Octodontomys

The mountain degu (Octodontomys gliroides), also known as the Andean degu, is a species of rodent in the family Octodontidae. It is the only species in the genus Octodontomys. It is a medium-sized rodent with long, silky grey-brown fur, large grey ears, and white-furred chin and underparts. It is found in the foothills of the Andes in Argentina, Bolivia and Chile, and closely resembles the mountain viscacha rat and viscacha rats in the genus Tympanoctomys, all of which are found in Argentina. It is an herbivore, and eats grasses, leaves, bark, and cacti. The mountain degu gets most of its water from eating the tissues of prickly pear cactuses and cactuses in the genus Cereus.

The mountain degu is a social animal, though not as much as the related common degu, and lives in family units of two to four individuals that share a burrow, play together, and take dust baths in turn with each other. Mountain degus have no special ability to dig with their claws, and their burrows are often short. They often make their homes in caves and under rocks. Members of a social group communicate through gurgles, twitters and squeaks. The mountain degu's closest relatives are the rodents in the genera Octodon, Spalacopus, and Aconaemys.