The rich acoustic repertoire of a precocious rodent, the wild cavy Cavia aperea

The Caviomorph rodents have precocious young and vary in social complexity, resorting to acoustic communication to efficiently regulate social interactions intra-group and to avoid intruders and predators. The wild cavy Cavia aperea, one of the species with the largest geographic distribution, is considered a wild representative of the domestic Cavia porcellus, a species with a remarkable acoustic repertoire. We conducted a descriptive study on the acoustic behaviour of a captive population of C. aperea. We observed animals in groups, in pairs and isolated pups, and conducted sonographic and descriptive analyses. Ten distinct call types were identified: teeth-chattering, structurally variable contact calls, whines and squeals, a scream, alarm whistle, almost exclusive pup-isolation whistle and tweet calls, and the previously described alarm drrr and courtship purr calls. As in other caviomorphs, some of these signals may carry information about specific contexts and moods and others may communicate arousa...