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Australia has a fearsome reputation for its dangerous and venomous wildlife. The country is home to 20 of the world's 25 most venomous snakes, including the inland taipan, which is native to Australia and is the most venomous snake in the world. Australia also has the world's deadliest jellyfish, spiders, octopuses, ants, and bees. The continent's only native mammal, the platypus, also has a venomous sting. Australia's dangerous wildlife is due to an evolutionary process that began when the continent split from the supercontinent Gondwana around 100 million years ago.
| Characteristics | Values |
|---|---|
| Number of venomous species in Australia | 66 |
| Number of venomous snake species in Australia | 145 |
| Number of snake species in Australia | 220 |
| Most venomous snake in the world | Inland Taipan |
| World's most venomous insect | Trap-jaw ants |
| World's most venomous marine creature | Box jellyfish |
| World's most venomous snail | Marbled cone snail |
| World's most venomous octopus | Blue-ringed octopus |
| World's most venomous fish | Stonefish |
| Most dangerous spider in Australia | Sydney funnel-web spider |
| Most dangerous bird in Australia | Southern cassowary |
| Most dangerous species of snake in Australia | Eastern brown snake |
| Most dangerous crocodile in Australia | Saltwater crocodile |
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What You'll Learn
Saltwater crocodiles
The saltwater crocodile is an opportunistic hypercarnivorous apex predator. They ambush their prey by grabbing them with their powerful jaws and dragging them back into the water. They have around 40-60 large teeth designed to rip flesh off their prey, as the food is swallowed whole. They can move incredibly fast over short distances, reaching speeds of around 18 kilometres per hour in the water. On land, however, they are slow and cumbersome and would struggle to keep up with even a jogging human.
These crocodiles have an incredible ability to hold their breath underwater for up to eight hours, making them perfect stealth predators. Their eyes and nostrils are positioned on top of their heads, allowing them to remain hidden beneath the water's surface while still being able to see, hear, smell, and breathe. They are capable of living in the open ocean for extended periods and can cross large expanses of water to reach new areas. This adaptability has made them widespread in Southeast Asia, New Guinea, and some Pacific Islands.
The saltwater crocodile has faced threats from illegal hunting and habitat loss. They were hunted extensively for their skin until the 1970s. Today, they are recognised for their important ecological role and are protected. They are a direct link to our prehistoric past, having remained unchanged for over 65 million years.
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Snakes, including the oriental brown snake and inland taipan
Australia is known for its dangerous and venomous wildlife, including snakes such as the oriental brown snake and the inland taipan.
Oriental Brown Snake
The oriental brown snake, also known as the eastern brown snake, is a highly venomous species native to eastern and central Australia and southern New Guinea. It was first described by French zoologists in 1854 and has since been classified under the genus Pseudonaja. This snake can grow up to 2 meters in length and is variable in colour, ranging from pale brown to black with a pale cream-yellow underside. It is commonly found in rural and suburban areas, particularly in habitats disturbed by human activity, and preys on small vertebrates such as frogs, reptiles, birds, and mammals.
Inland Taipan
The inland taipan (Oxyuranus microlepidotus) is often referred to as the world's most venomous snake. It is a specialist hunter of mammals and its venom is highly lethal to humans, with enough potency to kill over 100 fully grown adults in a single bite. Fortunately, due to its remote and semi-arid habitat in the border regions of Queensland and South Australia, human encounters with this snake are rare. The inland taipan is a shy and reclusive species, preferring to escape from potential threats rather than confront them. It feeds primarily on small to medium-sized mammals, especially long-haired rats, and is most active during the early morning hours.
Both the oriental brown snake and the inland taipan pose significant threats to humans due to their venomous bites. However, it is important to note that their behaviour and habitat also play a role in their dangerous reputation. The oriental brown snake's adaptability to human-disturbed environments and its defensive nature when surprised or cornered increase the likelihood of human encounters and potential strikes. On the other hand, the inland taipan's shyness and preference for remote locations make it less likely to come into contact with humans, despite its highly venomous bite.
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Spiders, including the funnel-web and redback spider
The funnel-web spider, a member of the Atracidae family, is native to Australia and consists of three genera: Atrax, Hadronyche, and Illawarra, comprising 35 species. Some funnel-web spiders produce venom that is dangerous to humans, with bites from six species causing severe injuries or even death. The Sydney funnel-web spider (Atrax robustus) and the northern tree-dwelling funnel-web spider (Hadronyche formidabilis) are potentially deadly. Funnel-web spiders are medium to large in size, with body lengths ranging from 1 to 5 cm, and some even reaching 8 cm. They have a hairless carapace covering the front part of their bodies and ample venom glands that lie within their chelicerae. Their fangs are large and powerful, capable of penetrating fingernails and soft shoes. These spiders are commonly found in suburban rockeries and shrubberies, rarely venturing into open terrain.
The redback spider exhibits unique behaviour when hunting. It first immobilises its prey by squirting a substance resembling 'superglue' from its spinnerets, sticking the victim's limbs to its own body. It then wraps its prey in silk and repeatedly bites it on the head, body, and legs before sucking out the liquefied insides. The female redback spider is the only one with a dangerous bite, and it is rarely life-threatening unless a body part is directly placed into the web. Similarly, male funnel-web spiders are responsible for most recorded deaths and medically serious bites, with no fatalities recorded in females.
Both the redback and funnel-web spiders have a significant impact on humans due to their venomous bites. The redback spider's bite causes severe pain, sweating, muscular weakness, nausea, and vomiting. Meanwhile, the funnel-web spider's venom is highly toxic and fast-acting, affecting the nerves and resulting in the release and depletion of neurotransmitters. Despite their deadliness, effective antivenoms are available for both spider species, reducing the risk of fatalities.
In conclusion, spiders such as the redback and funnel-web are notorious members of Australia's venomous wildlife. Their bites can be dangerous, and in some cases, deadly, to humans. However, with the development of antivenoms and a better understanding of these spiders, the risk of fatalities has decreased significantly.
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Blue-ringed octopus
The blue-ringed octopus is a highly venomous marine animal found in the Pacific and Indian Oceans, from Japan to Australia. They are extremely dangerous if provoked, as their bites contain enough neurotoxins to paralyse and kill humans within minutes. The blue rings on their arms, which give them their name, are only visible when the octopus feels threatened and is about to attack. They are well-camouflaged, with a base colour ranging from grey-green to cream or yellow, and their small size—reaching up to 22 centimetres long—makes them difficult to spot.
These octopuses are known for their distinctive iridescent blue rings, which are created by specialised light-reflecting cells called chromatophores. When alarmed or attacked, they can quickly change colour, flashing their bright blue rings on a yellow or cream base as a warning. This colour change is achieved through neural control, with muscles contracting and relaxing to expose or hide the iridescence.
The venom of the blue-ringed octopus is called tetrodotoxin, which is said to be around 1,000 times more toxic than cyanide. It contains neurotoxins that affect vision and speech, leading to muscle weakness, breathing difficulties, and paralysis. While there have been very few recorded deaths from their bites, those bitten require swift CPR to survive. There is currently no antidote.
To avoid an encounter with a blue-ringed octopus, it is recommended to wear thick-soled shoes when wading in shallow rock pools or tide pools, as they are often found hiding in crevices or under rocks during the day, emerging at night. It is also advised to keep a respectful distance and remember that their blue rings may not always be visible, so it is best to assume that any small octopus encountered is potentially dangerous.
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Box jellyfish
The box jellyfish, named for its box or bell shape, is considered the most venomous marine animal in the world. It is found in the tropical and subtropical oceans between 42° N and 42° S, including the Atlantic and East Pacific Oceans, as well as the waters of California, the Mediterranean Sea, Japan, South Africa, New Zealand, and Australia.
In Australia, the box jellyfish species Chironex fleckeri is the largest and most venomous. It has caused at least 79 deaths since the first report in 1883, with severe stings causing cardiac arrest within two minutes. The thumbnail-sized Irukandji box jellyfish has also been responsible for at least two deaths in Australia. Its sting causes severe physical and psychological symptoms known as Irukandji syndrome, which can lead to cardiovascular collapse and death within 2 to 5 minutes.
The box jellyfish's tentacles are equipped with millions of nematocysts or stinging cells, delivering venom that affects vision and speech and can cause paralysis, cardiac arrest, and death within minutes. The sting is extremely painful, leaving whip-like marks that swell up and turn red.
To prevent and treat box jellyfish stings, preventative measures in Australia include nets deployed on beaches and jugs of vinegar placed along swimming beaches for rapid first aid.
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Frequently asked questions
Australia is known for its dangerous wildlife, including:
- Snakes — Australia has about 220 species of snakes, 145 of which are venomous. The eastern brown snake is the most dangerous species of snake in Australia, causing about 60% of snakebite fatalities. The inland taipan is the world's most venomous snake and is also found in Australia.
- Spiders — Redback spiders are found all over Australia and are venomous. Funnel-web spiders are also venomous and have killed people.
- Crocodiles — Saltwater crocodiles are found in coastal waters, reefs, and brackish inland waterways across Australia. They are the largest living reptiles in the world, growing up to 23 feet in length and weighing over 2,000 pounds.
Some of the most venomous animals in Australia include:
- Box jellyfish — found in northern Australian waters, they have caused more than 70 deaths since 1883.
- Blue-ringed octopus — found in tide pools and coral reefs in Indo-Pacific waters, their bite can induce muscle weakness, breathing difficulties, and paralysis within 10 minutes.
- Stonefish — found on Australia's reefs, their sting can be lethal and produce extreme pain.
Here are some general safety tips when visiting Australia:
- Wear appropriate footwear when walking in the bush or wading in shallow rock pools to protect against snake bites and blue-ringed octopus bites.
- Keep yards clear of debris and long grass to avoid attracting snakes.
- Do not pick up shells on the beach as blue-ringed octopuses like to hide inside them and may fall out and bite if startled.
- Do not enter the water when a beach is closed to avoid box jellyfish, which are often transparent and difficult to spot.
- Be cautious of saltwater crocodiles, which are found in coastal waters and can be aggressive.
