The chief, whose title is Rana, is a Rajput of the Sisodhyia clan, connected with the Udaipur family.
In some species of Rana and Staurois inhabiting mountainous districts in south-eastern Asia, the larvae are adapted for life in torrents, being provided with a circular adhesive disk on the ventral surface behind the mouth, by means of which they are able to anchor themselves to stones.
The paca-rana (Dinomys branicki), from the highlands of Peru, differs, among other features, by its well-developed tail and the arrangement of the spots.
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.
Goeldi states that the paca-rana is a rodent of phlegmatic and gentle disposition,.