Australasian realm
The Australasian continental plate was once attached to Antarctica as part of the Gondwana supercontinent. The peculiarity of its flora and fauna is due to its long separation from the rest of the world. Apart from some birds, and until recent introductions by man, the native life had been undisturbed by invasions. The ecozone has the only two living monotremes, and has no native eutherian mammals.