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Calls of Ctenodactylus gundi living in semi-natural conditions in our laboratory were recorded during various interactions : sexual, agonistic, maternal. The physical characteristics of the sounds lead us to describe five major structural groups and eleven vocal types. Two of them were recorded only in young animals. Intermediate calls and some complex sequences formed by association of two vocal types were observed. When emitting sounds, adult gundis can produce eight vocal sequences. In two of these phrases a constant association of two different calls can be shown. Seven sequences can be related to one of three kinds of social interactions : sexual intercourse, withdrawal or aggressivity. In each,vocal types are arranged in a gradual order based on the intensity of the interaction. The alarm call and two calls produced by young gundis when interacting with their mother must be added to the seven sequences described above. Gundi's calls appear then to be related both to the quality of social interactions and to the degree of arousal of the emitter. Functional problems are discussed and compared with available data from some other Rodents.