Tous is a genus of marsupial in the family Pseudocheiridae endemic to New Guinea and Australia. It contains two named species, the ring-tailed glider T. ayamaruensis and T. stirtoni, both of which were originally described entirely based on fossils and presumed to be extinct. In the years following 2015, multiple sightings of T. ayamaruensis indicated it is still alive, making it a Lazarus species. Tous is characterized by the unique combination of both a strongly prehensile tail and a well-developed patagium. It is further distinguished from its closest relatives in the subfamily Hemibelideinae by its very small size, naked ears, ear ring, and non-bushy, tapering tail.