Setonix brachyurus, commonly known as the quokka, is a small marsupial native to Australia, particularly found on Rottnest Island and parts of the mainland. Quokkas are noted for their friendly demeanor, often described as having a 'smile.' They are herbivorous, nocturnal, and have a short, muscular tail. These social animals live in groups and play a crucial role in seed dispersal within their ecosystem.

Setonix brachyurus, commonly known as the quokka, is native to the southwestern region of Australia. It is primarily found on a few small islands off the coast of Western Australia, including Rottnest Island and Bald Island. Additionally, there are some populations in mainland Western Australia, particularly in the forests and coastal scrublands of the southwest.

Quokkas inhabit a variety of environments, but they are most commonly found in areas with dense vegetation that provides cover and access to water sources. On Rottnest Island, they are often found in shrublands and heathlands with sandy soils. The climate of these regions is Mediterranean, characterized by wet winters and dry, hot summers.

Quokkas are herbivorous marsupials that primarily feed on grasses, leaves, and stems. They are well-adapted to survive in areas with seasonal water availability and rely on their ability to extract moisture from their food. Their role in the ecosystem includes seed dispersal, which helps maintain the health and diversity of their native habitats.