Actually Goldy koalas are notoriously picky about habitat. There are only something like 5 different species of gum tree they actually eat. And as far as I know, New Zealand doesn't have any gum trees. So no those koalas would head across and die within twelve years.
On the other hand wombats are the most underestimated animal on the face of the earth. I mean they don't look at all vicious. They're like dog-sized, vegetarian bears that waddle around. And occasionally bite people's kneecaps. Look up wombat attack on Youtube and you'll see what I mean. They charge people.
As far as reply goes, I stand by, the Texas military is no match for my atomic, kamikaze wombat army.