Which large Australian island is famous for being a sanctuary for endangered species such as the quokka, often described as the happiest animal in the world?

Fact

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Rottnest Island, located off the west coast of Australia, is famous for its smiling residents, the quokkas. These small marsupials, which always seem to be smiling, have become a major tourist attraction, although their population is vulnerable and limited to a few regions in Western Australia. Rottnest offers a unique glimpse of Australian wildlife and underscores the importance of conserving natural habitats for the survival of endemic species.