The Southern Screamer has a loud, unmelodious, double-noted trumpet call. These vocalizations have been described as "a "low, throaty, almost barking, brief 'oh-WOOOW' which also sounds sometimes as 'be-SERK' " (Belton 1984). The calls of the female are "weaker" (Sick 1993) or higher pitched than calls of males (Belton 1984).
Southern Screamers both when perched as well as in flight. Their calls reportedly can be audible for up to three km (Sick 1993).