Examples for all different anuran advertisement call guilds (A–H), with a time scale of 0 to 1 s on x-axis and frequency scale of 0 to 8 kHz on y-axis (compare text). Guild A) non-frequency modulated, non-pulsed simple call (Bombina bombina; Bombinatoridae; dfrq/ms = 0.00 Hz/ms) (based on Schneider 2005); Guild B) frequency modulated, non-pulsed simple call (Leptodactylus fuscus; Leptodactylidae; dfrq/ms = 7.22 Hz/ms) (based on Márquez et al. 2002); Guild C) non-frequency modulated pulsed call (Hyla meridionalis; Hylidae; dfrq/ms = 0.67 Hz/ms) (based on Masó and Pijoan 2011); Guild D) frequency modulated pulsed call (Hyperolius pickersgilli; Hyperoliidae; dfrq/ms = 2.32 Hz/ms) (based on Du Preez and Carruthers 2009); Guild E) non-frequency modulated call with uniform notes (Sclerophrys mauritanica; Bufonidae; dfrq/ms = 0.31 Hz/ms) (based on Masó and Pijoan 2011); Guild F) frequency modulated call, with uniform notes (Pseudopaludicola boliviana; Leptodactylidae; dfrq/ms = 2.38 Hz/ms) (based on Márquez et al. 2002); Guild G) non-frequency modulated complex call (Smilisca sila; Hylidae; dfrq/m = 0.43 Hz/ms) (based on Ibanéz 1999); Guild H) frequency modulated complex call (Hyperolius nasutus; Hyperoliidae; dfrq/ms = 1.66 Hz/ms) (based on Du Preez and Carruthers 2009).