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In summary, most authors agree that the introduction of exotic predators, especially the European Red Fox (Vulpes vulpes) and Feral Cat (Felis catus), the introduction of exotic herbivores, especially the European Rabbit (Oryctolagus cuniculus), Sheep (Ovis aries) and Cattle (Bos taurus), and changed fire regimes, particularly in the arid grasslands, have contributed to the decline and extinction of an array of species in Australia.
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Land clearing has been the major factor in the demise of one species and the decline of others.
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In summary, it appears that the interaction of three factors changes to habitat caused by introduced herbivores, homogenisation of habitat following changed fire regimes and, particularly, the spread of exotic predators has been mainly responsible for the high extinction rate of marsupials since European settlement of Australia. Habitat clearing has also affected the extent of occurrence of many species.