The Blue Dacnis has a call (http://macaulaylibrary.org/audio/16258) that is described as a high pitched tsit or sut and a harsh to moderate high pitched chit or chid-it (Isler and Isler 1987, Hilty et al. 2003). The Blue Dacnis song (http://macaulaylibrary.org/audio/73486) is a series of high pitched chit notes. The song (https://www.xeno-canto.org/247733) has also been described as being a weak warble (Sick 1993). The alarm call of the Blue Dacnis consists of a sharp tsit that is repeated once every one to two seconds (https://www.xeno-canto.org/164083). Other sounds that have been reported include a male Blue Dacnis making a slight weak lisping noise for about a minute (Skutch 1962). Blue Dacnis have been described as not very vocal, only making an occasional tsit (Ridgely 1946). Additional audio recordings of Dacnis Cayana can be heard at Macaulay Library (http://macaulaylibrary.org/search?taxon=Dacnis%20cayana&taxon_id=12000159&taxon_rank_id=67&tab=audio) and at xeno-canto (https://www.xeno-canto.org/species/Dacnis-cayana).