The Japanese dormouse (Glirulus japonicus) is a species of rodent in the family Gliridae endemic to Japan.

Among dormice, it has the special ability of running at great speed upside down, suspended from branches.

Its main food is fruit, insects, berries, nuts, and even flowers.

It tends to inhabit arboreal nesting sites to avoid interspecific competition with the small Japanese field mouse (Apodemus argenteus) because of their sympatric relationship.

[6] Japanese dormice are omnivores and have a diet mainly consisting of fruits, berries, nuts, insects, and even flowers.