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The Top Deadliest Animals In Australia
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Lionfish

  • Danger Level: 7/10

While Lionfish are slowly becoming an invasive species in the Americas, they are traditionally from the Australian region. In fact, they had been native to the coral reef there. Currently, NOAA and its partners are trying to fix the issue and move more lionfish back to the reefs. Lionfish serve a great purpose to reefs due to removing pests that cause the reefs harm. They are feared fish in the ocean for an understandable reason. They possess venomous spikey fin rays.

The Top Deadliest Animals In Australia
[Image via Coldmoon Photoproject/Shutterstock.com]
These rays are filled with venom that has negative inotropic and chronotropic effects, as well as the ability to drop blood pressure. The latter is potentially happening to animals and humans due to nitric oxide being released. People often have neurotoxic effects such as convulsions, confusion, dizziness, headaches, numbness, paresthesia, etc. Severe effects might be paralysis of the limbs and heart failure. Adults might have severe issues but rarely die, it is often children most at risk of death.

The Top Deadliest Animals In Australia
[Image via Juerginho/Shutterstock.com]

Common Death Adders

  • Danger Level: 7/10

Unlike some animals on this list, the Death Adder snake is only native to Australia and New Guinea. One might assume with a name like “death” adder, they might kill many humans or even attack a lot. This is ultimately not true, but they are relatively aggressive if you enter their environment. Their lightning-fast strike is notable, but you’re only going to see this if the snake feels threatened. Unlike some snakes, death adders lack hardly any fat and operate on mostly muscle.

The Top Deadliest Animals In Australia
[Image via School of Biomedical Sciences – University of Melbourne]
This aids their strike speed, but also the power and pain of their bite. Naturally, they are one of the deadliest animals in Australia for reasons beyond this. Specifically, the venom they possess can kill people. When the snake bites, it averages 100mg of its neurotoxin in each bite. That can cause a healthy adult to die in just 6 hours. Thankfully, there is an antivenom on standby at Australian medical facilities. This is one major reason their death total is so low. Getting medical treatment immediately is recommended by experts.

The Top Deadliest Animals In Australia
[Image via Vladimir Wrangel/Shutterstock.com]

Reef Stonefish

  • Danger Level: 7/10

While we might be discussing the Reef Stonefish in particular, all stonefish should be avoided if possible. The “reef” version is simply the most notable due to it being so widespread. This version of the species is also the most populous, so you’re more than likely going to run into it more than another. That said, stonefish are all over the world but this version of the species, in particular, loves the Australian region. Stonefish are the single most venomous fish species on the planet today.

The Top Deadliest Animals In Australia
[Image via Thailand Liveaboards]
They possess needle-like dorsal fins packed with venom. To hurt their prey, they essentially just ram into them to stick their spikes in. Different but effective neurotoxins are within their venom, which can be pretty painful. Pain lasts at least 24 hours but for many, it can take several days to fully stop as the venom works its way out of your system. Some people can die from their sting, specifically due to allergic reactions. While very few deaths occur, they can happen as soon as an hour after being stung. Therefore, it is recommended that you seek medical attention immediately.

The Top Deadliest Animals In Australia
[Image via Elena_Photo_Soul/Shutterstock.com]

Blue-Ringed Octopus

  • Danger Level: 7/10

The Blue-Ringed Octopus is absolutely beautiful. However, it has long been said that the more beautiful an animal is, the more likely it is to kill you. Almost like humans in a horror movie. Sorry, we saw the movie “Species” the other day and still have nightmares from it. That said, while this octopus is not exclusively in Australian waters, they are often found in the Pacific and Indian Oceans between Japan and Australia. Making them an Australian species worthy of note.

The Top Deadliest Animals In Australia
[Image via PBS]
What makes the blue-ringed octopus one of the deadliest animals in Australia today? The potent venom it possesses. They have something known as “tetrodotoxin,” which they tend to use rarely. When they do, it’s enough to kill pretty much any species. Of course, human deaths are rare mostly due to the octopus being in the deep ocean. Humans do not tend to venture down that far very often. If the octopus did sting a person, it can kill them between 1 to 10 hours. There is no known antivenom for their version of tetrodotoxin either!

The Top Deadliest Animals In Australia
[Image via Chatchai Somwat/Shutterstock.com]

Funnel-Web Spiders

  • Danger Level: 8/10

While Australia is known for its wide variety of spiders, very few are actually a major problem for people to worry about. Yet some, such as the Funnel-Web Spider, are among the deadliest animals in Australia today. They possess a Delta-Atracotoxin venom that is often referred to as δ-atracotoxin, which is an ion-channel inhibitor. It is a version of neurotoxin that is quite powerful and acts super quickly. For animals, it can cause a reaction within minutes and kill in less than 20.

The Top Deadliest Animals In Australia
[Image via Amith Nag/Shutterstock.com]
For humans, things are a bit different. It targets our sodium ion channels and motor neurons, making them no longer function properly. This will then affect our motor function, but also our breathing. Interestingly, the venom will kill humans and other primates but it cannot kill any other mammal species. They bite roughly 30 to 40 people every year but only an estimated 14 have died from it. Humans can die within 15 minutes to an hour, which is why you need medical attention quickly if bitten.

The Top Deadliest Animals In Australia
[Image via Sergey Uryadnikov/Shutterstock.com]

Great White Sharks

  • Danger Level: 8/10

The Great White Shark is the most feared shark species in the ocean. Yes, they too are not just found in Australia but can also be found all over the globe. Why do they rank high among the deadliest animals in Australia? This is mostly due to the numerous attacks on humans within this region. They might attack surfers, water skiers, scuba divers, etc. They are the shark species with the most unprovoked bites on humans. However, these are global statistics. With a large population worldwide compared to other sharks, they are bound to have higher numbers.

The Top Deadliest Animals In Australia
[Image via New York Post]
They do not tend to like eating us, funny enough. The human muscle and bone ratio is hard to digest for the great white shark, so they more often attack but do not kill and eat us. We’re ultimately too boney for them compared to fatty seals (which they love). Humans often seem to escape after their initial bite too. Yet they attack several people annually. Great Whites have been a vulnerable species, according to the Australian Government, since 1999. This is why the nation does not allow the random killing or “shark culling” of the great white shark. New Zealand and other nations also have conservation plans for them too.

The Top Deadliest Animals In Australia
[Image via Julian Popov/Shutterstock.com]

Coastal Taipan Snakes

  • Danger Level: 9/10

Coastal Taipan Snakes are given their name mostly for sticking close to coastlines and being part of the taipan family of snakes, which isn’t really difficult. They do not truly kill many people per year because most know to steer clear of them if one just so happens to be nearby. All in all, they are the third most venomous snake on the planet today. Most of the time, they bite humans specifically out of defense rather than seek them out.

The Top Deadliest Animals In Australia
[Image via Ken Griffiths/Shutterstock.com]
They are not highly aggressive but can be territorial. But if you steer clear of them. they’ll leave you alone too. The species know how powerful its venom is because they tend to warn us before striking. Usually, they freeze up after curling together, then lunge forward if they still feel threatened. The result is a deadly dose of venom every single bite. Their venom contains taicatoxin and neurotoxin at a 0.106mh potency that contains a 100% mortality rate for untreated bites. If medical treatment is sought out immediately, most humans survive their bite.

The Top Deadliest Animals In Australia
[Image via Ondrej Prosicky/Shutterstock.com]

Crocodiles

  • Danger Level: 9/10

Australia is heavily known for its crocodiles. While saltwater crocs can be found in other places, freshwater versions can too. It is only in Australia, however, where you’ll see both. Australia’s freshwater version is not known as a man-eater, mostly due to the size of freshwater crocs. They will bite out of self-defense, however. Australia’s saltwater crocodile is the real killer to look out for. They do not mind attacking any species near them. Crocs have attacked lions, cheetahs, hippos, deer, and more.

The Top Deadliest Animals In Australia
[Image via Smithsonian Magazine]
While the crocs of Africa are bad, Australia’s crocodiles are heavily notable. This is mostly due to Australian conservationist and television host, Steve Irwin. Nicknamed the “Crocodile Hunter,” he helped us learn more about them and was very effective in several studies on the species. In total, roughly 1,000 people are killed by crocs annually. Many of these happen here, making them one of the deadliest animals in Australia today. However, the best thing to do if you see a croc is to simply run in the opposite direction. Try to not randomly go into marshes or places they are common, to begin with, too.

The Top Deadliest Animals In Australia
[Image via Kristian Bell/Shutterstock.com]

Eastern Brown Snakes

  • Danger Level: 10/10

Australia certainly has a lot of snakes, and the Eastern Brown Snake is one of the most feared. This is ultimately due to their venom level, which ranks as the second-most of any snake on the planet. Australians see them quite a lot, which is why they are responsible for up to 60% of all snakebites in the nation every year. They tend to be pretty solitary, however. That’s probably why their yearly human bite count is not exactly massive.

The Top Deadliest Animals In Australia
[Image via Ken Griffiths/Shutterstock.com]
People in the bush tend to be the most common to be bitten, as the eastern brown snake usually does not live around human beings. Yet encroachment on environments that these snakes hold has led to more interactions with them. The species is certainly deadly, and that’s due to what their venom is packed with. It has a potency of 5.0mg and filled with neurotoxin, hemotoxin, and mycotoxin. This is why it is capable of killing within 15 to 30 minutes, with a maximum of just 1 hour!

The Top Deadliest Animals In Australia
[Image via Dewald Kirsten/Shutterstock.com]

Box Jellyfish

  • Danger Level: 10/10

While Box Jellyfish can be seen in various places, they have been known for their heavy connection to the Australian region for many years. The species is responsible for more serious injuries to humans than sharks, sea snakes, and stingrays combined annually. Plus, they are known for killing up to 50 people per year. How do they accomplish so many injuries and even deaths each year? First, it’s due to traveling in packs where you won’t just see one jellyfish but often several.

The Top Deadliest Animals In Australia
[Image via National Geographic]
Second, they rarely sting just once. When you are attacked with just one swipe of their venomous tentacles, they will send more in rapid succession. They contain what is known as “jellyfish venom,” which is mostly a combination of powerful neurotoxins. It can paralyze people, make it hard to breathe, cause heart problems, cause necrosis, shock, etc. That can make getting to safety after an attack quite hard. Depending on the severity, people can die from a sting or series of them anywhere from a few minutes to a few hours. It’s all dependent on the person ultimately.

The Top Deadliest Animals In Australia
[Image via Ken Griffiths/Shutterstock.com]

Inland Taipan Snakes

  • Danger Level: 10/10

The Inland Taipan Snake is the single most venomous snake on the planet today. Just one bite from this snake is enough to kill 100 full-grown men. The crazy part is that you’d think with so much packed in one bite, they’d be unable to offer lethal doses in other bites. However, the snake has an excellent recovery rate and can offer a severe strike several more times in a row without falling off of lethality.

The Top Deadliest Animals In Australia
[Image via hiveminer.com]
The venom that the inland taipan possess is filled with neurotoxin, paradoxin, hemotoxin, oxytoxin, myotoxin, and som hyaluronidase enzymes. These add up to make the venom very deadly. Certainly enough to make this snake one of the deadliest animals in Australia. The venom is absorbed by the body quickly and results in human death anywhere between 5 minutes and just under 1 hour. There is an antivenom for it, but that’s if you’re lucky enough to get it in time.

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