Generally quiet and unobtrusive while foraging. Calls include a moderate-pitched keek! or eek!, a seep in flight (Parker 1976) and a high-pitched plaintive whistle ssit ssit ssit or sseet sseet (George 1964, Isler and Isler 1999). Song includes a rapidly delivered series of whispy whistles, squeaky cheeps and sharp chip notes: whip-whee-which-chit, ti-chip ti-whit-ti, whip-whee-wit etc. Song sounds similar to closely related Conirostrum species.