Description
The viscacha rat is a rat-like animal with a head-body length of 11 to 18 centimetres (4.3 to 7.1 in) and weighing from 85 to 121 grams (3.0 to 4.3 oz). The feet are relatively long, while the tail measures 12 to 16 centimetres (4.7 to 6.3 in). It has light brown fur with white underparts and a bushy tail.
Unusual features of the viscacha rat include greatly enlarged auditory bullae, and the presence of numerous whiskers on the roof of the mouth behind the incisor teeth. The exact function of the whiskers is unclear, but they may enable the animal to sense the position of food inside the mouth.
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