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The marsupial family Potoroidae includes the bettongs, potoroos and two of the rat-kangaroos. All are small, brown, jumping marsupials and resemble a large rodent or a very small wallaby. The potoroids are, like nearly all diprotodonts, herbivorous. However, while they take a wide variety of vegetable foods, most have a particular taste for the fruiting bodies of fungi, and often depend on fungi to see them through periods when there is little else to eat in the dry Australian bush. One example of a potoroo that sustains itself on fungi is the Long-footed Potoroo. This animal's diet is almost entirely made up of fungal spores. This limits its habitat range as it needs to live in a moist environment, with dense cover to reduce predation from introduced species such as foxes and feral cats. There are four species of bettong: including the Northern Bettong (Bettongia tropica) and the Eastern Bettong (Bettongia gaimadi). Bettongs were endangered because settlers took much of their habitat and the foxes they introduced to the island also killed many of them. At one time, both species lived all over Australia. But today, the Tasmanian Bettong lives only in the eastern half of Tasmania, and the Northern Bettong lives only in three isolated populations in northern Queensland.
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