Meekatharra had an electric fence all round the airport when I was there. Every so often, during leisurely runway inspections, you'd see a roo with his head through the fence eating the grass on our side (which looked the same as the stuff on his side) when the fence would zap him. Usual result was an involuntary boing from the roo which left him bewildered on the aiport side, and quite disinclined to approach the fence again.
We'd chase them with the Golden Holden until they jumped back over. Yes, fences work real well with roos.
I don't suppose Kerry got rich by just paying for things tho, I hear he pays less tax than I do.