The most common call is similar to the 'cackle' of the peregrine falcon but is slower and deeper – . The guttural call is shorter and more rapid when being attacked or when intruders are nearby – . Some authors suggest the bird screams when attacking prey but this attribution could be a result of misidentifications of brown falcons, with other authors contesting that the birds are generally silent during attack. The male also makes a sharp, rather high-pitched or during courtship displays, and the female has a whine or wail when begging for food or copulating.
