Where are the 'roos?

One of my goals in Australia was to see a bunch of kangaroos bounding across the open plain. Unfortunately, that hasn't happened. Besides one solitary one I saw standing by the roadside, I've only seen roos in 3 places: 1) at the animal farm we went to (but they weren't bounding in open plains there); 2) on the menu; and 3) splattered (scores of them) on the road. A bit disappointing.