Pretty much like every other aussie here stated, Australia is very stereotyped, sure it has the most dangerous snakes, spiders and lizards in the world not to mention other things but the chances of you coming across one in the city is next to none.
unless you are going out in the middle of Australia to the bush somewhere you aren't going to come across any besides in the zoos, or at least very very rarely. It's not like people think it is, it's not like there are Kangaroos hopping around in the middle of the road and such. However it is a great place to visit, lots of things to see and sights to enjoy.
The house spiders are in Queensland. They can eat birds.
I've come across a few in Sydney, there was one near the soccer field in my school once.
40C is 104F....that's pretty fuckin brutal.
Nah, just depends like what This Guy said, what you grew up with and what you are used too.
I'll never forget once, in Kindergarten it was about 47C and the teachers started handing out ice cream to cool us off, it was really random.