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Not to speak of rabbits…

And camels

And foxes

And bumblebees

Yeah, but there's a fence for them.

This is a good point. Humans have a long history of deliberately introducing invasive species to control pests, and it almost always ends in disaster.

Cane toads are introduced. Are you telling me Australia has no ants?

All ants aren't native to all areas. This article is talking about transplanting weaver ant nests (which are native to tropical areas) from one area to another. The risks are still there.

You can't take fruit between some areas in Australia because of the risk of fruit flies - I wouldn't be so quick to write off the possibility that certain species of ants might carry a similar risk. Northern Queensland certainly has some nasty ants that we don't have in the more southern states.