Appendix S1. Details of the microphone arrays and additional analyses.

Fig. S1. Sound spectrograms showing examples of the sounds played back and recorded with a portable, wireless acoustic location system.

Fig. S2. Examples of the graphical output of ArrayGUI triangulation software, showing both reliable and unreliable location estimates.

Fig. S3. Photographs of GPS-enabled Song Meters used as a wireless microphone array.

Fig. S4. Maps of loudspeaker and microphone positions for the twelve deployments of the wireless microphone array.

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