20 million is probably a low estimate. I have previously worked with a farm owner to cull wild dogs (not dingos, mainly large dog breeds that went rogue). They

20 million is probably a low estimate. I have previously worked with a farm owner to cull wild dogs (not dingos, mainly large dog breeds that went rogue). They attacked livestock so the owners had an economic need for getting rid of them. In a fairly small area of 500 acres (2km^2) there were around 30 dogs. Australia is a massive country. I am a cat person but I can't see how allowing feral cats to drive even more species to extinction is a good thing. The moral argument falls unstuck when you think that cats lives, which are common, geographically safe and domesticated, are more important than hundreds of species which will be extinct if steps are not taken to correct the balance. Some small mammals are primary pollinators in Australia too so you are then also looking at plant species becoming extinct too.