The real reason: Why did Australia end up with 20 of the world's most deadly venomous snakes and how did this happen?

From travel enthusiasts to residents of Australia, there are few topics that always make it to the most interesting campfire stories and it majorly revolves around Australia's terrifyingly toxic reptiles and creepy crawlers. In fact, for decades, Australia’s wildlife statistics have repeatedly warned the locals and travelers about the scary and venomous snakes. While this may sound creepy, Australia is home to 20 of the world’s 25 most venomous land snakes. But do you know how this happened and why there are 20 types of venomous snakes in Australia? Read on to find out....The scary situationFrom crawling around the backyard to hiding inside the house, Australia is gradually experiencing an increased number of snakes and this has happened over the years. In fact, to truly understand how one continent became a hotspot for snakes, one needs to peel back millions of years of evolutionary luck, isolation, and race between predators and their prey. Here’s how it happened… How did this happen?According to wildlife experts, the major secret behind Australia’s deadly reptilian roster comes down to two major factors: ancient hitchhikers and harsh landscapes. About 100 million years ago, Australia split from the southern supercontinent Gondwana, isolating its native wildlife. Roughly 60 million years ago, a massive disaster had wiped out the vast majority of reptiles on the isolated Australian landmass. When the continent eventually drifted north into warmer waters, it was a biological blank slate and became a house to many snakes. It was believed that around 40 million years ago, they repopulated the continent. In fact, the very first snakes successfully colonized Australia by swimming over from Asia. By pure evolutionary chance, these snakes belonged to a single family of Elapidae.What are Elapidae?Elapids are a specific family of venomous, front-fanged snakes that includes cobras, mambas, and coral snakes, to name a few. Because of this, almost all modern land snakes in Australia evolved from this single lineage of venomous ancestors, so much so that at least 65% of Australia's snake species are venomous, which is massive when compared to just 15% worldwide. Other continents also have ample populations of non-venomous snakes such as pythons, boas, and corn snakes that dilute their ‘venomous content’ naturally. Australia simply skipped that diversity because the venomous family got there first. Harsh environmentHow and why did the venom of certain snakes become so highly toxic? Australia is predominantly arid, hot, and dry, meaning food can be incredibly scarce. If a snake living in the harsh outback bites a mouse, and that mouse manages to run 50 yards away before dying, the snake will likely lose its meal to the heat, ants, or another predator. Evolution heavily favored snakes with hyper-potent, fast-acting neurotoxins that drop prey instantly on the spot. Over millions of years, an evolutionary arms race between snakes and their resilient native prey has pushed their venom potencies to extreme levels. Here are the world's 20 most venomous snakes that inhabit the continent of Australia. Read on:Australia's 20 most venomous snakes:Inland Taipan (Oxyuranus microlepidotus)Often known as the "Fierce Snake," the Inland Taipan possesses the most toxic venom of any land snake on Earth. In fact, even a single bite of this snake contains enough neurotoxic and hemotoxic venom to kill an estimated 100 adult men. Despite its terrifying reputation, it is incredibly shy and lives deep within the remote, arid clay cracks of central Australia, meaning human encounters are exceptionally rare.Eastern Brown Snake (Pseudonaja textilis)Biologically known as Pseudonaja textilis, the Eastern Brown snake holds the title for the second-most toxic venom of any land snake. Unlike the reclusive Inland Taipan, this species thrives in agricultural areas and suburban fringes across eastern Australia. They are fast, easily agitated, and responsible for the majority of snakebite fatalities in the country. So, if you plan to travel, be aware of this one! Coastal Taipan (Oxyuranus scutellatus)Naturally equipped with the longest fangs of any Australian snake (up to 13mm), the Coastal Taipan is a massive, highly nervous predator found in northern and eastern coastal regions. Its venom is a lethal cocktail of neurotoxins and coagulants that causes rapid paralysis and prevents blood clotting, with an untreated mortality rate close to 100%.Western Brown Snake / Gwardar (Pseudonaja mengdeni)Widely distributed across the dry, semi-arid regions of Australia, the Gwardar (an Indigenous name meaning "go the long way around") is a highly variable and fast-moving snake. While its venom is slightly less toxic than its eastern cousin, it strikes with extreme speed and injects a large volume of venom that causes severe kidney damage. Mainland Tiger Snake (Notechis scutatus)Thriving in the cooler, wetter regions of southeastern Australia and Tasmania, the Tiger Snake is highly recognizable by its dark and yellow bands. They are often found near swamps and farms hunting for frogs and mice; their powerful myotoxic and neurotoxic venom stops breathing and dissolves muscle tissue. Mulga Snake / King Brown (Pseudechis australis)Though casually called the "King Brown," the Mulga actually belongs to the black snake family and is the heaviest venomous snake in Australia. What it lacks in raw toxicity compared to the Taipan, it makes up for in sheer volume, delivering a massive 150 mg of tissue-destroying venom in a single bite.Common Death Adder (Acanthophis antarcticus)Unlike other elapids that flee when humans approach, the Death Adder relies on camouflage, burying itself under leaf litter. It uses a worm-like lure on its tail to attract lizards and possesses the fastest strike speed of any snake in the world—biting and returning to its defensive position in less than a tenth of a second.Lowland Copperhead (Austrelaps superbus)Found in the colder, alpine regions of southern Australia and Tasmania, where other reptiles freeze, the Lowland Copperhead is uniquely adapted to low temperatures. While its neurotoxic venom is highly lethal, it is a remarkably unaggressive snake that prefers to slither away unless actively stepped on. Dugite (Pseudonaja affinis)Native to the coastal dunes and bushlands of southwestern Australia, the Dugite has adapted well to human habitats, often frequenting golf courses and residential areas in Perth. Its venom contains powerful procoagulants, causing the victim’s blood to clot rapidly within their veins.Eastern Small-Eyed Snake (Cryptophis nigrescens)A small, secretive, jet-black nocturnal snake with a pinkish belly, the Eastern Small-Eyed Snake is often overlooked due to its size. However, it produces a highly unusual, long-acting myotoxin that attacks muscle tissue—including the heart and respiratory muscles—many hours after the initial bite.Red-Bellied Black Snake (Pseudechis porphyriacus)One of eastern Australia's most commonly encountered snakes, this beautiful glossy-black reptile features vibrant red flanks. While venomous, it is generally docile; its bites cause painful local swelling and bleeding issues but are very rarely fatal to humans.Rough-Scaled Snake (Tropidechis carinatus)Often confused with the Tiger snake, this highly nervous species is found in isolated pockets of rainforest and wet coastal forests in Queensland and New South Wales. It possesses highly toxic neurotoxins and hemotoxins and will defend itself fiercely if cornered.Collett’s Snake (Pseudechis colletti)A stunningly beautiful snake featuring dark bands over a rich pink or salmon-colored belly, Collett’s Snake is found exclusively in the black soil plains of central Queensland. It possesses highly toxic venom that attacks muscles and kidneys but is known to have a relatively placid demeanor. Blue-Bellied Black Snake (Pseudechis guttatus)Also known as the Spotted Black Snake, this species occupies the forests and woodlands of inland Queensland and New South Wales. It is highly venomous, causing severe local pain and systemic clotting disorders, though it is generally shy and avoids human conflict.Stephen's Banded Snake (Hoplocephalus stephensii)An agile, tree-dwelling elapid found in the forests of eastern Australia, this snake is perfectly adapted for climbing. It carries a potent procoagulant venom that can cause severe internal bleeding, and it will readily strike if its tree-hollow hiding spots are disturbed.Pale-Headed Snake (Hoplocephalus bitorquatus)A close relative of Stephen’s Banded Snake, this nocturnal, tree-dwelling species is easily identified by its light gray head against a darker body. It is an aggressive striker when threatened, delivering a potent neurotoxic bite that requires immediate medical attention. Broad-Headed Snake (Hoplocephalus bungaroides)This endangered species is restricted to the sandstone rock formations around the Sydney basin. Due to its specific habitat and nocturnal nature, human interactions are rare, but its venom is highly toxic and shares the dangerous nerve-paralyzing traits of its genus.Curl Snake (Suta suta)Named for its distinct defensive posture where it coils tightly and hides its head, the Curl snake is a small but highly venomous elapid found throughout Australia's arid interior. It hunts lizards at night and inflicts a painful bite that causes severe localized symptoms.Bardick (Echiopsis curta)A stocky, heavily built snake found in the semi-arid shrublands of southern Australia, the Bardick is often mistaken for a Death Adder due to its shape. It relies on camouflage and can deliver a highly toxic bite containing strong neurotoxins if stepped on.Yellow-Faced Whipsnake (Demansia psammophis)This one is a very slender, lightning-fast snake found across almost the entire Australian mainland. While its venom is technically highly toxic by weight, it produces a very small quantity of it and has tiny fangs, making its bite excruciatingly painful but rarely life-threatening to adults.