Man, you only have to go 15kms out of the CBD here in Melb along any of the trails at dawn or dusk and you'll be cruizing past 'Roos. I've seen Kangaroos at Westerfolds Park and heck, even a Wallaby and an Echidna in Keilor of all places.
Nature will find a way, as they say.
Oh, hey, shouldn't there be some compulsory road bike stuff in this thread soon? I was riding my mountainbike when I saw the 'Roos, so that doesn't count.