| Although it will eat any vegetation, seeds and grasses are preferred, which makes the viscacha a pest to ranchers, especially because the burrows are hazardous to both humans and livestock. |
| At the time, the nearest known relative of the plains viscacha rat was another viscacha rat, Octomys mimax, with fifty-six chromosomes. |
| Small deer, introduced hares, and viscacha, a burrowing rodent, are common. |
| Unlike mountain viscachas, the plains viscacha is nocturnal. |
| The guanaco, the viscacha, and the hare of the Pampas, are found in Patagonia. |
| Closely related to the chinchilla is the viscacha, which is found very abundantly in the great pampas districts of South America. |
