A highly arboreal and active species, at night the long-tailed climbing mouse runs along branches and twigs, even climbing vertical shoots, to forage for a variety of fruits and buds (1) (2). Whilst feeding, this diminutive species may loosely wind its long tail around a branch as a balancing aid, or hang from it to reach food sources on fragile twigs (1) (2) (3). During the day the long-tailed climbing mouse seeks shelter in tree holes or nests high up in the canopy. Pairs nest between October and February and will descend to the ground to collect grass and leaves to construct a shallow, oval shaped nest in the fork of a tree (1) (2). As is typical of many small mice species, three or four young are born after a gestation period of 20 to 30 days, with a life expectancy of little more than one year (2) (5).