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Australia has a reputation for being home to some of the world's deadliest animals, from venomous snakes and spiders to scary sea creatures like the great white shark and saltwater crocodile. While the continent has a diverse range of dangerous species, the likelihood of encountering and being killed by them is relatively low. The development of antivenoms and Australia's effective education program on poisonous bites have significantly reduced morbidity rates. So, while Australia may have numerous venomous creatures, it is not necessarily the most poisonous country in the world.
| Characteristics | Values |
|---|---|
| Deadliest animals | Snakes, spiders, sharks, saltwater crocodiles, blue-ringed octopus, stonefish, box jellyfish, bees |
| Most venomous snakes | The inland taipan (Oxyuranus microlepidotus) |
| Most venomous spiders | Sydney funnel-web (Atrax robustus) |
| Most venomous creature | Box jellyfish |
| Most venomous mollusc | Southern blue-lined octopus (Hapalochlaena fasciata) |
| Most venomous mammal | Male platypus |
| Most venomous bird | Cassowaries |
| Number of people hospitalised due to venomous bites or stings (2000-2013) | 41,000 |
| Number of deaths due to venomous bites or stings (2000-2013) | 64 |
| Number of deaths due to snake bites per year in Australia | 1-2 |
| Number of deaths due to snake bites per year in India | 50,000 |
| Number of deaths due to Africa's black mamba per year | 20,000 |
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What You'll Learn
Australia's venomous snakes
Australia has more venomous snakes than anywhere else in the world. Out of the over 205 known snake species in the country, 25 are considered deadly, and 66 are recognised as venomous. Some sources state that there are 151 species of elapid snake in Australia, all of which are venomous to varying degrees, while others claim there are 147 venomous snake species.
Australia's snakes are widely viewed as the world's most deadly. The toxicity of a snake's venom is usually measured by LD50—the amount of the toxin required to kill 50% of test animals within a given time, usually mice. The smaller the LD50 value, the more potent the venom. Using this method, Eastern Brown Snakes have a relative toxicity of 12.5, making them twelve and a half times more toxic than the Indian Cobra. Another measure is the Cobra Scale, which assigns a value of one to the Indian Cobra, and compares the venoms of other species to it.
The likelihood of humans encountering a snake is another factor that determines its danger. Many snakes are secretive, cryptic, or nervous, and most residents rarely see them. The potential danger of venomous snakes also includes the health, age, size, or body bulk of the victim, as well as their sensitivity to natural toxins.
Despite Australia's fearsome reputation, deaths from venomous bites or stings are rare. From 2000 to 2013, 41,000 people were hospitalised due to venomous bites or stings, but only 64 victims lost their lives. The inland taipan, often cited as the world's most venomous snake, is more docile than many other species. Australia also has ample anti-venom treatments for nearly all venomous species.
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Spiders and antivenoms
Spiders are a major cause of concern in Australia. The Sydney funnel-web spider, found mostly in the Sydney region, is the only known killer spider in the country. Its bite releases a neurotoxin that can kill a child in 15 minutes. The Australian Reptile Park's funnel-web spider antivenom program has played a crucial role in addressing this threat. Since its inception in 1981, there have been zero deaths recorded due to funnel-web spiders. The program involves 'milking' the spiders to collect their venom, which is then used to create antivenom. This antivenom has also proven effective against other funnel-web spider species.
Redback spiders are another venomous species in Australia. Their bites can be fatal, and antivenom therapy is often required. The redback spider antivenom is the most commonly used in Australia, and it can also treat bites from black widow spiders.
While Australia is known for its venomous spiders, deaths from spider bites are very rare due to the availability of antivenoms. Between 5,000 and 10,000 spider bites occur annually, but only a small percentage require antivenom treatment. From 2000 to 2013, only 64 people died from venomous bites or stings, with most hospitalized cases not resulting in fatalities.
The process of creating antivenom is challenging but not impossible. Antivenom is made by injecting small amounts of venom into rabbits, gradually increasing the dosage over time until the rabbit can withstand a lethal dose. This process generates antibodies in the rabbit's blood, which are then separated through spinning to create antivenom.
Australia's venomous fauna includes some of the world's most dangerous species, and antivenoms play a crucial role in protecting people from their potentially deadly effects. While spiders like the Sydney funnel-web and redback can inflict harmful bites, the development of effective antivenoms has significantly reduced the risk of fatalities.
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Saltwater crocodiles
In Australia, saltwater crocodiles are found in northern coastal areas in a wide range of habitats, including drainages, rivers, estuaries, creeks, swamps, lagoons and billabongs. They have even been spotted in water twice as salty as the sea and hundreds of kilometres inland. Northern Australia is particularly known for its saltwater crocodiles, with most rivers in the region having about 5 crocodiles per kilometre. The Mary River in the Northern Territory, however, holds the record with 15 crocodiles per kilometre, the highest density in the country. The Northern Territory is estimated to be home to about 100,000 wild saltwater crocodiles, more than anywhere else in the world. Other regions with significant saltwater crocodile populations include Northern Queensland and Western Australia.
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Sharks and stingrays
Australia is known for its venomous creatures, but it is not the deadliest continent. While the chances of being harmed by a venomous animal in Australia are low, the country is home to some of the world's most dangerous animals.
Australia has around 180 species of sharks in its waters, with about 70 thought to be endemic. They are found in all habitats around the coastline, but most are found on the continental slope or shelf, primarily on the bottom. Some are also found in coastal waters, and a few are found in freshwater systems such as rivers and estuaries.
Six out of the seven shark species covered by the Sharks MoU (Memorandum of Understanding on the Conservation of Migratory Sharks) occur in Australian waters: the white shark, whale shark, basking shark, porbeagle, shortfin mako, and longfin mako.
The great white shark is one of the animals people fear the most in Australia, but it is not unique to the country and can be found in other parts of the world.
Hammerhead sharks are also found in Australian waters, and their movements have been tracked by James Cook University researchers. They found that hammerheads spend much of their time in the shallows of the Great Barrier Reef, feeding on a plentiful supply of stingrays. The tissue samples from both species showed similar chemical signatures, indicating their position in the same food web.
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Stonefish and octopuses
Australia has a reputation for being home to some of the world's deadliest animals, including venomous snakes, spiders, and sea creatures. While the likelihood of encountering these dangerous creatures is rare, and deaths even rarer, it is still important to be aware of potential hazards when visiting the country.
The blue-ringed octopus is another highly venomous creature found in Australian waters, particularly in beach rock pools. Its bite may be painless, but it can cause paralysis within minutes, leading to respiratory issues and heart failure. Only two deaths have been recorded in Australia from blue-ringed octopus bites, but many people have come close to death. It is important to avoid touching or standing on these octopuses, as that is when they are most likely to bite.
In summary, stonefish and blue-ringed octopuses pose significant risks to humans in Australian waters. Their venomous stings and bites can lead to serious health issues and, in rare cases, death. Taking precautions, such as wearing protective footwear and avoiding contact with the creatures, can help reduce the risk of encountering their venomous defences.
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Frequently asked questions
Australia is home to some of the world's deadliest animals, but it is not the deadliest country. While it has more deadly snakes than any other country, the chances of being killed by one are minuscule due to the availability of antivenom and low population density.
Some of Australia's deadliest animals include the Sydney funnel-web spider, the stonefish, the southern blue-lined octopus, the box jellyfish, and the saltwater crocodile.
The Sydney funnel-web spider's bite releases a neurotoxin that can kill a child in just 15 minutes. However, there have been no deaths since the development of an anti-venom in 1981.
From 2000 to 2013, 41,000 people were hospitalized due to venomous bites or stings, with only 64 fatalities. The likelihood of being killed by a venomous animal in Australia is very low, especially with the development of antivenins and Australia's robust healthcare system.
Yes, some non-venomous animals that are considered dangerous in Australia include the great white shark, the cassowary, and the crocodile.
