You know, the Greens are - I like to call them, you know, a pack of wolves in koala costumes-- Janet Albrechtsen
Now, presumably this is an allusion to the expression 'wolves in sheep's clothing'. Otherwise it wouldn't make any sense.
So: vicious destructive ferocious creature dresses up as innocent harmless ditto. So far so good.
But wait. The point of the wolf in the sheep's clothing is to pretend to be a sheep. Why does it pretend to be a sheep? So that it can fool the shepherd and get up close and personal with the sheep, unsuspected of being a wolf; maybe it can even get penned in with the sheep, so that in the dead of night it can unmask its wild and ferocious muzzle and midnight feast on leg o' lamb to its wild and ferocious heart's content.
That is the point, if you are a wolf, of dressing up as a sheep.
So. The Greens dress up as koalas so that they can fool ... um ... the koala shepherds.
They do this because they ... ahrrm ... want to eat the koalas.
A Green. As you can see, they are intellectual ay-leets as well as wolves. Approach with extreme caution, or, better still, not at all.
UPDATE: On the other hand, if this is a real koala then it is a koala in academics' clothing. Some of you had better run for your lives.