Based on the Skippy epsiodes I've seen (and all a very long time ago), your average real Kangaroo can't go 'click click click' and be interpreted by The Boy as 'What's that Skip? There's been a car accident? Someone's badly injured, and someone else has a broken arm, and they're all lying just beyond that ridge?'
But having not lived out in the bush, I might be wrong. :)