Behaviour of domestic guinea pigs and wild cavies in two tests on social behaviour during early and late adolescence. (A): time spent in contact to an unfamiliar infant in a male vs. infant interaction test. (B): frequency of courtship behaviour shown towards an unfamiliar female in a male vs. female interaction test. Bar charts represent medians and “X”s represent single individuals. NDomestic = 10, NWild = 8; * = p ≤ 0.05; ** = p ≤ 0.01.