 The volume of their calls is low, so only heard nearby, and the communication at the nest site is very soft.Immelmann described the species' identity call as a drawn out "oowee" with a ventriloquial character that disguises its location.This call is delivered with little evident movement, except at the throat, and the bird assumes a pose with the head held up, a little forward, and the bill closed or only slightly parted; it may be delivered once or up to twenty times in succession.