Reptiles
Eastern Brown Snake
Pseudonaja textilis · also called common brown snake, brown snake
The eastern brown snake is Australia’s most dangerous snake to people — not the one with the strongest venom (that is the reclusive inland taipan), but the one that combines a near-record venom with speed, a short temper, and a habit of living exactly where Australians farm, garden, and build.
Overview
Eastern brown snakes are found across eastern and central Australia and into Papua New Guinea, and they are especially common in agricultural land, grassland, open woodland, and the margins of towns. They have benefited from European settlement: the introduced house mouse is their preferred food, and it swarms in and around farms, hay sheds, grain stores, and rubbish, so brown snakes concentrate in the same places people do. They are diurnal, active hunters, and shelter in disused burrows, under debris, in rock piles, and in building cavities.
Venom and danger
By the standard toxicity test, eastern brown venom is the second most toxic of any land snake, after the inland taipan. It is dominated by procoagulants that cause the blood to clot uncontrollably until the clotting system is exhausted, after which the victim can bleed catastrophically; neurotoxins and, sometimes, kidney injury follow. The snake delivers only a small volume and often a dry bite, so early symptoms can be misleadingly mild — then a person can collapse within minutes.
Despite all this, Australia records only about one or two snakebite deaths a year, and the eastern brown accounts for most of them mainly because of how often it meets people, not because it is impossible to survive. Effective antivenom and prompt hospital care save the great majority of victims.
Behaviour
Eastern brown snakes are fast and highly alert. Given space, one will flee. Cornered or trodden near, it raises the front of its body into a tight S-shape, sometimes with the neck flattened, and strikes forward quickly and repeatedly. A large share of bites occurs when someone tries to kill or capture the snake — the safest response to one is to stop, stand still or back away slowly, and let it leave.
Reproduction
Females lay a clutch of around 10 to 35 eggs in summer, often in a communal site such as a deep crack, a burrow, or under a large object, where several females may lay together. The hatchlings are fully venomous and independent, and disperse to hunt small lizards.
Status
The eastern brown snake is Least Concern, common, and probably stable or increasing in farmed landscapes. It is frequently killed on sight, which is both unnecessary — it plays a valuable role controlling rodents — and dangerous, since attempting to kill a brown snake is one of the commonest ways people get bitten. Snake-relocation services and simple property housekeeping (removing shelter and rodent food) are the recommended approach.
Eastern Brown Snake: common questions
Is the eastern brown snake the deadliest snake in the world?
It is often called that, but the phrasing matters. Its venom is the second most toxic of any land snake by laboratory measure, behind only the inland taipan. However, "deadliest" usually means how many people it actually kills, and there the eastern brown stands out for a different reason — it is common in the settled, farmed, and suburban parts of Australia, it is fast and easily provoked, and it defends itself readily. It causes the majority of Australian snakebite deaths — but the country still averages only one or two snakebite fatalities a year thanks to antivenom and good medical care.
Why does the eastern brown snake bite so many people?
Overlap and temperament. It thrives on farmland and around the edges of towns because the introduced house mouse — its favourite prey — is abundant there, so it lives in gardens, sheds, woodpiles, hay stacks, and paddocks where people work. It is also nervous and quick to react — disturbed at close range, it will rear into an S-shape, sometimes flatten its neck, and strike fast and repeatedly. Many bites happen to people trying to kill or move the snake.
What does an eastern brown snake bite do to you?
The venom is dominated by potent procoagulants that trigger uncontrolled blood clotting, rapidly using up the body's clotting factors so the victim can then bleed internally, including into the brain — collapse can happen within minutes. Neurotoxins that cause progressive paralysis and, in some cases, kidney damage follow. Because the snake injects so little venom, symptoms can be deceptively mild at first, so every suspected brown-snake bite is treated as an emergency with pressure-immobilisation first aid and rapid transport to hospital.
How can you tell an eastern brown snake from a harmless one?
It is genuinely difficult, which is a safety problem. Eastern brown snakes vary enormously in colour — pale tan, dark brown, grey, orange, or almost black, plain or banded or speckled — and can be confused with harmless species like the eastern small-eyed snake or various pythons and legless lizards, as well as with other dangerous species. The safe rule in Australia is to treat any brown or dark snake as potentially venomous, keep well back, and let it move away; identification is a job for experts, not something to attempt at close range.