The montane guinea pig is a cavy of the Andes and surrounding areas. Its back is gray-brown, and it uses burrows in grassland and damp rocky places.
The back is gray-brown and mottled, while the underside is pale. Coat color varies across regions.
It is active around dusk and at night, and uses burrows that it digs or that other animals have left. It eats plants such as grasses.
An extinction-risk assessment has not been added yet.