Here is one of the Joker cards for the Endangered Ark card deck ( [link] ). He's in your outback, eating your numbats.

Taking second place to feral house cats, the red fox is one of Australia's most problematic invasive predator. They were originally brought over in 1855 from Europe for the purpose of recreational hunting. Since then, their numbers have exploded, estimated around 7 million animals. They are responsible for the decline of many small marsupials, including the numbat. The fox is a very adaptable, elusive and prolific animal, and as such, is nearly impossible to contain or control. It continues to decimate populations of native species and there is no foreseeable solution.