When I saw this photo online a few days ago, I thought, "that koala looks pretty vicious." It didn't occur to me that the image might be fake.
But the reality, I now know, is that the image is fake. Koalas don't have wolf-life jaws.
The original photo (below) was taken in January 2009 by Flickr user Oz_drdolittle, who explains that the koala was wet because he had sprayed it with water:
I don't know who added the wolf fangs to the picture. Link: NowPublic.com