Vocalizations emitted in a uniform distress situation were recorded from adult, similarly sized, gekkonine lizards Bunopus blanfordii, Cyrtodactylus kotschyi orientalis, Gehyra variegataand Stenodactylus s. sthenodactylus. The 269 calls obtained from the 24 individuals used, analysed sonagraphically, segregated into four distinct call types recurring in each species. Ten independently varying factors combine to make this repertoire extremely variable. This variation is independent of the acoustic environment. Because the vocal response to an attacking predator is so unpredictable, and because the acoustic frequency range transcends the hearing range of the geckos themselves, the calls are believed to have a deimatic, anti-predator, function.