The vocalisations of the two martins are quite different. Mascarene martin has a warbled "siri-liri siri-liri" song given in flight or when perched; some calls given by perched birds end in a glissando. Other vocalisations may be used during mating or displays of aggression. There is a "chip" contact call, and the young birds produce a fast twittering sound when begging for food. Birds wintering in mainland Africa are usually silent. The song of Brazza's martin consists of a series of short notes increasing in frequency which are followed by a complex buzz and sometimes completed by a number of clicks. The song becomes increasingly loud, although the final clicks are quite soft. The song is similar to that of the banded martin, and does not resemble that of the Mascarene martin, suggesting unresolved taxonomic problems.