The koala, although expensive, is probably a good idea. There are parts of Victoria where the Koala population is so concentrated they are eating themselves to death. The land in the area has been cleared to such an extent that they are all forced into these little pockets. Local rangers want to do a cull to protect the trees and otherwild life (they kill the trees by over feeding) but they are stopped by wildlife groups say that they should be relocated and more trees should be planted.

IMHO they should cull and plant trees. Both a short term and long term solution.