Oscillograms, audio spectrograms and power spectrograms of the “chuck” call of Leptopelis aubryi (ZFMK 89560) from Big Massaka, Cameroon (a) and Leptopelis spiritusnoctis from Taï National Park, Ivory Coast (b). This audio files are also available from the Tierstimmenarchiv at the Museum für Naturkunde, Berlin, through the following links: a) http://www.tierstimmenarchiv.de/recordings/Leptopelis_aubryi_DIG0174_01_short.mp3 (Suppl. material 2), b) http://www.tierstimmenarchiv.de/recordings/Leptopelis_spiritusnoctis_DIG0174_02_short.mp3 (Suppl. material 5).