On another subject (not evolution):
Doesn't Australia have a long history of bringing in outside species to "solve problems", and then the outsiders themselves end up becoming a new problem?
Yep.
http://rubens.anu.edu.au/student.projects/rabbits/wildanim.html
There are now many animals living in Australia that have been deliberately introduced to the wild. Some came by accident, others were escapees from aviaries, aquaria and zoos. They were introduced for a number of reasons that now may sound quaint or impractical. It is a good history lesson to examine past introductions so that the same mistakes are not repeated in the future.
When populations of domestic animals such as livestock or household pets become established in the wild they are called feral animals. These include the feral cats, feral pigs, the hare, feral goats, and feral horse or brumby. However, the introduced species that did not originate from domestic livestock are referred to as exotics, exotic wild animals or introduced wild animals. Here are some reasons why these wild animals from other countries were introduced into Australia and just a few example of the species involved:
Biological control - cane toad, English starling, sparrow, mosquitofish
Sport hunting - rabbit, fox, deer
Fishing - trout, carp
Practical use - ostrich, camel, buffalo
Ornamental - blackbird, song thrush
Accidental - two species of rat, house mouse, European wasp, cattle tick
Escapees - Indian Palm squirrel, goldfinch.
Yeh, it started with the English.