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Is a diminutive marsupial native only to southwestern South America (Chile and Argentina). It is the only extant species in the ancient order Microbiotheria, and the sole New World representative of the superorder Australidelphia (all other New World marsupials are members of Ameridelphia). The species is nocturnal and arboreal, and lives in thickets of South American mountain bamboo in the Valdivian temperate rain forests of the southern Andes,aided by its partially prehensile tail. It eats primarily insects and other small invertebrates, supplemented with fruit.
Monitos del monte mainly live in trees, where they construct spherical nests of water resistant colihue leaves. These leaves are then lined with moss or grass, and placed in well protected areas of the tree. The nests are sometimes covered with grey moss as a form of camouflage. These nests provide the monito del monte with some protection from the cold, both when it is active and when it hibernates. It stores fat in the base of its tail for winter hibernation. It lives in the dense, humid forests of highland Chile and Argentina.
Body length is 11–12.5 cm. Tail length is 9–10 cm.