The Gekkonidae are the only lizards with true vocal abilities and of this group the southern African genus Ptenopus is probably one of the most vociferous. The call consists of a series of clicks, ticks or chirps, which are uttered in quick succession. Calls are usually uttered in reply to others, for which reason the type species was called Ptenopus garrulus. Keywords: Barking geckos, Gekkonidaee, Reptilia.