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There are native placental mammals in Australia. These include some 80 species of bats, and dozens of rodents, including hopping mice of various species, tree rats, rock rats and other native rats, just to name a few.

Australian animals are also extremely vulnerable to introduced species. Many have become extinct due to introduced predators such as foxes, dogs and feral cats, while introduced herbivores such as rabbits and stock animals have caused an imbalance in the vegetation in Australia, threaten food supplies on which native animals rely.

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Q: Why aren't there native placental mammals on Australia also Why should Australian animals be vulnerable to alien species like island animals are?
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