Oscillograms showing two types of male airborne calls from three species of katydid (Insecta: Orthoptera: Tettigoniidae: Conocephalus), from Naskrecki (2000).  
  Part of: Egloff W, Agosti D, Kishor P, Patterson D, Miller J (2017) Copyright and the Use of Images as Biodiversity Data. Research Ideas and Outcomes 3: e12502. https://doi.org/10.3897/rio.3.e12502