Yes they did.
No. Australia has very strict laws about the introduction of exotic species which could cause damage to the environment and prey on native fauna. Too much damage has already been done by species that were introduced in the colonial years.
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The cane toad. Rabbits have eroded and de-nuded large areas of Australia. Foxes also kill the native fauna. Starlings and Indian Mynahs displace the native birds.
Flora refers to the plant life in an area, and fauna refers to the animal life. The Flora in most of Australia is made to live in hot and humid temperatures. The fauna varies wildly, from kangaroos to giant spiders.
Feral camels in Central Australia have adapted so well to this arid environment that estimates range up to one million camels in the wild. Unfortunately this healthy breeding population comes at a devistating cost on the arid ecosystem - and has resulted in the critical endangerment of some already endangered flora and fauna (e.g. Desert Quondong).
Unique and totally protected.
Australia has been isolated for about 50 million years.
An emu is a large flightless bird. It lives in New Zealand and Australia.
Because Australia was separated from the rest of the world so all of the flora and fauna in Australia continued to grow only in Australia.
The Southern Hairy-nosed Wombat was chosen for South Australia's faunal emblem because they are almost unique to South Australia.
Not even remotely. Apart from the fact that Austria is in the northern hemisphere and Australia is in the southern hemisphere, there are huge differences in size, landscape, flora and fauna.
Australia does not have any official national faunal symbols. Most of the state and territories have adopted faunal symbols, but the country as a whole has no faunal emblem.