The quokka, "Setonix brachyurus", is a small marsupial about the size of a large cat. Like other animals in the macropod family, such as kangaroos and wallabies, the quokka eats grass and small plants, and is mainly nocturnal. It lives on some small islands off the coast of Western Australia, mainly on Rottnest Island near Perth, and Bald Island near Albany. A small number live on the main land in the protected area of Two Peoples Bay, which they share with Gilbert's Potoroo. The quokka is the only member of the genus "Setonix".