The quokka the only member of the genus Setonix, is a small macropod about the size of a domestic cat. Like other marsupials in the macropod family (such as the kangaroos and wallabies), the quokka is herbivorous and mainly nocturnal.
It can be found on some smaller islands off the coast of Western Australia, in particular on Rottnest Island just off Perth and Bald Island near Albany. A small mainland colony exists in the protected area of Two Peoples Bay Nature Reserve, where they co-exist with Gilbert's potoroo. The quokka was one of the first Australian mammals seen by Europeans.
The Dutch mariner Samuel Volckertzoon wrote of sighting “a wild cat” on Rottnest Island in 1658. In 1696, Willem de Vlamingh mistook them for giant rats and named the island "Rotte nest", which comes from the Dutch words rattennest meaning “rat nest”. The word quokka is derived from a Nyungar word, which was probably gwaga.