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?

Rottnest

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.