Ulmar Grafe, T. Preininger, Doris Sztatecsny, Marc Kasah, Rosli Maximilian Dehling, J. Proksch, Sebastian Hödl, Walter Characteristics of the advertisement call of <i>Staurois parvus</i> and its acoustic environment. <p>(A) Oscillogram and spectrogram of a representative advertisement call with 34 notes. (B) Power spectrum of the same recording showing the energy contained in the ambient noise produced by the fast-flowing stream at which males called. The peak at 5500 Hz represents the advertisement call of <i>S. parvus</i>.</p> advertisement;acoustic 2013-02-20
    https://plos.figshare.com/articles/figure/_Characteristics_of_the_advertisement_call_of_Staurois_parvus_and_its_acoustic_environment_/304071
10.1371/journal.pone.0037965.g002