They're repulsive. There's a photo of my wife holding one from about 1996 and it looks like she's attached to some sort of zombie. Her response:

&gt;Yeah it was scratching at my boob, it was really funny haha!

If I had a koala scratching at *my* boob it would be the last thing it ever did. They're black-eyed monstrosities and they wouldn't be able to exist on any other continent because they're too stupid and too shit and too weird.

edit - oh good I just failed to follow your advice and looked up what one of them looks like when it's wet. Now I feel like I'm being stalked be a really shit version of the Predator.