For the uninitiated
Drop Bear - Australian Museum
There are many legendary animals in Australia some resemble the Yeti or Sasquash of other continents, others a leopard or panther but the most enduring and never seen until now is the drop bear and surprise, surprise, he was found in south australia just as the article predicts. The Koala is not a cuddly teddy bear but a powerful animal capable of inflicting nasty wounds if angered. All wild Koalas should be avoided
Why would he pursue a quad bike, well I suspect the bike was moving too fast and not to be done out of lunch... or perhaps the engine just annoyed him. Did you watch the video or just look at the picture? Then again he might have been out for his morning ride and fell off!