandry
Social Structure Solitary
Breeding Pattern Transient
Fertilization Internal Fertilization
Birth Type Internal_fertilization

Few studies on Pseudechis colletti mating exist; habits are inferred from related Pseudechis. P. colletti is solitary except in breeding season. Males find females by pheromones, briefly mate by internal fertilization (hemipenes). No pair bond or parental care.

Behavior & Ecology

Social None (no stable group) Group: 1
Activity Crepuscular, Nocturnal
Diet Carnivore lizards (particularly skinks)
Seasonal Hibernates

Temperament

Generally shy and avoids confrontation; typically retreats when given opportunity (not a gregarious or overtly social species).
Defensive when cornered or handled: may flatten the body/neck region, adopt an alert S-shaped striking posture, and strike if provoked; medically significant venom typical of elapid defensive behavior.
Seasonal/thermal variation: activity and defensiveness can increase during warm evenings/nights and during breeding movements; individuals may be more detectable and reactive under heat stress or when surprised at close range.

Communication

Hissing Expelled-air hiss as a defensive warning; snakes lack vocal cords
Chemical communication via pheromones and scent trails detected by tongue-flicking and the vomeronasal organ Mate searching/sex recognition is primarily chemosensory
Tactile communication during courtship and mating Body contact, alignment, cloacal contact
Visual/behavioral displays in defense: body flattening, elevated forebody, head/neck posture; these serve as threat signals to deter predators.
Male-male ritual combat (where observed in Pseudechis): intertwined bodies and pushing contests function as agonistic signaling without feeding-related cooperation.
Vibration/substrate cues: close-range detection and signaling through movement in leaf litter/soil during approach or retreat Non-vocal, incidental but behaviorally relevant

Habitat

Biomes:
Savanna Temperate Grassland Tropical Dry Forest Desert Hot
Terrain:
Plains
Elevation: Up to 2296 ft 7 in

Ecological Role

Terrestrial mesopredator in semi-arid grassland/woodland systems of inland Australia.

Regulates populations of small reptiles (notably skinks) and other small vertebrates through predation Contributes to trophic transfer by converting small-vertebrate biomass into prey for higher predators (e.g., raptors and larger snakes) Can influence local snake-community dynamics through intraguild predation (predation on other snakes)

Diet Details

Main Prey:
Lizard Snakes Small mammals Frogs

Human Interaction

Domestication Status

Wild

Collett's snake (Pseudechis colletti) is a wild Australian snake with no domestication history. People mostly meet it by chance in the field; bite cases are rare. It is kept in licensed zoos, universities, and venom labs for teaching, research, and antivenom work. Encounters occur mainly in remote rangeland, causing persecution, road deaths, rescues, and handling by catchers and herpetologists.

Danger Level

High
  • Medically significant envenomation typical of black snakes (genus Pseudechis): local pain and swelling plus systemic effects that can include myotoxicity (muscle injury/rhabdomyolysis) and coagulation abnormalities; severe cases can be life-threatening without prompt medical care.
  • Occupational risk for snake handlers, field biologists, and venom-lab personnel; general public risk is lower because the species is primarily encountered in rural/remote parts of inland Queensland (Australia).
  • Handling/escalation risk: like other elapids, defensive bites are most likely when the snake is threatened, restrained, or accidentally stepped on.

As a Pet

Not Suitable as Pet

Legality: Keeping Collett's snake (Pseudechis colletti) is usually restricted. In Australia permits and experience are often required; elsewhere laws vary and many places ban venomous pets. Secure, inspected venomous housing is needed.

Care Level: Expert Only

Purchase Cost: $200 - $1,000
Lifetime Cost: $5,000 - $25,000

Economic Value

Uses:
Medical/toxinology research Public education (zoos, outreach) Antivenom/clinical training support (via venom supply from licensed programs) Ecosystem services (predation on pest species)
Products:
  • venom samples for research (regulated, institutional)
  • educational display/programming
  • scientific publications/data used in clinical management of envenoming

Relationships

Predators 5

Wedge-tailed eagle Aquila audax
Brown falcon Falco berigora
Laughing kookaburra
Laughing kookaburra Dacelo novaeguineae
Yellow-spotted monitor Varanus panoptes
Feral cat
Feral cat Felis catus

Related Species 9

Red-bellied black snake
Red-bellied black snake Pseudechis porphyriacus Shared Genus
Spotted black snake Pseudechis guttatus Shared Genus
Mulga snake
Mulga snake Pseudechis australis Shared Genus
Butler's black snake Pseudechis butleri Shared Genus
Papuan black snake Pseudechis papuanus Shared Genus
Tropical black snake Pseudechis weigeli Shared Genus
Taipan
Taipan Oxyuranus scutellatus Shared Family
Inland taipan
Inland taipan Oxyuranus microlepidotus Shared Family
Death adder
Death adder Acanthophis antarcticus Shared Family

“This snake is one of the most venomous in the world.”

Collett’s snakes, which are a species of black snakes, primarily live in Queensland, Australia, which allows them to be protected by law. This black snake species ranks within the top 20 most venomous snakes in the entire world, and anyone bitten must get treatment with antivenom.

Their reproduction typically occurs in the summertime, taking 91 days for the eggs to hatch after fertilization. However, they sometimes stay in their shell for an additional 12 hours after hatching.

5 Amazing Collett’s Snake Facts

  • The closest relative to Collett’s black snake is the blue-bellied black snake.
  • The diet of Collett’s snake is carnivorous, primarily feeding on small mammals, reptiles, and amphibians. Though they primarily like to eat local geckos, their diet has been known to include others of their own species.
  • During reproduction, one clutch of the Collett’s snake consists of up to 20 eggs. They are fairly easy to breed in captivity.
  • The typical reproductive season for the Down’s tiger snake starts between August and October. However, the female doesn’t lay her eggs until nearly two months later, taking an additional three months to hatch.
  • During reproduction, the male will crawl on the female’s back, even when newly introduced. It takes up to 6 hours to complete copulation.

Where to Find Collett’s Snakes

The only place Collett’s snakes appear to live is in central-western Queensland in Australia. They are diurnal, which means that the easiest time to spot them during their waking hours is the daytime. They prefer a habitat with plains and other dry or barren regions, though they’ll also live in subtropical climates, shrublands, and low woodlands. Their bright body makes them easy to spot, but their venom should keep you at a healthy distance.

Sometimes, these snakes can be found in trees that provide them with shelter. They’ll seek out homes that have already been prepared by other snakes in trees or on the ground.

Collett’s Snake Scientific Name

The Collett’s snake, which is also called Collett’s black snake, Collett’s cobra, or Down’s tiger snake, has the scientific name Pseudechis colletti. Rather than being Latin or Greek in origin, its name honors Robert Collett, who was a Norwegian zoologist.
This cobra species is of the Elapidae family under the Reptilia class.

Collett’s Snake Population & Conservation Status

So far, the official population of this black snake has not been recorded, but their numbers in captivity are quite high in Victoria. According to the IUCN RedList, the conservation status of Collett’s snake is Least Concern, but all Australian snakes are protected by federal law.

How to Identify Collett’s Snakes: Appearance and Description

Collett’s snake on rocks.

Collett’s snakes just want to be left alone

There is no other species of black snake that is quite as colorful as the Collett’s snake, which makes them incredibly easy to identify. With the upper body colored in dark brown to black, there is a banded pattern in a red to pink hue along the body. Though the head is fairly dark, the tip of their snout is often slightly lighter. Their eyes are always dark brown, encircled by a reddish-brown rim. They have a total of 19 rows of midbody scales with 215-235 ventricle scales.

Juvenile Collett’s cobras are fairly similar in their color pattern, but their brighter colors cause a much starker contrasts in the varied colors. Their physical shape is much like the red-bellied black snake until they are older. When they are born, these snakes are just under a foot long, but they’ll eventually measure 5.9 to 7.2 feet long when they reach adulthood.

How to identify a Collett’s snake:

  • Black to brown body with colorful pink or red banding.
  • 19 rows of midbody scales.
  • Brown eyes with a reddish-brown circle around the iris.
  • Dark head with a lighter snout.
  • Up to 7.2 feet in length as an adult, just under 1 foot in length as a juvenile.

Collett’s Snake Venom: How Dangerous Are They?

Collett’s snake is extremely venomous, ranking 19th in the world among all venomous snakes. One bite can be fatal, even though it was once thought only to be a minor threat. This lack of information led researchers to learn more, discovering that their venom is directly associated with rhabdomyolysis and acute kidney injury, creating a similar effect to that of a mulga snake. One bite releases about 30 mg of venom, which is cytotoxic.

You might’ve already been bitten by Collett’s snake if you experience nausea, vomiting, abdominal pain, diarrhea, or a headache. If you have been bitten, you need to seek out medical attention within 24 hours to get antivenom specific to black snakes and fluid replacement. Otherwise, you are at risk of rhabdomyolysis, acute kidney injury, or death.

Until help arrives, you should apply pressure to the bitten area and create a tourniquet to prevent the venom from spreading to the rest of your body through the bloodstream. According to the Australian Museum, it shouldn’t restrict blood flow, but it should inhibit movement to keep you still. Keep the bandage on until you reach a hospital.

Collett’s Snake Behavior and Humans

Even though Down’s tiger snakes are bright and beautiful, they are nearly impossible to randomly stumble upon. In fact, the only place you might ever see them is in a zoo or from a breeder because they are routinely sold in captivity as pets. They are neither friendly nor aggressive; they simply want to be left alone whether they are on the ground or in a tree.

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Sources

  1. https://en.wikipedia.org/wiki/Collett%27s_snake
  2. https://australian.museum/learn/animals/reptiles/colletts-snake/
  3. http://www.venomousreptiles.org/articles/44
  4. https://www.iucnredlist.org/species/42493229/42493233
  5. https://environment.des.qld.gov.au/wildlife/animals/living-with/snakes/near-you/mt-isa-region
Austin S.

About the Author

Austin S.

Growing up in rural New England on a small scale farm gave me a lifelong passion for animals. I love learning about new wild animal species, habitats, animal evolutions, dogs, cats, and more. I've always been surrounded by pets and believe the best dog and best cat products are important to keeping our animals happy and healthy. It's my mission to help you learn more about wild animals, and how to care for your pets better with carefully reviewed products.
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Collett’s Snake FAQs (Frequently Asked Questions)

Yes. This Australian snake species is incredibly venomous, ranking the 19th-most venomous snake in the world.