out on the Nullabar Plains where the big Red Roos live I have seen a car written off after hitting one, and it is not uncommon to hit a big grey (more common around coastal regions) to hit a car with a glancing blow and cause quite some damage get up and hop away, hit a roo on a bike and you go and buy a lottery ticket if you don't go down the road big time. Then we have the Wombats hit one of them and they will do some serious damage they have been known to take out a front wheel of a semi trailer truck, they are like hitting a big rock,... solid as one too