We got to go to a park outside of Darwin which had some Wallaby's and saltwater crocks. Don't recall seeing any kangaroo's there though. All the pickups and range rovers had hughe steel bumper they called roo catchers and everyone seemed to hate the "Big Red's". I guess they were a nuisance like deer are in the states.
I read some time back about a California resident who had a strange shaped back yard which prevented him from mowing a small narrow piece. He often let it grow and had neighbor complaints. When an inspector came, the resident claimed it was his "nature area" and that claim was accepted.