The swiftlets utter twittering and chirping sounds as well as the echolocation clicks used to navigate inside the nesting and roosting caves.
Northern Mariana Islands | Mariana Islands | Mariana | Picea mariana | Mariana Pimentel | Mariana of Austria | Mariana Codruţ | Mariana Victoria of Spain | Mariana and Palau Islands campaign | Edible-nest Swiftlet | United States House of Representatives election in the Northern Mariana Islands, 2010 | Republican Party (Northern Mariana Islands) | Northern Mariana Islands' At-large congressional district | Mariana Valverde | Mariana Trench | Mariana Seoane | Mariana Renata | Mariana, Minas Gerais | Mariana Levy | Mariana Grajales Airport | Mariana González Oliva | Mariana Frenk-Westheim | Mariana de Aguirre | Maria Mariana | Japanese air attacks on the Mariana Islands | Izu-Bonin-Mariana Arc | Doña Mariana and Don Antonio Coronel, from a photo published in the ''Overland Monthly | Black-nest Swiftlet |