The quoll began to decline in number after 1770 in correlation with immigration to Australia. Over the years the influx of immigrants and development contributed to habitat loss. In addition to this immigrants brought new animals to Australia like foxes, dogs, and cats. These animals preyed on the quoll, brought new diseases, and competed with quoll for food.
Northern Quoll populations have declined for various reasons, such as changed fire patterns and hunting by feral cats. The rapid decrease in recent years has been due to the spread of the cane toad into areas where Northern Quolls live. Cane toads were brought to Australia in 1935 to control a beetle in cane fields. Quolls fed on them without knowing that they are deadly poisoness to them.
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