Identification of the caller’s sex from simulated datasets.

The difference between male and female simulated mean peak frequencies (Δ) was between 1 and 5 kHz. The number of calls per dataset ranged from N = 25 to N = 1000. Values presented correspond to the percentage (mean and sd) of individuals assigned to the correct sex out of 9,000 simulations (1000 simulations per considered proportion of males going from 0.1 to 0.9 in steps of 0.1). The percentage of calls within the overlap zone between sexes is also presented as a measure of overlap (mean and sd).