It is because of our early history - heavy with hubris - with introduction and escape/release of cane toads, prickly pair, tiger pear, rabbits, foxes, camels,

It is because of our early history - heavy with hubris - with introduction and escape/release of cane toads, prickly pair, tiger pear, rabbits, foxes, camels, fruit fly, etc ... that Australia is now extremely cautious.