Can't forget the dingos. Look like normal dogs, but without the domestication - they'll happily take you down for their dinner seconds after accepting a pat from you.
Introduced species can be nasty too, such as the wild pig. Fun to hunt, but you better make DAMN sure you hit it with something big and powerful - forget about .223, you need at least a 7.62 although the round of choice is the 12 gauge slug.
So the land is dangerous? Thinking of taking to the sea for some safety?
HA! we've got sharks of many varieties, blue bottle jelllyfish, blue ringed octopus, stingrays (just ask Mr Irwin about them - oh, wait, you can't, he got stabbed in the heart by one) and of course the salt water crocodiles which don't just live inland.
All in all it's a great place to raise a family.
