Killing cats to restore island backfires as rabbits take over
Attempt to Control Invasive Species Backfires Spectacularly on an Antarctic Island
Update:
In February 2012, The Australian reported that rabbits, rats and mice had been nearly eradicated from the island.[26]
By April 2012, the hunting teams had located and exterminated 13 rabbits still surviving since the baiting in 2011. The last five rabbits found were in November 2011, including a lactating doe and four kittens. No fresh rabbit sign has been found since. A fresh hunting team arrived on the island in April 2012 to continue the search for the last few survivors.
http://en.wikipedia.org/wiki/Macquarie_Island