Wow!
Tough question.....no idea why we have all those "horrors".
They do exist, of course, but the incidence of death caused by by the mentioned animals is pretty rare.
And it is a big country (about the size of the contiguous US states combined) so the hazards are spread out a bit. For instance, the maneating crocs are all in tropical areas and, mainly in and around estuaries. The inland (freshwater) specie is almost harmless...nasty bite if you annoy them enough.
Killer kangaroos ? I suppose, If you tried hard enough, you could get one to kill you when he was cornered. Attacks are extremely rare. I once saw footage of a rabbit attacking and killing a snake....same sort of odds, I imagine.
Emus are a large, powerfull bird with strong legs and big claws.....see the comments on kangaroos. Same odds.
Snakes ? We have, I am lead to believe, the 10 most deadly in the world. But they are, generally timid and will avoid humans wherever possible. I don't have stats but I would be surprised if there would be 30 bites per year and a couple of deaths...India has thousands.
I have never met any one who has died from the bite of a spider, tick or any of the other nasty crawlies. It happens, occasionally.
Box jellyfish are another tropical inhabitant and avoiding saltwater during the season avoids the risk. A fit adult usually survives but, I am sure, the incident is never forgotten.
On the other hand, we don't have any large carnivores like the big cats. Well, there is the feral pig...I have heard stories of campers being rolled over while sleeping on the ground. But you would have to stay awefully still for a long while to be in danger of being consumed
They have been known to attack humans when they are protecting young but I have not heard of fatalities.
Couple of shark attacks per year....but, if you consider the number of Australians who participate in sea sports, the numbers are insignificant. Unless one of them is you
No Brown bears or grizzlies, either.
Oh, yeah....the dingo. The dingo has a healthy fear of humans and is not a problem.
Except in areas where dumb humans make efforts to "befriend" them by feeding. They don't become tame but lose their fear of people. Most tourist areas have reviewed their tourist education policies since the famous "dingo and the baby" case and forbid feeding.
Frankly, the real danger in the Outback is the environment. Careless tourists go missing in arid country more often than should be necessary. If they are not found quickly, heatstroke and lack of water are killers.
And as for carrying a firearm for protection: not necessary, And illegal except on private property where you have permission to shoot. And you better have a valid firearms licence.
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BrianWE
ICQ #21525343