Also in America you can find a relative of the redback... the Black Widow.
I once read an article on a guy who imported a car form the states and got one of these as a bonus... No one dared to even touch the car, so driving it was pretty impossible... It ended with him saying that they were going to try and freeze tha car down, since black widdows don't like cold (as you said, Seth).
Übereil
If you study spiders you'll note that a death by a Black Widow bite is very rare.
Only those who are allergic to them have severe reactions.
Usually all one experiences is very bad muscle cramps in their back.
The Black Widow is nothing close, not even by a fraction, to the deadliness of a RedBack.
Tsel
