The Japanese dwarf flying squirrel (Pteromys momonga; Japanese: ニホンモモンガ; Hepburn: Nihon momonga) is one of two species of Old World flying squirrels. It is native to Japan where is inhabits sub-alpine forests and boreal evergreen forests on Honshu and Kyushu islands. It grows to a length of 20 cm (8 in) and has a membrane connecting its wrists and ankles which enables it to glide from tree to tree. During the day this squirrel hides in a hole, usually in a coniferous tree, emerging at night to feed on buds, leaves, bark, fruits and seeds. This squirrel faces no particular threats, has a wide range and is relatively common, and the International Union for Conservation of Nature lists it as a "least-concern species".