🤣 it is true there are lots of animals that could kill/injure you ,
giant spiders eating cows - not so much
redback spiders - quite common, but once you know about them not much of an issue - just don't put your hands in places where you can't see without gloves on.
kangaroos - very common, see them all the time while out walking - just give them a wide berth and they will just stare at you or hop away - the most common dangerous encounters are when they jump out in front of your car at the last second.. had several of those, as has my wife, daughter, son and brother (in my car!). Insurance is expensive here.
Snakes (a few of the most venomous in the world) - common in the bush and in some parts of the country they are everywhere - I've not had any close encounters, but I'm always wary when bush walking.
Salt water crocidiles - they live up north - avoid rivers and the sea past certain lattitudes (I live down south so not an issue).
Fresh water crocidiles - mostly in the north/north west - they rarely attack people but can do some serious damage, so best avoided.
Irukandji jellyfish - mostly in the tropics - don't swim in the sea
There are others but in all of the above fatal encountes with them are easily surpassed by vehicle accidents, heart disease, diabetes etc.