There are no Earthworms native to Western Australia. However, the Giant Gippsland Earthworm is native to Victoria, Australia. Australia has some 1,000 native species of earthworm so it is relatively impossible where most of them were originally native too.
Correction:
An estimated 90% of the earthworm species in the Kimberley region of Western Australia are endemic to this region alone, particuarly within the small patches of rainforest.
Yes. The Western grey kangaroo is not found in any other country apart from Australia.
No rabbit of any kind is native to Australia.
There are no native species of any cat that live in Australia naturally.
No. There are no species of jacaranda native to Australia. The jacaranda came from South America.
Yes. There are many different species of kangaroos in Western Australia. Red kangaroos, in particular, are found throughout Western Australia.
No. Koalas are only found in the eastern states, excluding Tasmania. They have been introduced to southwest Western Australia in protected colonies there.
Western Australia has more land area than any of Australia's states or territories.
It is not legal to have a sloth as a pet in Western Australia, or in any other part of Australia.
You can't. There are no true native tortoises of any kind in Australia.
Yes. Platypuses are native to Australia, specifically the eastern half. They are endemic, meaning they are not found in any other country.
There are no volcanoes in Perth, Western Australia. This is because the mainland of Australia is not near any plate boundaries.
Yes. Under the Wildlife Conservation Act 1950 it is illegal to "take" (to kill or capture) any native fauna in Western Austrlalia, unless exempted by statute. You should call the local council to remove any snake you find on your property.