On the other hand.Go to Tasmania now, you can find antler everywhere. Deer are in plague proportion at the moment.
It's amazing how few people have completely buggered up the Australian ecosystem. Thomas Austin and Reginald Mungomery to name a few.
I remember reading that having introduced camels into Australia for whatever reason, they found they were obliged to introduce Arabian dung beetles because Australian dung beetles didn't recognise camel dung and were needed to tidy up.