Is the quokka found in only one part of Australia?
Yes. The quokka is only found on Rottnest Island, which is
situated off the southwestern coast of Australia, about 18 km from
Perth, the capital of Western Australia.
The quokka can also be found in the coastal plain around the
Swan River, near Perth and Gingin, on the mainalnd. It is also
found on Bald Island, and at Harvey and Collie in the Stirling
Ranges.