The Northern Viscacha (Lagidium peruanum) is known from Peru and Chile, at elevations from 300 to 5000 m, and may also be present in Bolivia.
Its long ears are furry and its body fur is dense and soft, but the tail has coarser hairs. The dorsal (upper) surface ranges from dark grey at lower altitudes to brown at higher elevations. The ventral (under) surface is cream or pale grey and the tip of the tail is reddish-brown or black. The northern viscacha is a herbivore and feeds on a variety of plant material, including grasses, roots, and seeds. Breeding usually takes place during October and November.