Appendix S2. Experimental enclosures for the gray mouse lemurs.

Appendix S3. Video sequence of two playbacks in the discrimination playback experiment.

Appendix S4. Bandwidths and thresholds 3, 6, and 10 dB below the peak-frequency of the amplitude spectrum of 94 rustling sounds of 17 different beetle- and cockroach-species.

Appendix S5. Discrimination playback experiment: Decisions and statistics of the training phase 6 in which all stimuli-pairs were presented in a random order.

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