As an Aussie, I'm also quite surprised how many people think it is legitimately dangerous here. There are dangerous animals here just like everywhere else in the world. And just like the rest of the world, most animals prefer living as far away from human populations as possible, they won't do anything unless a stupid tourist provokes them.
So while our wildlife is potentially deadly, very few people die at the hand of our animals.
Asita said:
Sea Wasp Box Jellyfish: hard to see, hard to notice its sting, one of the most venomous organisms on the planet. Without treatment death can occur in less than 3 minutes.
There have been no deaths from jellyfish since 2007. Jellyfish account for 66 deaths since records began in 1883. The box jellyfish was responsible for 64 deaths, and the Irukandji the other two. That's less than one death per year. There is generally not enough poison to produce anything more than a very itchy rash on adults, even from Box Jellyfish. Most deaths are children.
Blue Ringed Octopus: One of the world's most venomous marine animals. No antivenom exists. Unless you get continous artificial respiration for more than a day after being bitten, you're pretty muh dead.
Only two people have ever died from Blue Ringed Octopus poisoning.
Cone Snail: Highly venomous organism, no antivenom exists. Only treatment is to provide life support until the victim works the venom out of his/her system.
There has never been a recorded death from cone snails in Australia that I can find. There's only been about 30 deaths attributed to it in the world.
Stonefish: one of the most venomous fish in the world (anyone else noticing a trend here?) Thankfully antivenom does exist for this.
Only one death has ever been confirmed.
Snakes: The 10 most venomous snakes in the world all live in Australia
Less than 2 people a year die from a snakebite.
Sydney Funnelweb Spider: Deadliest spider in the world and highly aggressive to boot. Antivenom exists and is very effective in treatment, but stocks of antivenom are supposedly running low.
There have been no reported deaths from spiders since 1979.
The deadliest of all Australian creatures, responsible for an average of 10 deaths per year, is the European Honey Bee, which can induce anaphylactic shock in some people. A bee that can also be found in the UK.