As others have said, most Australian snakes are poisonous, many of them dangerously so. Of course, the important thing is how common the poisonous ones are, not how many species are poisonous. Unfortunately, the most common snakes in most of Australia are among the most dangerous - Brown, Tiger, Death Adder. The relatively common red bellied black is less dangerous - but many Brown snakes are almost black.
Two of my close relatives (my twin and a nephew) have been bitten by snakes as small children and in neither case were they interfering with the snake. Both recovered with prompt treatment, and neither snake was caught or positively identified. (useful to specify which antivenene to use).
Both cases were within twenty feet of a house.
