Sierra Madre tree-mouse

The Sierra Madre tree-mouse, Musseromys anacuao, is a small rodent in the family Muridae. It lives in the forest of the northern Sierra Madre on the island of Luzon in the Philippines, and it is known from only one location. Like the other members of the genus Musseromys, it is a small murid weighing between about 15 and 22 grams, with a tail that is usually longer than the rest of the body: the tail measures roughly 82 to 101 millimetres against a head and body of about 74 to 84 millimetres. The species is known from two adult specimens, a female that serves as the holotype and a male, both held in the collections of the Field Museum of Natural History. Because so little is known about its habitat and the threats it faces, the International Union for Conservation of Nature assesses it as Data Deficient.