Zarbi was the language of the Zarbi. (COMIC: The Macrobe Menace) They communicated by screeching and rubbing their legs together. (TV: The Web Planet) Much like bees, Zarbi also communicated by dancing. (COMIC: The Macrobe Menace)
According to the Eleventh Doctor, the TARDIS's translation circuits had trouble translating insectoid languages like Zarbi. (AUDIO: Paradise Lost)
In the year 5 billion, the University of Rago Rago 56 Rago had a copy of How to Speak Zarbi in 10,000 Steps, but it was found to be boring and was planned to be destroyed. (COMIC: The Macrobe Menace)