The family Pseudocheiridae consists of arboreal marsupial mammals commonly known as ringtail possums and their relatives, primarily found in Australia and New Guinea. Members of this family are nocturnal herbivores, feeding mainly on leaves, fruits, and flowers, and they possess a prehensile tail that aids in climbing and balancing in trees. Pseudocheirids have a well-developed cecum for fermenting fibrous plant material, reflecting their folivorous diet. They are generally small to medium-sized, with soft fur and large, forward-facing eyes adapted for night vision. Social structures vary, with some species living in family groups, while others are largely solitary. Their arboreal lifestyle and specialized diet make them important components of forest ecosystems, but many species face threats from habitat loss and predation.