Australia's worst pests are the rabbits, introduced by a settler who released 24 into the wild for sport hunting. In less than 100 years, the rabbits grow into the millions of ones, leaving large areas of land looking like the surface of the moon due to thousands of rabbit caves. The spread   of the rabbits in Australia was the fastest of all animals in the world. The spread of the rabbits' disease in 1950 cut the number, but it was not until 1997 when the spread of another disease targeted   the pests that the number was finally brought under control. Farm losses due to rabbits today still remain a surprising total A $200 million (US$112 million) a year.       The European red foxes, also released for sport hunting, are growing and eating sheep flocks, costing farmers A$40 million (US $22.4 million) a year. The State of Victoria offers a A$10 (US$5.6) prize for each fox tail and has gathered 25,000 in a few months.      Foxes are one of the biggest threats to wildlife in Australia. Foxes kill thousands of lambs , birds and native wildlife. Australia lost its long battle against wild pests. What reduced the number of the rabbits?
Hunting Poisoning Disease Flood.