Monticolomys

The Malagasy mountain mouse or Koopman's montane voalavo (Monticolomys koopmani) is a rodent in the subfamily Nesomyinae of the family Nesomyidae. It is monotypic within the genus Monticolomys, and is closely related to the big-footed mouse (Macrotarsomys). It is found in the highlands of eastern Madagascar. This small, mouse-like rodent is dark brown on its upperparts and dark gray on its underparts. It has small, rounded, densely haired ears and broad feet with well-developed pads. The long tail lacks a tuft at the tip. The skull is delicate and lacks crests and ridges on its roof.

First collected in 1929, the Malagasy mountain mouse was not formally described until 1996, but it is now known to have a broad distribution. Active during the night, it occurs in both montane forest and human-disturbed grasslands and feeds on fruits and seeds. A scansorial animal, it climbs trees but also lives on the ground. Although habitat destruction may pose a threat, it is classified as "Least Concern" on the IUCN Red List.