Although inland Australia has never been exactly verdant, much of the marginal land once experiences periods of relative lushness, sometimes lasting years, occasionally lasting decades, and it enjoyed a natural resiliency that let it spring back after droughts. Then in 1859 a man named Thomas Austin, a landowner in Winchelsea, Victoria, a little south of where I was now, made a big mistake. He imported twenty-four wild rabbits from England and released them into the bush for sport. It is hardly a novel observation that rabbits breed with a certain keenness. Within a couple of years they had entirely overrun Austin's property and were spreading into neighbouring districts. Fifty million years of isolation had left Australia without a single predator able even to recognize rabbits, much less dine off them, and so they proliferated amazingly.
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The rabbits ate so much of everything that sheep and other livestock were forced to extend both their range and their diet, punishing yet wider expanses. As sheep yields fell, farmers perversely compensated by increasing stocking levels, adding to the general devastation.
The problem would have been acute enough, but in the 1890's, after forty unusually green years, Australia fell into a murderous, decade-long drought - the worst in its recorded history. [...]
The rabbits, meanwhile, hopped on. By the time science finally came up with a solution, almost a century had passed since Thomas Austin tipped his twenty-four bunnies out of the bag. The weapon deployed against the rabbits was a miracle virus from South America called myxomatosis. Harmless to humans and other animals, it was phenomenally devastating to rabbits, with a mortality rate of 99.9 per cent. Almost at once the countryside filled with twitching, stumbling, very sick rabbits and then with tens of millions of little corpses. Although just one rabbit in a thousand survived, those few that did were naturally resistant to myxomatosis, and it was resistant genes that they passed on when they began to breed again. It took a while for things to get rolling, but today Australia's rabbit numbers are back up to 300 million and climbing fast.
At all events, the damage of the landscape, much of it irreversible, had already been done. And all so some clown could have something to pot at from his veranda.
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