RE: Red foxes (Vulpes vulpes) were introduced to Australia for sport hunting in the 19th century, but ended up being responsible for the extinction of several native species, including the desert rat-kangaroo (Caloprymnus campestris)

[valth]

Yep, this is what we get when we interrupt the natural ecosystems that have evolved over a long period of time. It's best to not interrupt these anymore than we absolutely have to. And I agree with the poison, it's far from the best solution!