It is a large rodent known to the Tupi Indians as the paca-rana, or false paca, in allusion to the resemblance of its coloration to that of the true paca, from which it differs by its elldeveloped tail, the absence of cheek-pouches, the full development of all five toes and the wider thorax.
The Tupi name may be adopted as the popular title of the species.
The common language of the country is Guarani, although in a few districts Tupi is spoken.
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