Red foxes in Australia

Red foxes pose a serious conservation problem in Australia. Current estimates indicate that there are more than 6.2 million red fox (Vulpes vulpes) and growing with a range extending throughout most of the continental mainland. The species became established in Australia through successive introductions by settlers in 1830s. Due to its rapid spread and ecological impact it has classified as one of the most damaging invasive species in Australia.

Red Foxes were introduced to the British colonies of Van Diemen's Land (as early as 1833) and the Port Phillip District and Sydney Regions of New South Wales (as early as 1845) for the purpose of the traditional English sport of fox hunting. Curiously a permanent fox population was not established on the island of Tasmania and it is widely held that they were outcompeted by the Tasmanian devil. On the mainland, however, the species was successful as an apex predator. The spread of red foxes across the southern part of the continent has coincided with the spread of rabbits in Australia, another invasive species also introduced in the 19th century that is a key prey of the red fox.

Established populations of red fox are found in all states except Tasmania and it is widespread throughout the country with the exception of tropical areas of northern Queensland, the Kimberley and the Top End of the Northern Territory. From 2010, confirmed evidence of foxes in Tasmania has been reported by the state's Department of Primary Industries, Parks, Water and Environment.

It is generally less common in areas where the dingo is more prevalent; however, it has, primarily through its burrowing behaviour, achieved niche differentiation with both the feral dog and the feral cat.

The West Australian conservation department, CALM, estimates introduced predators are responsible for the extinction of ten native species in that state.

...
Wikipedia