Could it be possible...
I'm imagining a team of scientists, many years hence, discovering that the many dangerous, aggressive, venomous, poisonous, etc. etc. creatures in Australia serve soft of as antibodies against foreign invaders. Ok, clearly science fiction, but would explain the abundance of nasty critters.
If true, keep an eye out for new species - something that behaves extremely aggressively toward anything producing EM radiation (and anything near that)...