I'm surely ignorant of Australian wildlife life, as you are of North American (specifically the US, there is a difference) wildlife.
Please correct me where I'm wrong as I correct you. This isn't a pissing contest, I'm genuinely curious about the Australia's back country.
As of snakes;
9 deadliest snakes from Britannica.com lists 4 snakes from Australia (I'm counting the sea krait). There are zero from North America but I'll give you a bone, the Coral Snake is our most venomous, but it's so docile as to not be a worry.
As for bears? In the lower 48 (that means not Alaska or Hawaii) we don't have a brown bear problem. They're functioningly extinct as are wolves. Black bears are still around but not dangerous because every American in the back country carries guns.
Moose? Truly terrifying. It's more of a Canadian problem though. Any American treaking during rut (mating season) will have a large caliber rifle.
Jaguars? You probably didn't know this but 100 years ago Jaguars were native to North America. Why not now? Guns.
I spend a lot of time in the mountains and there is one animal that scares me. It doesn't matter that I'm armed, it would get the jump on me.
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These things terrify me...